268 
NORTH AMERICAN MYRMOSIDAE 
Head shining, with a few small punctures; ocelli very large and prom- 
inent, without a transverse impression behind and only a faint longi- 
tudinal impression between them, measurements: .4 mm., .25 mm., .53 
mm.; forehead with a row of four small tubercles above the antennae, 
the two inner sharj) and tooth-like, the two outer slightly transversely 
elongated; inferior margin of the antennal sockets with a downward 
projecting thickened fold; edge of the clypeus emarginate, thickened, and 
sloping; the surface above it strongly elevated; mandible with the inner two 
teeth of equal size, a strong curved carina extending from the innermost about 
half way to the base; gular orifice broad, its slightly re flexed lateral margin 
distant from the eye by about the length of the last segment of the labial 
palpi, and from the swelling at the base of the mandibles by considerably less 
than the thickness of the same; antennae not or scarcely' crenulate. 
Humeral angles rounded and indistinct; pronotum dorsally sparsely punc- 
tured, still more sparsely on the sides; mesonotum polished, shining, bearing 
very sparse small punctures and distinct lateral grooves which are rather 
deeply depressed in front of the scutellum; the latter convex, its disc with 
sparse punctures, its sides with minute punctulation; postscutellum sub- 
tuberculate, medially impunctate, laterally bearing small punctures and some 
minute punctulation; mesopleura swollen but not irregularly nor rugosel}’ so, 
sparsely punctured, the punctures smaller and much sparser posteriorly and on 
the sternum; each mesopleurum bears a small pit anterior to the upper part 
of the posterior Ijorder; dorsal surface of the propodeum polished, impunctate, 
and without sculpture, not separated by a carina from the strongly declivous 
posterior face; the lateral faces, excei)t above, polished and impunctate, the 
posterior and upper part of the lateral faces roughened by reason of bearing 
erect hairs. 
Wing venation as shown in figure 13. 
Anterior metatarsus with two short spines on its inner surface; middle tibia 
with a group of stout subapical spines on its outer surface; posterior tibia 
with a row of about four stout spines on its posterior margin. 
First abdominal segment moderately short, not much thickened posteriorly, 
with a distinct but short anterior neck, its sides consideralily roughened by the 
insertion of numerous hairs; second ventral segment without carinae; surface 
of abdomen polished and with only minute setigerous punctures; pygidium 
narrowed and truncate posteriorly, with indistinctly margined sides, a slightly 
raised, median, smooth fold, and a few coarse lateral punctures. 
Sagitta long, slender, tapered and turned upward toward the apex; volsella 
reduced to a very small chitinous button; ramus with its posterior upper 
angles not produced, turned inward; the inner surface of the ramus with a 
brush of hairs; squama rather slender, bluntly tapering, without a differentiated 
or notched posterior border; uncus as seen from the side arched downward, 
from above strongly compressed, flaring into an oval head at apex, the tip 
deei)ly and sciuarely notched. 
Ty'f)e material. — Holotype: Coalinga, Fresno County, Cali- 
fornia, below 500 ft. elevation, June 1-3, 1907, (the author), 
