SUBFAMILY VII. RHAPHIDOPIIORIN.E. 607 



ents, especially those living in the vicinity of caves where one or 

 more species of the group can usually be found in numbers. The 

 principal information concerning the North American forms of 

 the subfamily will be found in the following works: Scudder. 

 1861, 1862, 1804; Brunner, 1888; Packard, 1873, 1888; Blatchley. 

 1893, 1897, 1903; Caudell, 1916; R. & H., 1916. 



Of the 12 genera recognized by Caudell (1916) as inhabiting 

 North America but four are known to be represented in the 

 Eastern States, though a single species of another may occur. 



KEY TO EASTERN GENERA OF EHAPHinOPHORINM-:. 



a. Fore femora more than twice as long as pronotum; last joint of palpi 

 scarcely longer than third and cleft beneath only apically; lateral 

 lobes of pro-, meso- and metanotum very shallow, not covering the 

 corresponding epimera (Fig. 204.) I. HADENCECUS. 



oa. Fore femora less than twice as long as pronotum; last joint of palpi 

 (except in Phrixocnemis) distinctly longer than third and usually 

 cleft beneath for almost its entire length; lateral lobes of pro-, 

 meso- and metanotum deeper, covering in great part the epimera 

 (Fig. 206.) 



&. Hind tibiae armed above on both margins with very numerous 

 short, close-set teeth of subequal length and one longer pair 

 near apical fourth; vertex with a pair of conical tubercles be- 

 tween the antennae; basal joint of hind tarsi prolonged above 

 second joint into a short, sharp spine; surface pubescent (Fig. 



205.) II. DlESTRAMMENA. 



bb. Hind tibiae armed above with short teeth and several pairs of long 

 movable spines; vertex not or feebly tuberculate; basal joint of 

 hind tarsi not prolonged above; surface glabrous, 

 c. Second hind tarsal segment no longer than deep, subequal in 

 length to third; hind tibiae shorter or at most but little 

 longer than hind femora. 



d. Fore tibiae armed above about the middle of the inner margin 

 with a distinct spine; third joint of palpi shorter than fifth. 



III. UDEOPSYLLA. 



del. Fore tibiae not armed above; third palpal joint as long as 

 fifth; hind tibiae with five or fewer short teeth between the 

 longer dorsal spurs. PHRixocNEMis. 73 



cc. Second hind tarsal segment distinctly longer than deep, third 

 not more than half as long as second; front tibiae not armed 

 except toward apex; hind tibiae usually distinctly longer than 

 hind femora and with numerous serrations between the longer 

 dorsal spurs. IV. CEUTHOPHPLUS. 



73 The genus Phri.rocncmis Scudder fiSqi, IGJ) is here included since it may lie rep- 

 resented by a single species east of the Mississippi, as the female type of P. inliahilis 

 Rehn (19046) (P. truculentus Scudder?) was taken at St. Louis, Mo. 



