JAMES CHESTER BRADLEY 
269 
[Cornell University, No. 120.1]. Three paratopotypes, same 
date. Two para types from the Jacintas Barranca in the Kettle- 
man Plains, Fresno County, California, June 4, 1907. As this 
locality is within a few miles of Coalinga the two latter are also 
to all purposes paratopot}'pes. [Cornell University, Nos. 120.2 
to 120.6.] 
The description of the genitalia is from a paratype. 
This species finds its closest relatives in nitidus and eriopis, ivom 
which it is differentiated bj" the characters given in the key. 
Brachycistis (Brachycistis) arenivaga new species 
d' . Brownish orange; legs and antennae yellow; head reddi.sh black; 
clothed with sparse, erect, yellow pubescence; wings hyaline; Sc -f R + i\I 
brown, the other veins translucent yellow, the stigma golden yellow. Length, 
S mm. 
Head with few minute punctures; ocelli large, prominent, a faint impressed 
line Ijehind them, obsolete medially, and a faint longitudinal impression be- 
tween them; measurements: .2.5 mm., .21 mm., ..38 mm.; front medially prom- 
inent above the antennae, but without tubercles, except two vague lateral 
ones; lower rim of each antennal socket simple; ch'peus slightly elevated 
mediall}', its surface nearly glabrous, polished, the edge emarginate medially, 
not thickened; mandible with its middle tooth smaller than the inner and more 
or less fused with it, the carina prominent, extending half waj' to the base; 
gular orifice small, its sides scarcely margined, removed from the eyes by more 
than the length of the last segment of the labial palpus, and from the swelling 
at the condyle of the mandible Iw about one and one-half times the thickness of 
the same. 
Humeral angles wanting; pronotum sparsely and minuteh' punctured, 
laterally almost impunctate; mesonotum polished, with few minute punctures, 
depressed in front of the scutellum, the lateral grooves well marked; scutellum 
convex, its disc almost impunctate and polished, its sides with numerous 
smaller punctures; postscutellum impunctate, its sides without the usual 
minute punctulation; mesopleura with the surface regular, polished, almost 
impunctate, the punctures being very few, small, and shallow; each meso- 
pleurum bears a pit in front of its posterior margin; propodeum polished, im- 
punctate above, with a faint median impressed line, the hind surface steeply 
declivous, beset with hairs, not separated from the dorsal surface, the posterior 
lateral angles rounded, not prominent, the sides polished, imiJimctate. 
^^'ing venation as shown in figure 16. 
Anterior metatarsus without a row of spines, although there are two in- 
conspicuous spines on its inner surface; middle tibia with a few feeble sjjines 
on the apical part of its outer surface, largely concealed; posterior tibia 
without spines. 
First abdominal segment short, dorsally entire^ sessile with the second, en- 
larged directly from the base, without an anterior neck, its surface polished 
TRANS. AM. ENT. SOC., XLIII. 
