Vol. xxix] ENTOMOLOGICAL NEWS. 5 



A Generic Assignment of Three North American 

 Species of Dermaptera. 1 



By MORGAN HEBARD, Philadelphia. 



LABIIDAE. 



LABIINAE. 

 Barygerax auricoma (Rehn). 



1903. Labia attricoma Rehn 2 , Ent. News, XIV, p. 2g2. [ ? ; Piedras 

 Negras, Costa Rica, (Schild and Burgdorf).] 



This insect differs strikingly from the genotype, B. csau 

 Hebard, in the decidedly smaller eye and similar but less strik- 

 ingly flattened-moniliform antennal joints. The forceps are 

 much heavier and shorter in auricoma, but as csau is known 

 only from a male and the present species from a female, we 

 are unable to determine the degree of difference in this feature 

 for the same sex in each species. 



The following features are noted for the type. Head blackish 

 brown; eyes small, one-third as long as cheek. Antennae with first 

 joint three and one-half times as long as basal width; second minute, 

 not as long as broad; third slender, about twice as long as broad; 

 fourth and fifth joints heavier, appreciably longer than broad; suc- 

 ceeding joints flattened bead-like, submoniliform, the longest twice 

 as long as broad. Pronotum yellowish, about as long as broad, caudal 

 margin evenly convex. Tegmina broad, convex, ample, leaving only 

 the extreme tips of the wings projecting, much as in csau; tegmina 

 and wings bluish black. Abdomen and limbs yellowish, discolored. 

 Forceps reddish yellow, very short and heavy: length twice basal 

 width; showing a short median flange dorso-proximad as in csau. 



Barygerax breviforceps (Caudell). 



1907. Labia breviforceps Caudell, Proc. U. S. Nat. Mus., XXXIII, 

 p. 174. [$; mouth of Rio Dulce, two miles from Livingston, Guate- 

 mala, May 5, 1906, (H. S. Barber).] 



This species differs widely from both B. csau and B. anri- 

 coiitu in its Imffy general coloration, tegmina similarly elon- 

 gate but narrower, with costal and sutural margins parallel 



1 It was intended to include the study of these forms in a recent 

 paper by the author, "Dermapterological Notes," Proc. Acad. Nat. Sci. 

 Phila., 1917, pp. 231-250, but as the loan of types from the National 

 Museum was not granted, the examinations were not made until a 

 visit to that institution was possible, where the material discussed here 

 was examined. 



- Assi-ned with a query to Prohibia by Burr in the Genera Insec- 

 toruni. 



