HENRY J. FRANKLIN. 133 



Legs. — Pile all dark. Hind tibiae with outer faces convex and hairy 

 throughout, though rather sparsely so toward distal ends ; fore and 

 hind fringes not very long and not forming corbiculse. Hind meta- 

 tarsi with outer faces distinctly concaved, without long fringes. 



Diyneiisions. — Length: queen, 21 mm. to 25 mm. ; worker, 12 mm. 

 to 18 mm. ; male, about 15 mm. Spread of wings: queen, 47 mm. 

 to 49 mm. ; worker, 30 mm. to 38 mm. ; male, about 35 mm. 



Habitat. — Peru (Callanga and Chanchamayo); Chiriqui 

 (Boquete); British Guiana (Georgetown); Surinam; Para- 

 guay (Sapucay); Brazil (Rio Grande do Sul). 



This species is apparently related to viedius, niger, pullatiis 

 and atr-atus. Most of the workers before me and the male 

 have been immersed in some liquid, the pile being badly 

 matted and the yellow being faded out to a pale straw color. 

 The yellow of all specimens in good condition (including 

 most of the queens and two of the workers) is a fairly deep 

 rich yellow. 



The queen and worker of this species may be separated 

 from the females of ynedius by the difference in the arcuation 

 of the hind margin of the posterior metatarsi. Medhis has this 

 margin more suddenly arcuate toward the base than does 

 incarum, the latter species having it more nearly evenly arcu- 

 ate from base to apex. Furthermore, the black interalar 

 band of mcditis is more than half as wide, from front margin 

 to rear margin, as it is long, from wing base to wing base, 

 which is not the case with incarum. The male of incariim 

 may be readily separated from all other males known to me 

 by means of the greatly elongated squamae of its genitalia. 



Boiubus (Bombus) sououiie Howard. 

 Bombus sononus Howard, Insect Book, 1904, Plate 2, fig. 7, 9 . 



Type. — The queen which Dr. Howard figured is the type 

 of the species. I here describe the queen from eight speci- 

 mens, seven of which, including the type, are deposited in 

 the collection of the United States National Museum and 

 one in the collection of the Massachusetts Agricultural Col- 

 lege. The worker is described from six specimens (cotypes 

 of this caste), of which one is deposited in the collection of 

 the Massachusetts Agricultural College and five in the col- 



TRANS. AM. ENT. SOC, XXXIX. 



