HENRY J. FRANKLIN. 279 



(these black tufts are over the margin of the apparent dorsum of the 

 abdomen, and may be best seen by looking at the insect from the side 

 and somewhat in front, letting the line of vision pass under the wings 

 at what appears to be the anterior face of the abodmen); second dor- 

 sal segment with the extreme sides and apical margins covered with 

 yellow, the rest with brown ferruginous pile ; translucent spots of 

 labrum smaller than in queen, in some specimens absent ; mandibles 

 very variable, sometimes four and sometimes five toothed (figs. 37, 

 39, 40 and 41). 



Male. Head. — Shaped much like that of queen. Bearing other than 

 black pile only on the occiput. Occiput sometimes all black, but usu- 

 ally with a more or less strong admixture of yellow hairs ; in some 

 specimens with yellow pile predominating and not much black hair 

 intermixed. Labrum broadly indented from side to side in front of 

 the middle ; surface rather coarsely punctate. Malar space about as 

 long as its width at the apex ; clypeus pretty well covered up with 

 pile ; antennae rather short and stubby for male Bombus, the fifth seg- 

 ment slightly longer than third, fourth distinctly shorter than either. 



Thorax. — Coloration of pile like that of the worker. 



Abdomen. — Coloration of pile about like that of worker. 



Genitalia. — In most respects like those of the other species of the 

 terrestris group ; the prominent tooth-like projection at about the 

 base of the lower side of the head of the sagitta much broader than 

 in B. occidentalis and serrate at its tip (fig. 121). 



Wings. — In general like those of the queen and worker, but much 

 lighter, the basal three-fourths of the fore wings being scarcely stained 

 with brown. 



Legs. — Trochanters usually with black pile only, sometimes with a 

 very slight admixture of yellow hairs ; femora with only black pile ; 

 tibiae with black pile and rusty tips on the outer side. Posterior tibiae 

 with distinct and rather deep corbiculae, the fringing hairs bordering 

 an entirely bare area ; outer surface flat or very slightly convex. Poste- 

 rior metatarsi rather broad, concave on outer side, with curved poste- 

 rior border and bearing rather short spines, pubescence and hair. 



Dimensions. — Length : queens, 15 mm. to 21 mm. ; workers, 9 mm. 

 to 15 mm. ; males, 11 mm. to 17 mm. Spread of fore wings : queens, 

 37 mm. to 43 mm. ; workers and males, 23 mm. to 36 mm. Width of 

 head : queen, 5 mm. to 6 mm. ; worker, ?>\ mm. to 5 mm. ; males, 4 

 mm. to 5 mm. Width of abdomen at second segment : queens, 8 mm. 

 to 11^ mm. ; workers and males, 6 mm. to 9 mm. 



Habitat. — This species is present in southeastern Canada, 

 though apparently one of the rarer species there. It is not 

 very common in northern New England, but apparently 

 grows much more so southward. In southern New England 



TRANS. AM. ENT. SOC, XXXVIII. 



