40 The Cras2)edosomatidse of North America. 



Pseutlotremia carterensis Bollman, 



P. caveniarum var. carterensis Packard: Proc. Am. Philos. Soc. XXI., p. 188 



(1883). 

 P. carterensis Bollman: Proc. U. S. Nat. Museum XI., 1888, p. 405; Bulle- 

 tin 46 U. S. Nat. Museum, p. 107. 

 Eyes of 17-25 ocelli, grouped in triangular i^atclies, but usually not in re- 

 gular rows. 



Posterior subsegments dorsally densely and evenly tuberculate with rounded 

 elevations of somewhat equal size. 



Male genitalia (plate I, figs. 9, 10) consisting of three structures: 



1. A thin subplane lamina, with subparallel sides, one of which turns dis- 

 tally at a sharp angle and is produced into a tapering though blunt-pointed 

 process. The other margin is broadly sinuate, the distal half fimbriate vpith 

 fine short hairs, the apical corner cut into longer laeinefe. 



2. A thin lamina apically curved upon itself and tapering to a point. A 

 duct can be traced from the base to the apex. 



3. A bifid subplane lamina, lying between the bases of the ninth pair of 

 legs, similar to that described for P. cavernarum. 



Color above dark horn-brown, sometimes variously mottled with yellow on 

 the the carinse; below, and basal joints of legs yellowish in alcoholic speci- 

 mens, the apical joints and antennae horn brown. Length 23-30 mm. in ma- 

 ture individuals; diameter 2.5-3 mm. 



Habitat: "The Carter Caves, Kentucky, viz.: Bat Cave, X 

 Cave and Zwingler's Cave, besides a cave across ttie road from 

 the hotel, which is used as an ice-liouse," (Dr. Packard); Wyan- 

 dotte Cave (Mr. Bollman). We have seen four individuals from 

 Wyandotte Cave (U. S. N. M. 436). 



This species is the largest member of the family yet known 

 from North America, and appears very distinct from P. caver- 

 narum in its dark brown color and larger size. A careful exam- 

 ination, however, reveals the closest similarit}^ in minor details, 

 and we liaA^e not made our desciption extensive, for beyond the 

 characters noticed above all the statements made for P. caver- 

 narum seem to apply to this species. The e3^es are more promi- 

 nent and better pigmented, the segments more evenly tuberculate, 

 the color darker, the size usuall}^ larger, and the genitalia en- 

 tirely different. The antennae and the relative proportions of 

 their joints are variable in both species and we have been unable 

 to observe an^^ constant difference. 



That the species, however, is valid cannot be doubted. The 

 male genitalia have but little similarity of detail with those of 

 P. cavernarum. At the same time the legs of the ninth pair are 



