380 ENTOMOLOGICAL XKVVS [Nov., '(X) 



striated ; the hind trochanters of the male are simple. 

 This group may be separated from group albitarse* by the 

 paler wings, the pale pubescence, the absence of a hoop on the 

 second ventral segment of the male, and the different clypeus 

 of the female. The following table will separate the species 

 of this group as far as they are known : 



Head and thorax with dense silvery pile (scutellum impressed medially ; 

 the apex of the metanotum transversely striated ; prothorax 

 bispinose beneath). Cuba, Jamaca, 111., N. Y. 



excavatum F. Sm. 



Head and thorax without dense pile, but with long hair i. 



1. Metanotum, except the base, transversely striated ; a patch of silvery 



pile below the tegulae. Mexico and Guatemala. 



cinereum Cam. 



Metanotum punctured, the apex sometimes with transverse striae ; no 

 silvery pile below the tegulae 2. 



2. A narrow transverse sulcus on the pronotum. 



albopilosum albopilosum ( Fox ) . 

 A broad, deep shining sulcus on the pronotum. 



albopilosum planoense Roh. 



Trypoxylon albopilosum albopilosum (Fox). 



The scutellum of this species is not always impressed nor is 

 there always an impressed line on the front. Specimens from 

 Lee County, Texas, have the wings somewhat darker than 

 specimens from Virginia. The distance between the eyes 

 at the clypeus is sometimes slightly less than the distance be- 

 tween them at the vertex. This species seems to belong to the 

 Carolinian and Austroriparian faunal areas. 



Trypoxylon albopilosum planoense n. subsp. 



Female. Length 18 mm. This form may be separated fro;;; albo- 

 pilosum proper by having the clypeus similar to it but the emargin- 

 ation much shallower; the ocellar area is more closely punctured; the 

 suture on the pronotum is broad, deep and shining; the scutellums 

 are not impressed ; the apical middle of the metanotum is not im- 

 pressed nor striated, but punctured like the rest of the metanotum. 



Type locality : Piano, Texas. Described from one female 

 collected by E. S. Tucker June, 1907. The type is in the 

 U. S. National Museum. 



*It seems quite probable that ncglcctnin Kohl is the malo of nlbi- 

 tarse. 



