EOS xe North American Pachygasterine — . 309 
—- “ Berkshiria albistylum sp. nov.” 
“Black; -front shining, the two ridges forming deep central and 
orbital grooves, ocelligerous tubercle prominent; face receding, the 
orbits white; antenna yellow, arista white with its basal fourth black. 
Thorax sparsely covered with a whitish pubescence; humeri angulate 
with a small yellow spot at each point, a raised collar extending between 
the humeri, and a blunt spine on each side before the base of the wing. 
Abdomen broad, about double the width of the thorax, the five segments 
shining, sparsely covered with whitish hairs. Halteres white, base of 
the knobs and stems brown. Legs black, knees, tips of the tibize and 
the tarsi yellow, the last two joints of the latter brownish. Wings 
hyaline, veins: yellowish, three veins ‘extending from the discal cell. 
Length, 4 mm.” | 
I have not seen the species. Except in the absence of the 
fork of the third vein it must very closely resemble Johnson- 
omyta aldricht, described in the present paper. 
Nothing is known of the early stages, and no indication 
of the sex of the type is given in the description. 
Zabrachia Coquillett. 
This genus was erected for the reception of a single species, 
polita Coquillett.* It is distinguished from all other North 
American genera of this group of the subfamily except Berkshiria 
by the absence of the fork of the third vein. From Berkshiria 
it is distinguished by the structure of the antennae, those of 
Zabrachia being short and the third joint disc-like, while in 
Berkshiria they are elongated, and the third joint noticeably 
longer than broad. 
Zabrachia polita Coquillett. 
Male—Glossy black. Antennz yellow, arista brown. Legs yellow, 
coxe and femora black, apices of latter yellow. Wings clear, veins 
grayish. Halteres black. 
Head in profile (Fig. 3) slightly higher than long, eyes covering the 
entire side, ocellar region slightly raised; eyes bare, contiguous above, 
leaving only the ocellar and supra-antennal triangles visible, upper 
eye-facets distinctly larger than lower, separated by a distinct trans- 
verse line slightly above base of antennze; antennze short, complex joint 
disclike; arista short, bare, and hairlike; proboscis of moderate size. 
Mesonotum finely and rather closely punctured, surface hairs very 
short, dark; scutellum with disc as that of mesonotum, a distinct 
depression near margin, giving it the appearance of having a marginal 
rim, the base appreciably swollen, the whole in profile with an upward 
*Bull. 47, N. Y. State Mus., 1901, p. 585. 
