THE CANADIAN ENTOMOLOGIST. IS 



NEW GEiNERA OF NORTH AMERICAN LlTHOBIIDyE 



BY RALPH V. CHAMBERLIN, UNIVERSITY OF PENNSYLVANIA, PHILADELPHIA. 



In a Study of the North American species of the Liihobiidae that fall 

 into the old genus Bothropolys as originally defined by Wood — that is, all 

 those species having the coxal pores, in several series the writer finds that 

 they compose in reality two clearly separated groups of generic value. In 

 addition a third genus, represented by a species here described tor the first 

 time, is found, which, while evidently close to the other two in some 

 features, differs from them in having the coxal pores arranged in but a 

 single series. Diagnosis of these genera are herewith given together with 

 those of other genera. 



Genus Bothropolys Wood (emended). 

 Head margined continuously from the caudal end cephalad to the 

 eyes on each side, the lateral margin not broken. Prosternum with a well 

 chiiinized spine on or near the anterior margin at each ectal angle ; pros- 

 ternai teeth more or less uniformly spaced with no diastema separating 

 them into two groups on each side. Gonopods of the male consisting- of 

 a single undivided article. Basal spines of the gonopods of the female 2 + 2. 

 Anal legs with the tarsal claw single; penult legs with the tarsal claw 

 armed at base with a single small or sometimes obsolete spine or accessory 

 claw, or this sometimes quite absent. Coxal pores in several series. 

 (Coxae of last two pairs of legs armed each with a stout ventral spine.) 

 Type. — B. imdtidentatus (Newport). 



In addition to the type, B. hoples Brolemann and B. perinundiis 

 Chamberlin belong in this genus. 



Genus Ethopolys gen. nov. 

 Lateral margination of head ending abruptly about one-third the 

 distance forward from the caudal edge, each lateral margin being distinctly 

 broken — that is, rectangularly bent in at this level. A wider interval of 

 diastema separating an ectal group of from i to 4 prosternai teeth on each 

 side from an inner larger group, a slender, often more or less bristle-tipped 

 spine, occurring in the diastema, but none at the ectal angle. Gonopods 

 of the male distinctly biarticulate. Basal spines of the gonopods of the 

 female 2i^ Z- Tarsal claw of anal legs with a very small spine or accessory 

 claw at base \ the claw of penult legs with two accessory claws. Coxal 

 pores in several series. (Cox?e of last two pairs of legs each armed with 

 a stout ventral spine). 



Type. — E. xant i {}Yooij). 



June. 1912 



