THE AMERICAN ENTOMOLOGIST. 



163 



Neunition as in Crcssou's Figure 8, Trunx. Aim r. Knl . 

 Soc, I, p. 121.— Length cf 0.20— 0.2-2 incli 



The 2 differs from cJ only as follows: 1st. The body 

 is stouter. 2d. Tin- iIvikih i> widrlv roundiMl. not 

 truncate. Sd. Tin- jiarl- "!' Ilii' lirad liiiit air whilu in 

 rj" are black, but llir w liiir imlirMcnr,. ii'inaiiis there. 

 4th. The first ahdooiinal joint -well- .ml lia<kwards on 

 asudden near its ba-e, >.. that il- side- are not sliainlit 

 .'Hh. The last abdominal joint is on ils upjier surlaee 

 flattened, hi-hly polished and sli-hlly dished, but is 

 iininaenlate. (j'th. The legs are ' bUick iuunaeulate. 

 — Ix'ngth § 0.21—0.23 inch. 



Deseiihed from 10 (j" , 4 $ , Ijreil, exeei)t 2 captured (f , 

 from three different lots of clav-e,-lls (Ki^-. lo,'), <■). Of 

 the i;! U. S. AiienJa deserihed bv :\Ir, Cresson ill the ^ 

 se.K, but 4— viz: U\. ],i,lrhr:,i,i .-'lid. .i,!ill.< : :ld, ^.H ,hdu : 

 aiut4tli, H,.'//(>f.«— have the lip of the abdoineii white, 

 and all four are in niv eollertion and ditler from .■■■iihoir- 

 ticalix, the lirst in tin'' aiiteiior e(..\a' 1" iim partly white, 

 the second and third in the la. ■■■ l.ein-enlirely black, the 

 fourth in the lirst joint ot tli.' aiiteiime bein.n- white be- 

 neath and in all six lei^s except theirc'oxa' beiiii;- riiroiis 

 imniaciilate. Thelir.-t, second, and fourth, are also 

 about twice as large as xiili,:,jili,-alis. From lour ,i,j,iiia 

 described by the same author in $ sex only, \ iz : cu/iiilu, 

 ■naripen, com/rua and tnre//l(i . our '^ differs in being only 

 lialf as large, and also in other characters. As to the 

 tilth ./f/ci /if described by him in $ sex only, see the 

 two following paragraphs. 



Agenia AKCHiTEcrtrs, Say, .-? $ liright clear blue. 

 //««./ opaline, very tinelv andelo.serv punctate-; dark bine; 

 the faci'aiidclvpcus. espeeiall\ ,-?, with sihcrv i)iibc-s- 

 eence. A morem- le.-s di-tinet stria extending p-om the 

 antenine to the anterior ocellus. Clypeus,^' s<|Uarelv and 

 widely truni'alc; § \yidely rounded. jT/o//-.!.. sulio]ia(pie, 

 very tinely and closely punctate, and with limg pulies- 

 ceuce beneath and behind. Ahiloinen r? $ sculptured 

 .and shaped as in .nl..'.ui!.-il!« r? $ and Ih.' apical joint 

 ^ $ as in thai spe.ae-, aiiil blacker llian the rested the 

 abdomen. J.,<ix black immaeillate, the leiiiura faintly 

 tinged with bin.' UV//./.« subliyaliiic, § slightly more 

 tinged with duskv than (^ . Meuralion as in suhcoitica- 

 /«■».- Length ,^ il.'2T inch; ? 0.2!.)— ;!2 inch. 



Two r^ , bred from the clay-cell drawn in Figure 105, 

 h; 4 captured § . The r?. which is hitherto undeserihed, 

 Is at once distinguished from (j" suliruHu-nh'!.- by the 

 black I'ai'e and civpeus and imniaciilate black legs; but 

 5 can si-arcclv be distinguished from 2 »«'"•,./•//,„//,«, 

 except bv her greater size and brighter color. Say de- 

 scribes the teruiim ot his (ov/i //<///,< 5 as having ••the 

 anal segment polished ' ' Jlr. (.'rcssoii describes urrh!- 

 tedii.-) $ as having the anal segment ••brown and hairy," 

 without taking any notice of the smooth and iiolis'hed 

 space on its ujipcr surface, which, as he has since in- 

 formed me, occurs in all $ Aijeniu in the collection of 

 the Society except vupitla and pulflirippiinU. 



.Vr.EXiA CUPIDA, Cresson. — I possess a single $ of 

 this species, which is ^erv closclv allied lo llie preced- 

 ing §. It ditb-rs as Ibilows: 'Tin' anal segment is 

 brown, and entirely oiiaiiue, piibeseeiil and elo-ely and 

 rather lincly punctured, and has no polished space above. 

 This last character has been omitted in Jlr. Cresson's 

 tiescripfion, but only, as 1 am Informetl by him, through 

 an oversight. 



AOEXIA noMBYCiNA. Cresson— (Fi;;-. mi;, ;,.)— Out of 10 

 2 of tills species, the clay-ca'll of \\ liieh is sketched in 

 Figure lOI!, n, 7 $ have the front wings as described by 

 Mr. Cresson, viz, ••hyaline, cliisUy at lips," the dusky 

 part of the wing varying considerably in exliiit. and 

 ;! 2 have tlieiii entirely dusky. \'ery nunierous siicei- 

 mens (J 2 were bred by me from clay -cells found in 

 North Illinois under prostrate lo.gs; and from such 

 cells found in November in South Illinois under the bark 

 of a standing tree I bred 2 cT - $ '" '•"• dune of the 

 following year, and also the Crvupiilix to be presently 

 described. Of the 3 2 "ith dusky front wings, 2 $ 

 came from the hitter lot of cells and only 1 2 from the 

 former lot. 



GENTS CEROPALES. 



■ Ceroi'ales F.i'FiVENTRisn. sp. 2 (Fig- 108.)— Black. 

 Jlfti'l polished and glabrous, below the aiilenine opaijue 

 and with tine short appris-ed pube-eenee \\ iile aiile- 

 rlor and narrow posterior orbits, inleiru]ib-d on the 

 vertex, and al,-o the ilypcus ami :uid labriim, except 



upon each a large basal longitudiiuilly oblong black 

 patch not quite attaining the anterior edge, and the 

 mandibles except their extreme tips, all yellow. Palpi 

 pale rufous. Anteiuue two-tliirds as long as the body, 

 with joints 1 and 2 each rufous above, but yellow be- 

 neath and at tlieir tips. TJmrn.r glabrous and polished, 

 incsostcriiuin ami the sides and posterior surface of the 

 metathorax with fine white iiube-eemc. Hind edge of 

 I'oUare, a semicircular spot abo\e each of the front and 

 hind coxa', and a small transverse spot immediately 

 behind the scutel, all yellow. Ahthmun polished anil 

 glabrous; rufo-1'erruginous with the tip ot the ven- 

 tral valve and the sting blackish. Legs pale rufo- 

 ferruginous; the front of the anterior coxa> and 

 a small spot on the posterior tip of the anterior 

 tibia', yellow; and all the (i tarsi, except their 

 lilack fips, stained more or less with yellow. In the 

 four hind legs the entire last tarsal Joint is black, but 

 occasionally in the middle leg- (inly blaik above. 

 ^\'illgs fuscous, the apex of the Iroiit wings hyaline. 

 Wing-veins and stigma fuscous . — Length y o.'iii-lb.'io 

 inch; expanse O.o4— 0.60 incli. 



The (^ differs from 2 only as follows: 1st, The entire 

 face below the antennae, asiikso the dypeusand labruni, 

 is yellow immaculate. 2nd, The antenna; are full % as 

 long as the body, and joint 2 is blaek above instead of 

 rufous, and the basal Ja of joint 3 is yellow below in- 

 stead of black. 3rd, Besides tlie yellow markings on 

 the 2 thorax, there is a minute dot above bctwei'ii the 

 front wings and a rather larger one on the tip of the 

 scutel. 4th, In the front legs, the terminal >.^ of tin' 

 femora and the entire tibia' are po-teiiorly yellow, and 

 the tip of the midille tibia' is also yelloV. .'itli. The 

 wings are almost hyaline with cnily their extreme fer- 

 iiiinrd edges fuscous. — Length -j^O.-il inch; expanse 

 O..i0ineh. 



One (5', three 2 ! "'c ? ? captured in July on 

 umbelliierous flowers near Hock Island, Ills ; tlie cT 

 bred towards the eml of .lune from a lot of live clay- 

 cells Id' A,jt„ia lm,„h,ic;,ni rressoii. all found in Noyciii- 

 lier in one spot under the loose bark of a standing tree 

 in .South Illinois; four cells the ue.xt summer producing 

 four Ar/e/iia and the remaining one the jf Cei: rufiteii- 

 tris. Quite unlike the other S described N'. A. 

 CempaUs — of which I possess liijiniiiiiifii Say, fiat, nut 

 Smith and lontjij><« Smith, being :) .nit of tlie' .'i 'hitherto 

 found in the I] . S.— exeejit Or. uijihx .'Sniith (.Mexico), 

 the 2 only of which is known. Our 2 differs from 

 that 2 iu being marked with yellow instead of white; 

 in the antennal joints 1 and 2 being rufous above, not 

 black; in having no pale spot on the scutel, and no 

 "series of very niic short stria' on the anterior margin of 

 the mesothorax;' ■ in the eox;e not being blaik; and in 

 the wings not being hyaline, otherwise the resemblance 

 is very striking. "X may a<ld Iwre that I have always 

 taken Cer. hipundaia Say, upon umbelliferous (lowers in 

 considerable numbers, in company with various large j/ 

 Pompilus {P. nnifascialus, P. trojii'-iis, J', ntliiups, P. 

 j'n'i inilmns, etc.); and as C«/-. rvpentris \% wow proved 

 to bi' a (iuest-wasp infesting Agenia, I infer that Cn: 

 hipiiiuitila- is not improbably a' Guest-wasp infesting' 

 some large Pompihis. 



By an error of the artist, the tar.sl of the hind legs in 

 Figure 108 are drawn entirely too short; in nature they ^ 

 only lack one-sixth of being as long as the front wing. 

 The hind coxa3 also are represented .as only half as ro- 

 bust as they ought to be; in nature tlieir diameter is 

 onc^-half that of the abdomen. 



Ckropale.s longipes Smith(=('(»r. fnneiata Say.)— 

 The (f of this rare species is hitherto undeserihed". It (/ 

 differs from 2 only in having an adilitional pale fascia 

 on its .additional abdominal joint. Length cf 0.33 inch. 

 Two (^. three 2, all taken on iimbellifcrous flowers near 

 Hock Island, Ills. 



SPIIEX FAMILY. 



For the benelit of young entomologists, I append the 

 following table, by which the different modern genera 

 of the ,Sp7i(X family, that have hitherto occurred in 

 North America may be distinguished. The genera 

 not hitherto found there are inclosed in brackets [ ]. 

 All the genera of this family are characterized by hav- 

 ing the abdominal peduncle of coiisider.able length. 

 But the old Linna>an genus .s)<7(f.i'. which has been 

 split up into all these modern genera, included also the 



