280 
NORTH AMERICAN MYRMOSIDAE 
Anterior metatarsus without noticeable spines; middle tibia with one or 
two inconspicuous spines near its apex on the outer surface, and two or three 
strong ones on the apical part of its posterior edge; posterior tibia with two or 
three spines on its posterior edge. 
Abdomen sessile, its first segment short, broad, and thick, enlarged from al- 
most the verj' base, without or with scarcely any anterior neck, rather deeply 
constricted from the second, its sides coarsely punctured; dorsally, like the 
rest of the abdomen it has few and small punctures; pygidium deeply emargin- 
ate, its sides margined, but not strongly, with a median, longitudinal, elevated, 
impunctate fold, between which and the sides are four or five coarse punctures. 
Sagitta much reduced, weakly ehitinized, as seen from the side squarely 
truncate, as seen from above, strongly compressed, the ends rolled outward; 
volsella a small compressed button; ramus moderately broad, its posterior 
margin emarginate, its superior hind angles not produced, bluntly rounded, 
its inner surface with a brash of a few weak hairs; squama acute, its posterior 
margin not notched; uncus deflexed, the basal half strongly compressed, the 
apical half flaring, truncate (figures 28 and 29) . 
Type material. — Holotype; Calexico in the Imperial Valley, 
California, August 11, 1914, (the author), [Cornell University, 
No. 126.1]. Thirteen paratopotypes: same date. The figures 
and description of the genitalia are from a paratype. 
The position of the insertion of r-m on M in the front wings 
varies from slightly basad to slightly apicad of m-cu. 
This species finds a very close ally in B. brevis Fox. In that 
species-, in addition to the characters used in the key, the uncus 
appears more trumpet shaped as seen from above, and the squa- 
mae are less slenderly acute. 
Brachycistis (Brachycistis ) perpunctata Cockerell, cf . 
The wings are illustrated in figure 20. 
New Mexico: Las Cruces, type. California: Claremont, 1 cf, and 
mountains near Claremont, Icf, (C. F. Baker), [Cornell University and 
Pomona College]. 
Brachycistis rutilans (Blake), 9 . 
A specimen before me agrees entirely with the type, but is in 
much better condition. 
In describing this species Mr. Blake remarks that it differs 
from all others in the entire absence of pubescence. As a matter 
of fact the pubescence has simply been rubbed off of the type 
specimen. An examination shows not only the same close arrange- 
ment of minute punctures originall}" bearing the decumbent pu- 
bescence, and sparser larger punctures for the erect hairs, that 
