430 AMERICAN HYMENOPTERA. 



side margins; segments four, five and six entirely black. Venter 

 black. Hypopygium without a median carina. 



Wings. — Rather dark brown ; the fore pair darkest in the region 

 beyond the veins. 



Legs. — Coxae and trochanters mostly dark ; femora with more or 

 less yellow pile on their lower sides ; fore and middle tibiae and cor- 

 bicular fringes dark. 



Worker. — Much like the queen, but the apical margin of the second 

 dorsal abdominal segment often covered with yellow pile, and at least 

 the basal middle brown-ferruginous, pile of this color sometimes 

 covering the entire segment ; segments three and four usually with 

 strong touches of yellow pile on their extreme side margins ; the sides 

 of the median segment usually with pure, or nearly pure, pale yellow 

 pile ; the face, above the bases of the antennae, and the occiput usu- 

 ally with purer yellow pile than in the case of the queen. 



Male. Head. — Face and occiput mostly covered with whitish pile ; 

 cheeks with some whitish pile connecting with that on the occiput. 

 Malar space about one-third as long as wide. Clypeus mostly covered 

 up with whitish pile. Ocelli in the narrowest part of the, vertex, the 

 lateral ones separated by about one-half their own diameters from the 

 margins of the eyes. Third and fifth antennal segments equal in 

 length, the fourth much shorter than either; flagellum about two and 

 three-fourths times as long as the scape. 



Thorax. — Dorsum, pleura and sides of the median segment covered 

 with whitish pile. 



Abdomen. — Dorsum: segments one and two whitish ; the remaining 

 segments mostly dark, but with considerable whitish pile on the sides. 

 Venter with mostly whitish pile. 



Wings. — Much lighter than those of the females ; somewhat stained 

 with brown. 



Legs. — Coxae, trochanters and femora all clothed for the most part 

 with whitish pile ; fore tibiae mostly dark ; middle tibiae mostly dark 

 or with considerable whitish pile on their hind sides ; hind tibiae 

 with outer faces mostly bare, their front fringes short and mostly dark, 

 their hind fringes long and dark or whitish ; hind metatarsi with long 

 and more or less whitish hind fringes. 



Ditnensions. — Length: queen, 17 mm. to 2\\ mm. ; worker, 11 mm. 

 to 17 mm. ; male, about 13 mm. Spread of wings: queen, 41 mm. 

 to 43 mm. ; worker, 26 mm. to 37 mm. ; male, about 34 mm. Width of 

 abdomen at second segment : queen, about 9|mm. ; worker, 5^ mm. 

 to 8 mm. ; male, about 1\ mm. 



This insect is closely allied to separatus, and it is quite 

 possible that it should be considered a subspecies or color 

 variant of that species. 



