November iSqf,.] PSYCHE. 447 



as 2 : 2.5 :4.5 ; 7 ; basal segment yellow, cylin- apex of each hind tibia. Tenent hairs absent 

 ilrical, twice as long as broad, almost naked; throiighont. Furciila slender, mostly white, 

 second yellow or purplish, cylindrical, almost attaining ventral tube; manubrium exceed- 

 naked; third purple, cylindrical, subpetio- ing anal tubercle ; dentes three limes as long 

 late, with four distant whorls; terminal seg- ventrally, swollen at base, with dorsal, lat- 

 inent purple, tapering, blunt at apex, not eral and ventral rows of close, stout bristles; 

 ringed, with eight or nine distant whorls of mucrones (fig. 2) four-fifths dentes in length, 

 moderately long hairs behind the apex. spoon-like, lanceolate laterally, broadly Ian- 

 Antennae of males show the following re- ceolate from above, unsymmetrical, with 

 markable sexual modification (fig. 4). Seg- narrowly lanceolate, purple, apically pro- 

 menls as i: 1.5: 1:2; basal segment cylin- duced midrib from which radiate stout ribs 

 drical, twice as long as broad, and nearly to the inner serrate margin of the colorless 

 twice as broad as the other segments ; second limb and shorter weaker ribs to the oppo- 

 petiolate, sparsely hairy, bearing on the site, entire margin. 



distal half a row of three stout cylindrical Maximum length, .65 mm. Described from 



processes, the proximal of which bears a long, fifty types. 



falcate, chitinous hook, and the next a simi- I found 5. socicilis abundant at Belmont and 



lar. but small, hook; third segment contin- Arlington, Mass., from April 19 until May 



iiing the row with three finger-like processes, 14, 1896. It is found on the surface of ponds 



the distal of which is two-thirds and the and streams, feeds upon Desmids and skips 



proximal one-third the length of the segment, on the water in a lively manner, for which 



the )"emaining process being small ; ter?Tiinal purpose the furcula is peculiarly adapted 



segment simplv shorter and stouter than in The antennae of the male, modified to encir- 



the female. cle and hold those of the female, are strik- 



Body oval from above, with short bristles, ingly like those of the European 5. elegim- 



especiallv posteriorly; anal tubercle small, tulit^ Rent.* which Schott, with apparent 



hemisphericaf, yellow, with longer bristles ; reason, considers a variety of S- inahngrenii 



sternum w-hite, swollen at base of manu- Tull. In fact, socialis represents clegan/nliis 



brium ; ventral tube stout, cylindrical, in this country-, but is different in the follow- 



emitting two subpyritbrm processes. Legs ing important respects amongothers : soc/Vf//* 



stout, bristly, pale yellow excepting pur- has distinctly unidentate superior claws and 



pie apices of tibae. Superior claws of lanceolate mucrones with coarsely serrate 



fore and mid-feet (fig. i) unusually long, inner and entire outer margin, with produced 



half as long as tibia, a little curved, clearly midrib and without subapical incision; 



unidentate beneath, two-fifths from apex, pur- while elegantulus* has naked superior claws 



pie internally; inferior claw half as long, and elliptical mucrones with both margins 



purple at base, straight, slender, tapering. dentate, without produced midrib and with 



with a subapical bristle much exceeding the a suliapical incision, 

 opposing claw. Superior claws of hind-feet 



(fig. 3) two-thirds as long as those of fore- Smyul/inrus amicus n. sp. 



and mid-feet, stouter, smoothly curved and General color from rose pink to deep rose 



tapering, not dentate, purple basally ; infe- purple or violet. Head free, with short, 



rior claw two-thirds as long, white, broad, dense, defiexed bristles above the mouth, 

 roimded-triangular, inner edge convex, outer 



straight, near the latter a stout rib prolonged .c-... „ ,, , o . .-, 1 v u ■. 



» ' . * Schott, Harald. Zur Systematik uiid Verbreitung 



as far again, as an apical bristle. A conspic- Palae,irctisci.6r CoUembola. Kon. Sven. Vet. Akad. H.ind 



uous colorless space on the lower side of the Bd. 25, No. ii,p. 35, Taf. II, figs. 20, 2.-, 26, 1S93. 



