July, 1902] 



PSYCHE. 



3G5 



equally tridentate ; apical tooth sharp, feebly 

 hooked or, rarely, falcate ; second conical, 

 erect; third a tritle smaller than second, erect 

 or else slightly inclined caudad, situated mid- 

 way on the mucro anti latei'ad of the other 

 teeth. The mucrones vary considerably in 

 minor details as shown in figures 6-S ; in one 

 case, the third tooth was absent on the left 

 mucro but present on the right one, and in 

 a single instance the proximal tooth was 

 doubled on both mucrones (fig. S). Clothing 

 of numerous short appressed setae, which are 

 restricted to the middle half of each segment, 

 leaving the anterior and posterior fourths of 

 the segment bare ; longer, stiff setae at the 

 apex of the abdomen ; short stiff bristles on 

 antennae and legs ; short curving setae on the 

 urcula with a few long erect ones. Maxi- 

 mum length, 1. 8 mm. 



Thi.s species is quite distinct from any 

 hitherto described. It formed ninety- 

 seven per cent of all the specimens ex- 

 amined. 



Over 5400 types: 2 (600), 4 (45), 

 12 (15)' '3 'yi2,)' 14 (200), IS (100), 

 75 (1), 100 (300), loi (79), 164 (s), 

 182 (75), 184 (100), 186 (200), 187 

 (500), 188 (8), 193 (150), 195 (24), 

 201 (20), 204 (i), 223 (15), 231 (60), 

 243 (17)' 24s (14), 248 (i), 259 (50). 

 270 (200), 308 (i), 324 (21), 331 (i), 

 332 (100), 347 (8), 356 (4), 357 (25), 

 362 (300), 380 (4), 383 (i), 390 (50), 

 394 (2000), 407 (70), 408 (50), 422 

 (i), 429 (86). Type No. 6144, U. .S. 

 National Museum. 



■ Entomobrya lucifuga, sp. nov. 



Figures 9-10. 



White. Eyes absent. Antennae twice as 

 long as the head, or more than half as long 



as the body, with cylindrical segments, re- 

 lated as 11: 16: 18: 26. Mesonotum con- 

 cealing the pronotum. Superior claws Cfig. 9) 

 broad, curving, with a pair of large triangular 

 basal lamellae and beyond these an obsolete 

 tooth ; inferior claws extending three fourths 

 as far, lanceolate, acute with sinuate outer 

 margin; hind claws largest ; one short tenent 

 hair with a small knob. Abdomen dilated ; 

 fourth segment four times as long as the 

 third. Furcula attaining the ventral tube ; 

 denies half as long again as the manubrium ; 

 mucrones (fig. 10) long, falcate, the second 

 tooth equidistant from base and apex and the 

 basal spine strong ; two barbcllate dental 

 setae attain the apex of the mucro and a third 

 one exceeds it considerably. Stout clavate 

 barbellate setae are found on the first two 

 antennal segments and the coxae, are profuse 

 on the head, meso- and metanotum, and 

 occur, constantly diminishing in number, on 

 the middle of each succeeding segment. 

 Simple barbellate setae occur densely on the 

 appendages and the apex of the abdomen ; 

 the furcula bears many suberect clavate 

 barbellate setae. Maximum length, 1.7 mm. 



One hundred and thirty-one types : 7 

 (30), 8 (2), 9 (II), 10(3), 17 (i), ,8 



(6), 105 (3)' 112 (7)- 123 (9)1 143 (2), 

 151 (0, 153 (12), 156 (2), 178 (4), 

 219 (12), 229 (1), 237b (2), 288 (i), 

 331 (4), 356 (3), 358 (4), 363 (2), 366 



(S). 383 (i)> 399 (1)^ 414 (i), 422 (i). 

 Type No. 6145, U. S. National Museum. 



Sinella tenebricosa, sp. nov. 



Figures 11-14. 

 White. Eyes absent. Antennae (fig. 11) 

 half as long again as the head, with segments 

 as 3 : 6: 5 : II ; third segment subclavate, 

 fourth elliptical. Prothorax exposed. Su- 

 perior claws (fig. 12) broad, almost straight, 

 with a long tooth in the middle and a long 

 Bubtriangular acuminate basal lamella ; front 



