270 
NORTH AMERICAN MYRMOSIDAE 
like that of the rest of the abdomen, with only si)arse, minute, setigerous punc- 
tures; pygidium tapered, slightly notched at apex, its sides margined so far 
ventrad as to appear immargined from a dorsal view; polished, with uniform 
surface and almost impunctate. 
Sagitta blade-like but short, thick, and l)lunt; volsella reduced to a basal 
disc; ramus oblique, its posterior margin sinuate, the ujiper posterior angle not 
produced, rolled broadly inward; a brush of hairs on the inner side; squama 
without notched posterior margin; uncus as seen from the side strongly curved, 
long, somewhat widened toward the obtuse tip; as seen from above, it is 
strongly compressed, flaring at aj)ex, the extreme apex slightly notched 
(figures 41 and 42). 
Type material. — Holotype: Calexico, Imperial County, Cali- 
fornia, August 11, 1914, (the author), [Cornell University, No 
121.1]. Two paratopotypes, same date, [Cornell University, 
Nos. 121.2 and 121.3]. 
From B. eriopis, which is perhaps its closest ally, areyiivaga may 
be known by its smaller size, and by having only two small spines 
on the anterior metatarsus, instead of five preapical spines in two 
rows. The short sagittae distinguish the species from all the 
others in its group whose genitalia have been examined. 
Brachycistis (Brachycistis) ampla (Blake), cf. 
Colorado: [Types, American Entomological Society]; Fox gives also, 
Caster, (T. D. A. Cockerell). 
Brachycistis (Brachycistis) protracta new species . 
cf. Castaneous, the base of the abdomen a little lighter, the legs shading 
into yellow, the antennae yellowish brown; clothed with sparse, rather long, 
nearly white pubescence; wings hyaline; the veins of various shades of 
brown; Sc -]- R -]- M and the stigma dark brown. Length, 20 mm. 
Head .43 wider (width 2.66 mm.) than the least distance between the 
tegulae (1.85 mm.) ; head polished, shining, with a very few minute punctures; 
ocelli large, prominent, a weak impressed line behind but none between them; 
their measurements: .43 mm., .25 mm., .6 mm.; forehead above the base of 
the antennae with four raised points, the inner two inconspicuous; the lower 
margin of each antennal socket thin, without a downward projecting tubercle; 
clypeus nearly flat, its margin forming a depressed crescent, at the middle of 
the base of which is a wholly inconspicuous tubercle; mandible with its inner 
tooth somewhat smaller than the intermediate, the carina straight and extend- 
ing only half way to the base; gular orifice small, its lateral margin elevated 
into a thin, angvdarly prominent carina, distant from the eye by about the 
length of the last segment of the labial palpus, and from the swelling at the 
condyle of the mandible by nearly twice the thickness of the same. Antenna 
long and slender, cremdate toward its apex, the basal segment of the flagellum 
.15 mm. thick and 1.28 mm. long, seven gnd one-half times the length of the 
pedicel. 
