SCUDDER. NORTH AMERICAN CEUTHOPHILI. 83 



besides the apical pair ; spurs subopposite, the basal at the end of the 

 proximal fourth of the tibia, considerably longer than the tibial depth, 

 set at an angle of 35-40 with the tibia and divaricating about 100, 

 their tips incurved ; inner middle calcaria considerably longer than 

 the outer, more than twice as long as the others or as the spurs, and 

 nearly or quite as long as the first tarsal joint. Hind tarsi about 

 two fifths the length of the tibiae, the first joint as long as the rest 

 together, the second fully twice as long as the third and with it rather 

 longer than the fourth. Cerci rather long and tapering, fully as 

 long as the femoral breadth. 



Length of body, 10 mm.; pronotum, 4 mm.; fore femora, 5 mm.; 

 hind femora, 9.8 mm. ; hind tibiae, 10.5 mm. 



6 $. San Pedro, Cohahuila, Mexico, May 20; San Lorenzo, Coha- 

 huila, Mexico, found in a cave among mummies, E. Palmer. 



41. CEUTHOPHILUS PALLESCENS. 



Ceuthophilus pallescens Brun.!, Can. Ent, xxiii. 37-38 (1891) ; 

 Id.!, Publ. Nebr. Acad. Sc., iii. 32 (1893). 



Very pallid luteous, marked with fuscous and blackish fuscous, the 

 latter in the posterior bordering of all the segments, the former in 

 obscure blotches on the pronotum and along its front margin, more 

 obscure in some specimens than in others; a mediodorsal luteous 

 thread breaks most of the fuscous markings of the body ; the legs are 

 very pallid luteous, sometimes infuscated on the distal portions of the 

 femora and especially in scalariform markings, never deep, upon the 

 hind femora ; the spines of the legs are all dusky tipped ; eyes black. 

 The antenme are slender and from twice to thrice the length of the 

 body, and the legs are rather long and slender. Fore femora scarcely 

 if any broader than the middle femora, about a fifth longer than the 

 pronotum and half as long as the hind femora, the inner carina with a 

 subapical spine sometimes accompanied by a shorter spine. Middle 

 femora with 4-5 delicate spines, the subapical longer than the others 

 on the front carina, and on the hind a similar series be-ides a not very 

 long genicular spine. Hind femora much shorter than the body, twice 

 as long as the fore femora, rather slender, being about three and a half 

 times longer than broad, tapering pretty regularly to the tip with no 

 genicular swelling, the surface with a few very scattered raised points 

 especially on the inner side and above beyond the middle, both carinas 

 minutely and rather distantly serrulate, the intervening sulcus slender. 

 Hind tibiae straight in both sexes, considerably longer than the femora, 

 rather slender, apically armed beneath with a series of three recum- 



