132 AMERICAN HYMENOPTERA. 



Thorax. — Dorsum covered with yellow pile, except for black band 

 between bases of wings (this baud is scarcely half as wide from front 

 to rear as it is long from wing base to wing base, and, in some cases, 

 it is not well defined, there being a more or less strong admixture of 

 yellow hairs with the black). Mesopleura with yellow pile extending 

 down from front part of dorsum to some distance below level of bases 

 of wings, but for most part clothed with black pile. Metapleura and 

 sides or median segment entirely dark. 



Abdometi. — Third dorsal segment clothed with yellow pile, otherwise 

 entirely dark. Hypopygium without a median carina. 



JVing'S. — Very dark, with strong violaceous reflections. 



Leg's. — Entirely black or brown. Hind margins of posterior meta- 

 tarsi rather evenly arcuate from base to apex. 



Worker. — Like the queen, but with somewhat lighter wings. Cly- 

 peus sparsely punctate, with mostly coarse punctures. 



Male. Head. — Face, for most part, clothed with cinereous pile (this 

 pile is a mixture of long dark brown hairs and shorter whitish pile or 

 down). Occiput covered with a triangle of nearly pure yellow pile. 

 Sides of head mostly dark. Malar space fully as long as its width at 

 apex, nearly one-third as long as eye. Clypeus, except on middle of 

 front portion, largely covered with cinereous pile. Third and fourth 

 antennal segments subequal in length, the fifth longer than either. 



Thorax. — Coloration of dorsum like that of queen and worker, but 

 the black interalar band very poorly defined, there being a very strong 

 admixture of yellow hairs with the black. Yellow on upper portions 

 of mesopleura extending far below level of bases of wings ; their lower 

 portions, however, dark. Extreme end of metanotum bearing a tuft 

 of yellow hair behind the base of each hind wing. Metapleura and 

 sides of median segment dark. 



Abdomen. — Dorsum: segment one entirely dark ; segment two dark, 

 except for a small amount of yellow pile on each hind corner ; segment 

 three clothed entirely with yellow pile ; segment four mostly dark, but 

 with some yellow hair on basal margin, especially at sides; segments 

 five and six black. Venter black. 



Genitalia (figs. 184 and 187). — Apices of branches, as seen from 

 dorsal side, acute angled on side toward median plane of body. Vol- 

 sellae with apical projections much broader and more quadrangular 

 than usual. Squamae greatly elongated and somewhat curved, with 

 tips blunt pointed, reaching considerably beyond tips of volsella;, and 

 curving around behind ends of sagittte ; the inner lobe absent. Sagitta; 

 with shafts distinctly bent outward in middle ; heads very elongate 

 foliaceous and downward curved, with very tips narrowed and curved 

 mesad somewhat and with outer margins almost entii-e, only very 

 slightly serrate. 



Wings. — Considerably lighter than those of queen, without notice- 

 able violaceous reflections. 



