HENRY J. FRANKLIN. 161 



Queen. — This caste is unknown to me. Friese states that in colora- 

 tion it is like the worker, but that it is "nearly the size of dahlboinii,^^ 

 reaching a length of 26 mm. 



Worker. Head. — Of medium length. Pile on face and occiput very 

 dark cinereous. Pile on sides of head behind eyes mostly very dark 

 cinereous, but rather strongly ferruginous underneath toward bases of 

 mandibles. Malar space fully as long as its width at apex, very nearly 

 one-fourth as long as eye. Clypeus smooth and shining, rather sparsely 

 and, for most part, very delicately punctate. Ocelli practically on 

 supra-orbital line, above narrowest part of vertex. Third antennal 

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



Thorax. — Dorsum covered entirely with dark ashen gray pile. Meso- 

 pleura from level of bases of wings to bases of legs covered with fer- 

 ruginous pile. Metapleura and sides of median segment also clothed 

 with ferruginous hair. 



Abdomen. — Dorsum: segment one ferruginous; segments two and 

 three dark fuliginous, but with considerable ferruginous pile on the 

 extreme sides and also with that color sometimes mixed in somewhat 

 with the fuliginous in the middle ; segments four and five ferruginous; 

 segment six mostly dark, but fringed with short ferruginous hair. 

 Venter with mostly pale ferruginous pile. Neither epipygium nor 

 hypopygium carinate. 



IVings. — Very strongly infuscate, dark for a Bombiis worker ; the 

 fore pair with a slight violaceous reflection. Transverse median vein 

 of fore wings usually nearly straight (not curved noticeably, as in 

 most species of the subgenus Bombiis) and not coalescing at base with 

 base of discoidal, yet forming an obtuse inner angle with the me- 

 dian vein (but this angle is less obtuse than is usual in the subgenus 

 Bombus) . 



Legs. — Coxae, trochanters, femora and tibiae all clothed almost en- 

 tirely with ferruginous hair, except the anterior tibiae often mostly 

 dark on their front sides ; corbicular fringes entirely ferruginous. 

 Apices of hind metatarsi not drawn out into a very prominent pro- 

 jection behind the insertion of the second tarsal segment. 



Male. — Unknown to me. Friese described this sex as follows : "male 

 like worker, but with larger eyes; clypeus porrect. Length, 18-19 

 mm." 



Dimensions . — Length : queen, 26 mm. ; worker, 12 mm. to 15 mm. ; 

 male, 18 mm. to 19 mm. Spread of wings of worker, 28 mm. to 31 

 mm. 



The worker is here redescribed from four specimens — 

 three of them being the same three described by me in Ento- 

 mological News, XVIII. 



Habitat. — Peru (Marcapata and Callanga) and Ecuador. 



TRANS. AM. ENT. SOC. , XXXIX. (21) 



