66 PROCEEDINGS OF THE ACADEMY OF [1899. 



hind tarsal joint covered with appressed, fiery-red, or coppery, 

 bristles, oblong, truncate, longer and wider than the hind tibi?8; 

 abdomen on first segment anteriorly, ventrally and at apex with 

 some pale hairs, otherwise uude; wings subhyaline, a dark streak 

 in the marginal cell originating at base, and a similar streak ex- 

 tending from the apex of the same cell in the form of an appen- 

 diculation. Length 12 mm. 



Florida: Biscayne Bay. Two specimens collected by Mrs. A. 

 T, Slosson, who, I believe, has other specimens of the species. C. 

 errans, whose origin is undoubtedly tropical, as the present speci- 

 mens should be considered wanderers from the West Indies, who 

 may or may not have taken up their abode in Florida, is most 

 closely related to C. apiealis and C. insularis from Saint Bartholo- 

 mew and St. Domingo respectively, Avith either of Avhich it may be 

 identical, but from the descriptions of these two species the present 

 one differs in several respects, which may, however, be due to 

 lack of greater detail. 



2. Centris pallida n. sp. 



9. — Black, densely clothed with grayish Avhite pubescence, that 

 on vertex and thorax above slightly pertaining to fulvous; median 

 and hind legs with black pubescence on tibiae and first tarsal joint; 

 remaining tarsal joints reddish; clypeus with a triangular yellow 

 mark; labrum covered with dense pile, that on base whitish, at 

 apex brownish; mandibles black, with pale pile at base externally; 

 first joint of flagellum slender, almost as long as the five following 

 joints; tegulte testaceous; fore tarsi fringed with pale fuscous hairs, 

 the pubescence of the inner side of first joint brownish; abdomen 

 with the pubescence of dorsal surface short, hoar-frost-like, except 

 on apical half of fifth segment where it is black; ventral segments 

 2-4 fringed at apex with long white hairs, the fringe of segment 

 5 being dark brown; the ventral segments medially are supplied 

 Avith darker dense pubescence, which, when viewed from the side, 

 extends from base of second segment to apex of fourth; sixth 

 segment with brownish pubescence, the pygidium elongate, narrow, 

 reddish at base, with a broad flat fold or swelling running from 

 apex to near base; wings subhyaline. Length 16-17 mm. 



Arizona: Phoenix. Five specimens given to me by Dr. H. G. 

 Griffith, by whom they were collected in May, 1898, on Ihe flowers 



