418 AMERICAN HYMENOPTERA. 



extreme side margins usually with a little black pile ; segment two 

 usually entirely covered with yellow pile, occasionally with black pile 

 extending up over the extreme side margins a little ; segment three 

 like segment two, but with more of a tendency to have black pile on 

 the extreme side margins ; three apical segments entirely black. Venter 

 black. Hypopygium without median carina. 



lVin£-s.— {Fig. 14)., Dark brown, with extremely slight violaceous 

 reflections ; the fore pair lightest in the apical portion of the third dis- 

 coidal cell and in the region beyond the veins ; hind pair lightest in 

 the basal portion of the second discoidal cell and in the submedian 

 cell. 



Legs. — Coxas, trochanters, femora and tibiae black ; outer faces 

 of hind and middle metatarsi black, except apices, these being ferru- 

 ginous. 



Worker. — Like the queen, but wings usually somewhat lighter and 

 thorax occasionally with a poorly developed black interalar band. 



Male. Head. — Rounded triangular in outline. Face covered with 

 a patch of pale yellow pile, with dark hairs more or less strongly ad- 

 mixed, especially over the clypeus, the black pile often predominant. 

 Occiput with a triangle of pale yellow pile, often with more or less 

 black hairs admixed ; ventro-lateral surfaces of head usually entirely 

 dark, but often with considerable light pile, this connecting with the 

 occipital triangle. Labrum bituberculate somewhat as in queen, but 

 the tubercular areas less marked ; malar space about one-half as long as 

 wide at apex ; clypeus, except area immediately back of anterior border, 

 covered up with pile ; lateral ocelli separated by less than one-half 

 their diameters from the inner margins of the eyes, all three situated 

 nearly half-way from the supra-orbital line to the bases of the antennae. 



Thorax. — Dorsum sometimes entirely yellow, but as often with the 

 disc more or less black, sometimes even with enough black to suggest 

 an interalar band. Mesopleura always covered with yellow pile to 

 bases of legs. Metapleura and sides of median segment sometimes 

 with only dark pile, sometimes with only yellow and sometimes with 

 yellow and dark mixed. 



Abdomen. — Dorsum: first three segments yellow; segment four 

 usually entirely black, but sometimes with a fringe of light hairs on 

 the apical margin ; segment five usually entirely black, but some- 

 times with pale yellow or light ferruginous pile on the sides ; segments 

 six and seven usually entirely covered with ferruginous (of greatly 

 varying shade) pile, but the former sometimes partly or entirely black. 

 Venter very variable, sometimes mostly dark and sometimes mostlj' 

 light. 



Genitalia. — Outer spatha (fig. 100) comparatively long and strongly 

 bilobed at apex, each lobe rather pointed at the end and bearing 

 rather short hairs over its ventral surface ; margin between lobes deeply 



