N'ovember 1^96 ] 



PSYCHE. 



4^9 



processes three times its length, cylindrical, 

 not papillate, truncate. Legs short, stout, 

 yellow, black basallv, \yith short, sparse 

 bristles, claws small, stout. Superior claw 

 blunt. %yith straight, untoothed inner edge; 

 inferior claw two-thirds as long, broadly 

 triangular, untoothed. Tenent hairs two. 

 Furcula short and stout; manubrium short, 

 almost naked; mucrones with a few short 

 biistles in lateral and ventral rows, also a 

 long ventral bristle beyond the base and a 

 second before the apex; mucrones one third 

 dentes in length, long triangular, apex down- 

 bent but not hooked, ventral margins usually 

 entire, rarely with a few minute teeth near 

 the base only. 



Maximum length .75 mm. Described from 

 ten types. 



5. remotus occurred during last May at 

 Belmont, Mass., on dead logs in a peat bog. 

 Its nearest allies are 5. uiger Lubb. and 

 .5. tninutn^ MacG. 



Smyntkuyiis fi/c/iii, n. sp. 



Pale, translucent yellowish-green. The 

 contents of the alimentary canal, which 

 show through the skin, give the appearance 

 of a large, blackish, backward pointing tri- 

 angle, extending the length of the dorsum. 

 Body in largest specimens dusky throughout 

 with large, pale, rounded spots laterally. 

 Head free, pale green, with stout, white, 

 cfirving bristles. Eye spots black, often 

 pyriforni. Antennae over half the length of 

 the body, purplish, paler at base, geniculate, 

 segments as i: 3:6:16, cylindrical; basal 

 segment short, stout, almost naked; second 

 sparsely bristly; third more bristly: termi- 

 nal segment with seventeen or eighteen dis- 

 tinct subsegments, each with a whorl of 

 moderate bristles. Body oval from above, 

 sometimes strongly angulated behind, with 

 stout recurved bristles denser behind, each 

 often arising from a pale, ch'cular spot; anal 

 tubercle distinctly of two segments, pale 

 green, bristly. Sternum posteriorly with 

 many small, rounded, white spots, closely in 



four gi-oups. \'enlral tube stoutly cylindrical 

 processes almost as long as the antennae, 

 cylindrical, densely papillate except basally. 

 Legs pale green, bristly, hind claws largest. 

 Superior claws spoon-like; outline, when 

 viewing the concave surface, broadly oblong 

 with rounded apex and a long tooth on the 

 middle of either side; outline in side view 

 finger-shaped. Inferior claws, except hind 

 pair, perfectly distinct, as long as the op- 

 posing claws, straight, slender, acuminate, 

 with a projecting angle on the inside near 

 theba-e; hind pair two-thirds the opposing 

 in length, broadly triangular with straight 

 external edge and obtuse internal angle, 

 the latter bearing a stout tooth. Tibiae 

 apically with two or three long, unknobbed 

 hairs. Furcula pale green, reaching beyond 

 ventral tube; manubrium short, stout, not 

 swollen, with short bristles; dentes each 

 with three long ventral bristles, also ventral 

 and lateral rows of short bristles, eight in a 

 row, not half as long as the width of a dens; 

 mucrones spoon-like, spatulate. crenate on 

 inner edge, in side view tapering and with 

 apex down, bent and obliquely truncate. 



Maximum length. 2.:: mm. Described from 

 thirty types. 



I found this species common after a rain 

 on dead sticks in pine woods ;it Arlington, 

 Mass., Aug. 19, 1S92. Two days later few 

 could be found. It is nearest to 5. spit/aiiis 

 MacG. but differs notably in markings, claws 

 and furcula. I take pleasure in dedicating 

 S. Ji/c/iii to the first careful student of North 

 American Thysanura. 



Sniy)i//iiinfs ^lens/nizviiy n. sp. 



Orange. Dorsum dusky in large speci- 

 mens. Head free, moderately clothed with 

 short, stiff bristles. Eye spots black, a huge 

 bulT spot against the inner side of each and 

 a small, black, ocellus-like spot in front of 

 and between Ihem. Face strongly gibbous 

 above the mouth. Antennae thi-ee-fifths the 

 body in length, outer half blackish, segments 

 as 1:2:3:6; basal segment stout, naked; 



