JAMES CHESTER BRADLEY 
longitudinal, strongly raised fold, a few moderate punctures in the depressed 
area between this fold and the margin. 
Sagitta much reduced, strongly chitinized, its tip transversely truncate, 
thickened and tricuspid; volsella a very small, compressed, strongly chitin- 
ized, oval plate; ramus large, broad, its apex deeply emarginate, its upper 
posterior angle acute, its inner surface without a hirsute patch, l)ut with an 
oblique row of ciliae; squama, by reason of a deep posterior notch, bifurcate, 
the upper prong slender, acute; uncus rather short, much thickened before 
and acute at the apex, not at all notched (figures 24, 25 and 26). 
In one paratype the vein r-m is almost opposite m-cu. 
Type material. — Holotype: Nogales, Arizona, June 21, 1903, 
(E. J. Oslar), [Cornell University No. 124.1]. Four paratypes: 
Arizona, [American Entomological Society and Cornell Univer- 
sity, No. 124.2]. 
This species finds its closest relatives in castanea, crassa and 
thermarum. The peculiar tricuspid sagittae I have not observed 
in any other species. Its general appearance distinguishes it at a 
glance from any other species of the genus. 
Brachycistis (Brachycistis) crassa new species 
cf. Brovuiish orange; femora orange; tibiae and tarsi yellow; wings 
stained slightly yellowish, the veins and stigma light brovm; clothed with 
sparse yellowish pubescence. Length, 13 mm. 
Head polished, shining, with punctures small and scattered; ocelli large, 
prominent, their measurements: .3 mm., .4 mm., .6 mm.; a weak longitudinal 
impression between the posterior ocelli, but no transverse line behind them; 
middle of the forehead above the base of the antennae elevated, without tuber- 
cles or carinae; inferior margin of each antennal socket thickened and pro- 
duced into a strong triangular tubercle projecting downward; clypeus not 
tuberculate, elevated toward the apex, with thick and slightlj' emarginate 
margin; mandible with the inner two teeth strong, of equal size, a compara- 
tively weak Carina extending from the inner one about half waj' to the base; 
gular orifice small, its lateral margin removed from the eye by more than the 
length of the last segment of the labial palpus, and from the globular swelling 
at the condyle of the mandible by about twice the apparent width of the same. 
Antennae noticeably crenulate toward their apices. 
Pronotum with unusually prominent, but not sharp, humeral angles, closely 
and coarsely punctured, the rest of its surface sparsely punctured; meso- 
notum polished, shining, with few punctures, and deeply impressed lateral 
grooves; scutellum with its disc sparsely punctate, laterally and posteriorly 
closely punctate as is also the postscutellum ; mesoplcura closely punctured, 
the punctures becoming sparse on the sternum, the surface irregular by reason 
of a superior wen, ending posteriorly in a chitinous tubercle; superior face of 
the propodeum impunctate, glabrous, and polished, with a longitudinal median 
bottle-shaped furrow, the dorsal face separated from the posterior by a sharp 
TR.\NS. AM. ENT. SOC., XLIII. 
