JAMES CHESTER BRADLEY 
271 
Humeral angles wanting; pronotinn polished, shining, with very sparsely 
and irregularly scattered minute punctures; mesonotum similarly sculptun'd, 
deei)ly impressed just in front of the scutellum; lateral lines distinct; disc of 
the scutellum with a few punctures, polished, shining, its sides, as also those of 
the postscutellum, closely and minutely punctulate; disc of postscutellum 
without punctures; mesoi>leura obliquely elongate, not strongly swollen and 
without appreciable rugosity, a small j)it at quite a distance cei)halad of the 
upper part of the posterior border, the surface })olished, shining, with very 
sparsely l)ut rather regularly scattered minute punctures; propodeum low and 
very elongate, with no aj^preciable posterior face, its surface smooth, polished, 
impunctate and without sculpture except for the few minute punctures from 
which hairs arise caudally and laterally. 
Stigma long, rather narrow, cell 2 d Ri + R 2 extending beyond the apex of 
the stigma by about the width of the same; cell R 4 large, about as long as 
high; K 5 opposite the radial cross-vein; r-m inserted on iM slightly nearer to 
M 3 -4 than to m-cu. 
Anterior metatarsus with a few spines on its inner surface; middle tibia with 
very strong spines on the apical half of its outer surface, the stoutest being on 
the posterior edge; i)Osterior tibia with five or six stout si)ines on its margin. 
Abdomen long petiolate, the first segment as viewed from the side, evenly 
and but slightly enlarged posteriorly, four times as long (,3. 2 mm.) as its great- 
est dorso-ventral thickness (.8 mm.) ; viewed from aliove it is more appreciably 
thickened, with a median longitudinal depression just before the apex; 
abdomen polished, shining, with only sparse and very small setigerous punc- 
tures; pygidium flat, obtusely truncate, with ill-defined margins, and a few 
coarse punctures on its sides. 
Sagitta long and slender, acute, reaching nearly to the tip of the uncus; 
volsella reduced to a small chitinized button; ramus short but very broad, its 
superior hind angle not at all produced, entirely rounded and turned inward, 
a brush of stout bristles on the inner surface; squama slender, acute, posterior 
margin not differentiated from the inferior, and not notched; uncus slender, as 
seen from above compressed, widened at the apex, l)ut with a thin flaring in- 
ferior margin, stopiiing abruptly short of the base, the apex deeply notched. 
Type. — Phoenix, Arizona. [American Entomological Society.] 
This is the largest knowti species of Brachycistis. 
It finds its nearest relative in ampins Cresson, the two being 
distinguished from all others l)v their long slender petioles and by 
their long, low, and rounded propodea. 
Brachycistis i Brachycistis 1 gaudii Cockerell, cf. 
1901. Brachycistis gaudii Cockerell, Can. Ent., 33: 340, cf. 
1903. Brachycistis gaudii Melander, Trans. ,\mer. Ent. Soc., 29: 329, o'. 
Illustration of forewing, ))1. IV, fig. G4. 
TRANS. AM. ENT. SOC., XLIII. 
