HENRY J. FRANKLIN. 307 



Worker. — In general much like the queen. Yellow pile of pleura 

 usually reaching the bases of the legs ; yellow patch on basal middle 

 of second abdominal segment in many specimens reaching the apical 

 margin of the segment ; sides of median segment seldom, if ever, with 

 anything but yellow pile. 



Head. Male. — Triangular in outline, as viewed from in front. 

 Face, above and below the bases of the antennae, bearing yellow pile 

 with a more or less strong admixture of black hairs, the black being 

 predominant on many specimens ; occiput with yellow patch usually 

 having no admixture of black hairs ; sides of head behind the eyes 

 usually with a considerable amount of light pile, but in some specimens 

 with black hair only ; pile around upper ends of eyes always black. 

 Labrum not tuberculate, broadly, but not deeply, and transversely 

 concave in front of the middle. Malar space not more than one-fourth 

 as long as the eye ; clypeus pretty well covered up with pile ; fifth an- 

 tennal segment distinctly longer than either the third or the fourth, 

 the third somewhat longer than the fourth. 



Thorax. — Coloration of pile about as in worker, but yellow of pleura 

 always reaching bases of legs ; median segment never with black pile 

 on the sides ; disc of dorsum in majority of specimens with no ad- 

 mixture of black hairs. 



Abdomen. — Dorsum much as in worker but with even a greater ten- 

 dency on the part of the patch of yellow on the basal middle of the 

 second segment to reach the apical margin of the segment ; many speci- 

 mens with the yellow not only reaching the apical margin of the second 

 segment, but also extending outward on each side along that margin 

 and finally even reaching the extreme side margins, leaving only two 

 spots or patches of black pile on the segment and thus justifying the 

 name biniaculatus for the species ; remainder of dorsum as a rule bear- 

 ing only black pile. Venter usually with some black hair, especially 

 toward the base, but for the most part clothed with light pile. 



Genitalia.— Outer spatha about one-third as long (along the middle 

 line from anterior to posterior border) as it is wide (from anterior pro- 

 jection to anterior projection); anterior border broadly incurved or 

 broadly v-shaped ; posterior border rather irregular, distinctly and 

 widely incurved at apical middle ; ventral surface with a somewhat 

 scattering tuft of rather short hairs on each side near the posterior 

 margin, these two tufts being placed on somewhat elevated areas and 

 with scattering hairs between them on a broadly forward curved area ; 

 general appearance somewhat like that of B. vagans Smith (fig. 131). 

 Inner spatha broadly bifid at the apex and with apical portion of the 

 ventral surface rather thickly covered with hair ; general appearance 

 about like that of B. separatus (fig. 127). Claspers about like those of 

 B.fernaldi (figs. 74 and 110). 



Wings. — A trifle lighter than those of the queen. 



TRANS. AM. ENT. SOC, XXXVIII. 



