366 



PSYCHE. 



[July, 1902 



pair of superior claws two thirds as long as 

 the others ; inferior claws three fifths the 

 length of the superiors on the front feet and 

 three fourths on the others, straight, broadly 

 linear, acute, with a large ovate acuminate 

 lamella on the basal half of the outer margin ; 

 one imknobbed tenent hair. Abdomen di- 

 lated ; fourth segment two and one half 

 times the third in length. Furcula attaining 

 the ventral tube ; dentes a little longer thaiT 

 manubrium; mucrones (fig. 13) simple, fal- 

 cate, with a long curving basal spine that 

 attains the apex of the mucro. Sparse short 

 ciu-ving bristles on head and bodj ; many stiff 

 barbellate setae on the appendages ; a few 

 erect barbellate setae on the first twoantennal 

 segments and on the legs ; stout clavate 

 barbellate setae (fig. 14) occur on the vertex, 

 coxae, meso- and metanotum and the last 

 three abdominal segments. Length, .9 mm. 



S. tenebricosa is closely allied to the 

 European S. hofti SchSf., * from which 

 it differs chiefly in the claws. 



Twenty-four types : 10(15), 51 (5), 

 178 (2), 229 (1), 383 (i). Type No. 

 6146, U. S. National Museum. 



Pseudosinella argentea, sp. nov. 



Figures 15-16. 



White. Eyes absent. Antennae one and 

 one half times as long as the head and half the 

 length of the body, with segments related as 

 5: 10: u: 17; third segment clavate, foiu'th 

 elliptico-cylindrical. Thorax arched ; meso- 

 notum almost as long as the head and conceal- 

 ing the pronotum. Superior claws (fig. 15) 

 stout, apically curving, unequally tridentate, 

 the two proximal teeth being side by side ; 

 inferior claws two thirds as long on hind 



*C. Schaffer. Die Collembola der Uingebung von 

 Hamburg und benachbarter Gebiete. Mitth. Nalurli. Mus. 

 Hamburg, bd. 13 (1896), pp. 147-216, taf. 1-4. See pp. 

 192-193; taf. 4, figs. 103-105. 



pair, and half as long on the other feet, 

 broadly linear, acute; tenent hair small, un- 

 knobbed. Abdomen moderately dilated; 

 fourth segment three times as long as the 

 third. Furcula extending beyond the ventral 

 tube ; manubrium and dentes subequal in 

 length ; mucrones (fig. 16) basally suboblong 

 with two subequal teeth and a long basal 

 spine that attains the apex of the proximal 

 tooth. Large rounded scales on head, body, 

 and the under side of the furcula; dense stiff 

 setae on antennae and legs; a dense cluster 

 of stout rigid setae on the anterior border of 

 the mesonotum and a few such setae above 

 the antenna.e; dense short curving feathered 

 setae occur at the apex of the abdomen and 

 on the upper surface of the furcula. Length, 

 1.25 mm. 



This new species differs as to claws 

 and mucrones from P. cavernarum 

 Moniez * (Tullbergia immaculata Lie- 

 P. t) and P. virei Abs., % its nearest 

 allies. 



A unique type, No. 156. Type No 

 6147, U. S. National Museum. 



Pseudosinella Candida, sp. nov. 

 Figures 17-ig. 



White. Eyes (fig. 17) sixteen ; a black 

 interocular V-shaped mark sometimes occurs. 

 Antennae one and one fourth times as long 

 as the head, with segments as 6: 10: 10: 22; 

 basal ring one fourth as long as the first seg- 



* R. Moniez. Espfeces nouvelles de Thysanoures trouv^es 

 dans la grotte de Dargilan. Rev. biol. nord France, t. 6 

 (1893), pp. 81-86. See pp. 84-85. 



\ O. J. Lie-Pettersen. Norges Collembola. Bergens mus. 

 Aarb. 1896, no. 8, 24 pp., 3 pis. See pp. 15-16, pi. 2, figs. 

 1-4. 



t K. Absolon. Uebereinige tlieils neue Collembolen 

 BUS den Hohlen Frankreichs und des siidlichen Karstes. 

 Zool. Anz., bd. 24(1901), pp. 82-go, 10 figs. See pp. 87-SS, 

 figs. 6-8. 



