574 PROCEEDINGS OF THE NATIONAL MUSEUM vol. m 



Description. — Agreeing with the generic description except in the 

 following important modifications: 



Head : Juga dorsally always with entire, fine, marginal carina, with 

 partial row of setigeroiis punctures reaching about two-thirds from 

 eye to apex; labium reaching between middle coxae. 



Mesopleuron: Evaporatorium restricted (fig. 106), reaching not 

 more than three-fourths across segment, separated from posterior 

 margin on outer half or more by a polished band; posterior margin 

 with large, quadrate, widely separated crenulations (fig. 106). 



Legs: Posterior tibia of male moderately curved, with distinct, sub- 

 basal angulation on posteroventral margin, basad of which is a row 

 of fine, rounded, crenulations (fig. 148); posterior and sometimes 

 middle femora with numerous small tubercles on ventral face. 



Type of subgenus. — Pangaeus discrepans Uhler (1877, p. 386), 

 here designated. 



Distribution. — This subgenus occupies the northernmost segment 

 of the range of Dallasiellus, being known generally from the territory 

 west of the Rocky Mountains from Washington south into northern 

 Mexico and eastward through New Mexico into western Texas and 

 Oklahoma. 



Discussion. — The transfer of Uliler's species discrepans from 

 Pangaeus to its present position removes one of the enigmas in North 

 American hemipterology. At the same time, the nearness of this 

 subgenus to Pangaeus through discrepans is recognized. As was 

 noted in the discussion of Dallasiellus, this genus serves as a 

 vehicle for the least strongly modified species of Western Hemisphere 

 Cydnidae. Since such is the case, one should not be surprised to find 

 that some of the included species do resemble certain of the more 

 strongly marked genera, even though they lack the unique separating 

 modifications of those genera. The present subgenus, Pseudopan- 

 gaeus, resembles Homaloporus, the northern subgenus of Pangaeus, in 

 several interesting respects. First, it is somewhat northern in distribu- 

 tion, occurring mostly within the United States. Secondly, there are 

 the following structural parallels: (1) Several setigerous punctures on 

 jugal submargins; (2) usually (except in D. calijornicus) with four or 

 more costal setigerous punctures; (3) the miCsopleural evaporatorium 

 is restricted; (4) osteolar peritreme lacks a terminal difi'erentiation, 

 and its evaporatorium has lateral margin strongly concave. The 

 modification of the hind legs (ventral tubercles on femora of both 

 sexes, and the subbasal angulation on the tibia of the male), which 

 forms such a prominent character here, is duplicated in the subgenus 

 Homaloporus in Pangaeus setosus, new species, and Pangaeus 

 tuberculipes, new species. These several similarities suggest the possi- 

 bility that the species of subgenus Pseudopangaeus actually belong 



