HENRY J. FRANKLIN. 471 



The black hair on certain portions of this insect, espe- 

 cially on the abdomen, is tipped slightly with brownish. 

 I think that this species is the female of stickleyi. 



Psithyrus suckleyi (Greene). 

 Bombus suckleyi Greene, Ann. Lye. Nat. Hist. New York, VII, 1860, p. 



169, n. 1, cf . 

 Apathus insularis Cresson, Proc. Ent. Soc. Phila., II, 1863, p. 113, cf, 



var. a. (Probably a misidentification.) 

 Psithyrus interruptiis Dalla Torre, Cat. Hym., X, 1896, p. 569 (pars.). 

 " consultus Fletcher and Gibson, Can. Ent. Rec. (Ann. Rep't 

 Ent. Soc. Ont.), 1908, p. Ill (pars). 



Type. — From Puget Sound. Probably lost. 



Face dark ; occiput with considerable yellow pile ; cheeks dark ; dor- 

 sum of thorax yellow, with a narrow black interalar band ; pleura yel- 

 low ; dorsum of abdomen with first segment yellow, second segment dark 

 on the sides and usually along the apical margin, but yellow in the middle, 

 at least on the basal portion, third segment sotnetim,es entirely yellow, ex- 

 cept for dark pile on the anterior cor?iers, and som.etimes dark in the m.id- 

 dle and along the front m,argin also, fotirth segm.ent mostly yellow, fifth 

 and sixth segments dark in the middle and yellow on the sides, seventh 

 segment dark ; venter dark in the middle, with considerable yellow hair 

 on the sides ; legs tnostly dark. 



Female. — I believe that latitarsus is the female of this species, but 

 have been unable to definitely prove that such is the case, though I 

 have evidences as follows : (1.) The known habitats of latitarsus and 

 suckleyi are nearly the same. (2.) The male of ashtoni is evidently the 

 closest relative of suckleyi, as shown both by structure and by colora- 

 tion, and the female ashtoni is structurally most like latitarsus. 



Male. Head. — Face black, often with an admixture of yellow hairs 

 above the bases of the antennae ; occiput with a triangular patch of 

 yellow pile, often with dark hairs admixed ; cheeks dark. Malar space 

 shorter than its width at the apex, hardly one-fifth as long as the eye. 

 Clypeus clothed with black pile. Flagellum of antenna nearly three 

 times as long as the scape ; third and fifth antennal segments subequal 

 in length, the fourth distinctly shorter than either. 



Thorax. — Dorsum yellow, with a narrow and rather poorly defined 

 black band between the bases of the wings ; mesopleura mostly covered 

 with yellow pile to the bases of the legs ; metapleura with considerable 

 yellow pile ; sides of the median segment mostly dark, but often with 

 considerable light hair admixed. 



Abdom.en. — Dorsum: segment one yellow; segment two yellow in 

 the middle and dark on the sides, often dark also along the apical 

 border ; segment three usually with mostly yellow pile, but usually 



TRANS. AM. ENT. SOC, XXXVIII. 



