HENRY J. FRANKLIN. 297 



Boiiibus (Boinbus) streiiiuis Cress. 

 Bombus strenuus Cresson, Proc. Ent. Soc. Phila., II, 1863, p. 102, n. 



28, 9 cf. 

 Cresson, Trans. Amer. Ent. Soc, VII, 1879, p. 231 

 (Catal.). 

 " " Cresson, Syn. Hym. No. Amer., 1887, p. 308. 



Dalla Torre, Cat. Hym., X, 1896, p. 551. 

 ? " frigidtis Ashmead, Proc. Wash. Ac. Sci., IV, 1902, p. 126. 

 ? " " Ashmead, Hym. of Alaska, 1904, p. 132. 



" strenuus H. Friese, Ann. du. Mus. Zool. de I'Acad. Imp. des 

 Sci. de St. Petersbotirg, 1904, Tome IX, no. 4. 



Types. — One queen and the male are in the collection of the 

 American Entomological Society. They are in rather poor 

 condition, the pile on both being matted down quite badly 

 all over. 



Malar space long.. Pile lofig and rather fine. Females with head 

 black ; front part of dorsutn of thorax and scutelluni yellow ; upper two- 

 thirds of mesopleura yellow ; a broad interalar band and the lower parts 

 of the pleura dark ; anterior half of abdominal dorsum yellow, anterior 

 part of posterior half black and apex more or less ferruginous ; wings 

 light ; legs dark. Male, except the head aitd legs, colored much like the 

 female. 



Queen. Head. — Trapeziform. Pile dark brown. Labrum with 

 tubercle-like areas broad and somewhat concaved at their summits, 

 their margins somewhat strongly elevated ; space between these areas 

 and above the shelf-like projection moderately broad. Malar space 

 distinctly longer than its width at apex, fully one-third as long as the 

 eye. Clypeus coarsely, but somewhat sparsely, punctate. Third an- 

 tennal segment longer than the fifth, the fifth longer than the fourth. 



Thorax. — ^Anterior part of dorsum covered with light yellowish pile ; 

 scutellum similarly colored for the most part, but often with some black 

 pile on its anterior part ; a very broad black band between the bases 

 of the wings ; mesopleura somewhat variable, but usually with their 

 upper halves light yellow and lower halves black ; metapleura and 

 sides of median segment with dark brown pile. 



Abdom,en. — Dorsum : three basal segments entirely covered with pile 

 of much the same shade of yellow as that on the anterior part of the 

 dorsum of the thorax ; segment four black, but often with a few ferru- 

 ginous hairs on the apical margin ; segments five and six more or less 

 ferruginous, usually more or less mixed with black. Venter mostly 

 dark brown. Hypopygium with no distinct median carina. 



Wings. — Subhyaline, only slightly stained with brown ; the fore pair 

 darkest in the median and submedian and anterior portion of the radial 

 cells. 



TRANS. AM. ENT. SOC, XXXVIII. (38) 



