HYMENOPTERA. 6 



gins having a fuscous cloud, the tegulse testaceous. The basal 

 segment of the abdomen has a thin fringe of pale fulvous pubes- 

 cence, that on the other segments above and beneath is black ; 

 the abdomen is very black and shining, and delicately punctured. 

 Hab. ChiU. 



15. COLLETES OCCIDENTALIS. 



Colletes occidentalis, Halid. Linn. Trans. (1837) xvii. 322. 

 Hab. Chili. (Coll. W. Wilson Saunders, Esq.) 



16. Colletes cyanescens. 



Andrena cyanescens, Halid. Linn. Trans. (1837) xvai. 321. 

 Hab. Chili. (Coll. W. Wilson Saunders, Esq.) 



17. Colletes ursina, n. s. B.M. 



Female. Length 5 lines. — Black, entirely clothed with sooty 

 black pubescence ; on the face and cheeks it is silvery, as well as 

 on the tarsi beneath ; the latter has in certain lights a golden 

 tinge ; the wings subhyaline and beautifully iridescent, their ner- 

 vures black ; the legs very dark rufo-piceous, the claws ferrugi- 

 nous. 

 Hab. Columbia. 



18. Colletes mandibularis, n, s. B.M. 



Male. Length 3 lines. — Black ; the face, thorax and legs 

 clothed with bright lemon-yellow-coloured pubescence ; the an- 

 tennae beneath, except the two basal segments, fulvous ; the 

 mandibles bright ferruginous ; the wings hyaline, iridescent, and 

 having their tegulse and nervures ferruginous ; all the tarsi 

 and the calcariae pale ferruginous ; the basal segment of the ab- 

 domen fringed with long pubescence, and all the apical margins 

 of the segments banded with pubescence of a lemon-yellow 

 colour. 



Hab. Georgia. 



19. Colletes THORACicA, n. s. B.M. 



Female. Length 6 lines. — Black, the clypeus coarsely punc- 

 tm-ed, the face thinly clothed with pale pubescence, that on the 

 disk more dense and fulvous ; the thorax above clothed with 

 bright fulvous pubescence, beneath it is nearly white; on the 

 posterior femora and tibiae beneath, the pubescence is of changing 

 golden yellow, the floccus palest, on the legs above it is fus- 

 cous ; the claws ferruginous ; the tegulse ferruginous, as well as 

 the neuration of the wings, the wings being hyaline, and having 



