16 h Canadian Arctic Expedition, 1913-18 



the group as a subfamily, Chilenophilina?, in the Geophilida?, and in the same 

 year also by Brolemann 1 who regarded the group as a subtribe, Ribautiina, 

 under his tribe Geophilini. Since then the group has proved to be increasingly 

 large and widespread. One genus has been previously recorded from Alaska, 

 Arctogeophilus glacialis Attems being listed in the original aceount as occurring 

 on both sides of Bering strait, namely, from Naniamo and Konyam bay on 

 Seniavine sound on the Siberian side and from Port Clarence on the Alaskan. 

 I suspect, however, that the specimens from the Alaskan side belong rather to 

 the species described below as new, the two forms being very similar in size, 

 structure and general appearance and both possessing thirty-nine pairs of legs, 

 the two apparently to be distinguished only by critical examination. For the 

 Alaskan species, after much hesitation, I have felt compelled to erect a separate 

 genus, the only alternative being to assume that so experienced a student of 

 the group as Graf Attems was mistaken in his observations on several characters 

 of fundamental importance, which, in the absence of authentic material of his 

 species I do not feel justified in doing. In addition, I have specimens of a species 

 of a third genus from Forrester island, this being Gnathomcrium melanonotum 

 Wood, a form common from California northward through Oregon and Wash- 

 ington into British Columbia. The position of the new genus among the other 

 known genera of the Chilenophilidae may be indicated by means of the following 

 key. 



KEY TO GENERA OF CHILENOPHILID^. 



a Anal legs with an additional article replacing the claw. (Lateral pieces of the labrum 

 separated by the median piece.) 

 b Coxae of second maxillae very broadly and completely fused. Ventral pores in four 

 areas. Coxopleural pores small and very numerous both above and below. 



Telocricus Chamber lin. 



bb Coxa? of second maxillae' separated or at most weakly united by a membranous isthmus 

 c With no ventral pores; no finger-like process from distomesal angle of coxa of 

 second maxillae. 

 d A large lappet on coxa of first maxillae in addition to one upon succeeding 

 article; prosternum without chitinous lines. Watophilus Chamberlin. 



dd Lappet present only on femuroid of first maxillae; prosternum with chitinous 

 lines. Alloschizotaenia Brolemann. 



cc Ventral pores present ; a finger-like process at distomesal angle of coxa of second 

 maxilla?; first maxillae without lappets. Proschizotaenia Silvestri. 



aa Anal legs without such additional terminal article in place of the claw, either bearing claws 



or when clawless composed simply of the usual six articles distad of the coxopleura. 



b Lateral pieces of labrum overlapping the median piece and in contact at the median line 



c Ventral pores present; lappets of second maxillae rudimentary; coxae of second 



maxilla? wholly separated. (A clypeal area present.) Chilenophilus Attems. 



cc No ventral pores ; lappets of second maxilla? well developed ; coxa? of second maxillae 

 more or less clearly united. 

 d No clypeal area present. 



e Palpus of second maxilla? quadriarticulate. Arctogeophilus Attems. 



ee Palpus of second maxilla? triarticulate. Gnathomcrium Ribaut. 



dd A clypeal area present. 



Palpus of second maxilla? triarticulate; anal legs clawless. 



Cryophilus gen. nov. 

 bb Lateral pieces of labrum not in contact at the middle line, more or less widely separated 

 by the median piece, 

 c One or more clypeal areas present, 

 o? No ventral pores present. 



e Distoectal angle of tibia of palpus of second maxilla? prolonged and strongly 

 chitinized. Gnathoribautia Brolemann. 



ee Distoectal angle of tibia of second maxilla? not thus prolonged. 



Taiyuna Chamberlin. 



1 "A propos d'un Systeme des Geophilomorphes," in Arch, de Zool. Exp. et Gen., 1909, ser. 5, 

 3, p. 327. 



