1915] North American Pachygasterine 313 
thornlike scutellum; the basally constricted abdomen; and 
the very slender legs. The general habitus of the species 
formiceformis is entirely different from that of the two other 
genera under discussion. 
The known distribution of the three genera is as follows: 
Eucyntpimorpha minuta Williston, Chilpancingo in Guer- 
rero, Mexico. 
Cynipimor pha bilimeki Brauer, Cuernavca, Orizaba, Mexico. 
Lyprotemyia formiceformis Kertez, Meshagua, Urubam- 
bafluss, Peru. 
Nothing is known of the life history of any of the genera. 
Johnsonomyia, n. gen. 
Male—Eyes contiguous; ocelli on a raised knob; antenne elongate, 
flagelum distinctly longer than broad, arista apical, densely short- 
haired, insertion of antennz slightly above middle of head in profile; 
orbits indistinguishable in profile. Scutellum similar to that of 
Eupachygaster. Abdomen short and broad. Apex of stigma proximad 
of apex of discal cell; third vein forked; discal cell emitting three veins. 
Female—Eyes widely separated above; antennz rather larger than 
in male, and arista more conspicuously haired. 
Type of genus, Johnsonomyia aldrichi n. sp. 
Johnsonomyia aldrichi, n. sp. 
Male.—Black, shining. Antenne dark brown, basal two joints of 
flagellum yellow; arista white, blackish at base; frontal triangle black, 
with a small silvery pilose spot on each side below; a silvery line 
extending along eye margin from base of antenne to posterior orbits; 
face glossy black; proboscis brownish; hairs on vertex and lower 
portion of head black. Hairs on thorax black, those on disc appearing 
slightly brownish when viewed at certain angles. Hairs on abdomen 
white. Legs blackish-brown, knees, apices of tibiz, and basal four 
joints of tarsi yellow. Wings clear, veins yellow. Halteres black, knob 
grayish brown. 
Frontal triangle very small; eyes touching, facets becoming slightly 
smaller on lower half; antennal flagellum consisting of five joints, arista 
densely clothed with short hairs; sides of face and the cheeks diverging 
below; profile as in figure 15. Hairs on disc of mesonotum upright and 
-of moderate length, those on scutellum shorter and very closely placed; 
thoracic suture very distinct on disc, forming 2 rather conspicuous 
cavities which run diagonally backward to middle of mesonotum and 
do not join, being narrowly separated on the median line; outline of 
scutellum very much like that of Eupachygaster punctifer, differing in 
having the apical production slightly upcurved and the small marginal 
thorns (4) confined to the apex (Fig. 5). Segments of abdomen closely 
fused, the divisions hardly perceptible; surface with short decumbent 
