HENRY J. FRANKLIN. 89 



Legs. — Dark ; the middle trochanters often with considerable pale 

 yellow pile on their lower sides. 



Male. Head. — Face with a large amount of yellow pile, the yellow 

 more or less intermixed with black hairs and placed, for the most part, 

 below the bases of the antennae, being most conspicuous on the cly- 

 peus and strongly predominating there over the black ; some yellow 

 hairs intermixed with the black just above the bases of the antennae. 

 Occiput with a mixture of black and yellow pile, the black predomi- 

 nating. Ventro-lateral portions of head with a considerable amount 

 of pale yellow hair. Mandibles with heavy ferruginous beards. Malar 

 space about as long as its width at the apex, about one-sixth as long 

 as the eye. Clypeus rather densely covered, for the most part, with 

 mostly yellow pile. Third and fourth antennal segments subequal in 

 length, the fifth much longer than either. 



Thorax. — Coloration of pile much like that of worker, but the very 

 front part of the dorsum and the hind margin of the scutellum usually 

 with a more or less conspicuous admixture of yellowish hair. 



Abdomen. — Dorsum : coloration of pile much like that of worker, 

 but the yellow patch on the second segment somewhat larger, only the 

 extreme sides of that segment being dark. Venter mostly dark, but 

 with apical fringes of most of the segments yellow. 



Genitalia. — Outer spatha much like that of B. vagans (fig. 131). 

 Inner spatha much like that of B. itnpatiens (fig. 133). Claspers (fig. 

 177 and fig. 190) with apices of branches broadly rounded, as seen 

 from dorsal side ; squamce single lobed, triangular, with the outer 

 margin evenly outcurved from base to apex, and the inner margin 

 evenly incurved in the middle, but outcurved in front and behind, 

 the apex round pointed, the base only slightly wider than the apex of 

 the branch ; volsellse long and slender, somewhat wider in middle than 

 at apex, and with small apical projections. wSagittae with the usual 

 long shafts and sickle-shaped heads of the Pratorum group. 



Wings.— "Like those of the worker. 



Legs. — Hind coxae with much yellow pile on their outer sides. All 

 the trochanters with much yellow hair below. The hind femora, and 

 sometimes also the front ones, with a considerable amount of yellow 

 pile on the lower sides of their basal portions. Tibiae all dark, except 

 for some ferruginous-yellow hairs mixed with the black in the hind 

 fringe of the corbiculae. Outer faces of hind tibiae slightly convex and 

 naked, except for a few scattering hairs; hind fringes long and front 

 ones moderately so, forming rather distinct corbiculae. Hind meta- 

 tarsi with moderately long hind fringes, at least toward their basal 

 ends ; their outer faces nearly fiat and with pubescence of two dis- 

 tinctly different lengths intermixed, the longer hairs being the more 

 sparse. 



Dimensions .—Lieu^ih. : queen, 16 ram. to 19 mm. ; worker, 9 mm. 



TRANS. AM. ENT. SOC, XXXIX. (12) 



