63 
Color of head above clypeus except triangle below antenna?, orbits, 
more or less of antenna? above, center of lobes of mesonotuin more or 
less of scutellum, lower half of mesepimera, metepisterna, extreme 
tips of posterior tibia?, posterior tarsi, and tip of sheath brownish black; 
balance of body and legs luteous; mouth parts, coxa 4 , and trochanters 
pallid. 
Male. — Length 6 mm.; body short, robust, in general as in female; 
clypeus scarcely emarginate, slightly produced at center, giving trilo- 
bed appearance; antenna? more robust than in female, joints 3 to 5 sub- 
equal; procidentia very broad, as broad as long, constricted at base; 
hypopygium very much narrowed toward apex, which is obtusely 
rounded. Color of head above clypeus, thorax, including all of epi- 
mera, basal plates, more or less of central dorsal area of abdomen, and 
extreme bases of posterior coxa' brownish black ; antenna?, tips of poste- 
rior tibia? and their tarsi, veins, and stigma brownish; antenna? lighter 
beneath ; mouth parts, pronotum tegulae, base of costa, legs, abdomen 
beneath, and more or less of lateral dorsal region luteous; orbits, 
lateral lobes, mesonotuin, and basal edges of scutellum more or less 
tinged with rufous. 
Twelve females and five males, from Canada to Missouri. (Colls. U. S. 
Nat. Mus. and Am. Ent. Soq.) 
28. Pteronus edwardsii Cresson. 
1880. Nematus edwardsii Cressou. Trans. Am. Ent. Soc, vin, p. 7. 
Female. — Length 5.5 mm.; robust, shining; clypeus very slightly emar- 
ginate, almost truncate, lobes very broad ; frontal crest and sides of ocel- 
lar basin indistinctly elevated, vertex nearly smooth ; antennal fovea 
broad, triangular, shallow; antenna? tapering, almost as long as the 
entire body, joint 4 slightly longer than 3; intercostal vein posterior 
to basal, very little inclined; upper middle cell of hind wings very little 
exceeding lower; stigma elongate, acuminate; sheath very broad, short, 
obtusely pointed; cerci rather robust, tapering. Color of head and 
thorax except basal plates, posterior tarsi and tips of posterior tibia 4 , 
sheath, and cerci brownish black, tinged with rufous — the latter color 
occurring on the pronotum, teguke, lateral margin of lobes of meso- 
notum, sides of scutellum, and upper half of mesepimera; spot below 
antenna?, clypeus, labrum, palpi, legs, and abdomen, including basal 
plates, yellowish ferruginous; antenna? uuicolorous, black; wing veins, 
including stigma and costa, brownish. 
One female, Cresson's type. Marin County, Cal. (Coll. Am. Ent. Soc.) 
29. Pteronus militaris Cresson. 
1880. Nematus militaris Cresson. Trans. Am. Ent. Soc, vm, p. 7. 
1886. Nematus militaris Provancher. Add. Faun. Can. Hym., p. 23. 
Female. — Length 7 mm.; exp. al. 14 mm.; moderately robust, shining; 
clypeus deeply notched, lobes narrow; frontal crest prominent, some- 
