420 t'UOOIHJDlMW OF THE NATIONAL MUSliVM. vol.40. 



AHOY I^EOMY I A, wow gonus. 



(h'liolypc. Aiyi/iroDiyia hiisckii, m^^w spocios. 



l)ilV(M-s Irom Ih })tiav(jym as follows: 



Male. i*'ronl mo(. as proiniuoiit, oquilaloral, ahoul. four-nftlia as 

 Avido as ouo (\vo; parMlrontals projiM'tod iinvnrd ovor froivlnlia on 

 aulorior hall' whoro (.li(\v iioarly moot, aftor Mu> inaimor of Afttopiops, 

 ])ost(>riorly morf^iMl \\\{\\ froiUalia; only ouo ])rooliiial.o frouio-orbitiil; 

 faoialia l)iir(>; i>iirnfaoinls uarrow(M', consiiionously uiuTowod Ixvlow; 

 i\Vos dos('t>iidiu«:; as low ns vd)rissa.o, <'Iuh>Us v(>rv narrow; oidy (hroo 

 ])aii*s of IVonlais, if wo o\C(^pt n docussalo n^oliualo ])air boliiud (honi 

 which n|>pt>ar as a. tiiird ]>nir of r(M•liulll(^ fronio-orbitnls but aro in 

 liiu> Avilh froiilals. Vnvo only n litllo wid(Mu^d from front., ahont. ouo 

 and ouo half (iiuos v(vrl(>\ a(. wid(>sl. Mnin (lioraoio ohaolot.axy 

 sanit>. but. only two pri>aori)sti('.ha]s; no disoals on sooond nhdomiiuil 

 sl^«:;mtMlt.. AlxlonuMi uMrrow(M*, lonujiM*. ovo-conicial. lliuii tihiao 

 sparsoly ]>oct.inatt>, with loui^cM- l)rist.l(>. Abdominal maoroohaotao 

 oroct. and h»i»^. anal S(\i;m(Mit. with ninr<;iu!il and disonl rows. Abdo- 

 inoii not. thickly hairy. Tiiird voiu bristled t.o smnll crossvoin; hind 

 orossvoiu not. so conspicuously ap]m)xinuil.od t.o cubitus. 



ARGYRKOMYIA HUSCKU. now spoclea. 



TiOUgtb of body. S nun.; of wiui;, nbout. ().7r> nun. Ono mnJo, 

 Porto RoUo. Panama, March II. \\)\\ {\U\^ck). 



\Vholo fact\ front., aiul mososcutum burnish(>d silv(>ry-whito; 

 ]>b>ur.'U> Miul oMtsid(> of front f(Muor:i nlso silviMW -white, but. bvckiu}:; 

 tho burnislu>il <>tVi>(\t ; scuti^lhim auil abdonuM\ silv(>ry -white, not. 

 burnished, the tii-st. sej^nuMit. and ratluM' broad hind marjj;ius of bi^t 

 thrive blackish, the polliMi of bases of se^m(>uts with a brassy tiivgo 

 suiH^^ssively bn^-vdcMuni; to !in:d s(>j;nu>iit., which is nuu'o than half so 

 coven^d. lit^i^s bhick. I'alpi rufous. AntiMinat> obscurt>, third joint 

 sliowiuj; slii:;ht. rufous shad(\ the whol(> (M)V(M-tul with sil\ (M' bloom. 

 Winp^ cl(>ar, the costa. tiui;ed with smoky ^'oldeu. 'r(\i;ulae white. 

 'V\\o post(M-ior half of fronlalia is silvenxl likt> thi^ pjirafroutals with 

 which it is uuM-i;ed; tlu> antcn-itu- half shows only as a brown hiu>. 



Holoti/p(. CVl. No. l'.)C>U). IIS.N.M. 



Family l.AKVAFAOKIOAM 

 EXORISTOPSIS, luvv gonus. 



(fcnott/pf. ■Kwr'istops^i.'i sttiftra. new sptH'ies. 



DitVei-s from KvoristoiJes as folloM-s: Thiril autennal joint abso- 

 hitely strai,i::ht on front bord(M-. b>ontal bristles dosceudini:j about 

 to arista. (Mun^ks hardly oue-f«>urth eye-heii^ht. Arista thickened 

 on basal two-lifths, siH'ond joint not U>Ui;iM' than wide. Throo 

 sternopleurals. Front tai-si ol female nornud. First, vein bristly 



