1912] Cockerell — New Bees from Brazil 43 



short, yellow in front; flagellum reddish-black, apical half of the long first joint 

 red beneath; clypeus (except a very broad black bar on each side), a transversely 

 crescentic supraclypeal mark, lateral marks (pointed above on orbital margin), the 

 short malar space, labrum and more than basal two-thirds of mandibles all lemon- 

 yellow; tegulse ferruginous, dark at base; wings reddish-smoky, nervures fuscous; 

 legs black, with the tarsi, hind femora apically, and hind tibiae for the greater part 

 (the basal half behind) ferruginous; spurs ferruginous; spot at base of anterior 

 and middle tibiae, and long stripe on anterior tibiae, yellow; hair of legs mostly pale, 

 black on hind tibite except a large tuft posteriorly on apical half, on hind basitarsi 

 reddish-black without and dark red within, but pale and strongly plumose poste- 

 riorly; hair on inner side of anterior and middle tarsi red; abdomen short and broad, 

 dark metallic green, with the apical margin and sides of fourth segment, and the 

 whole of fifth to seventh, clear red, a reddish suffusion also at sides of second and 

 third apically; second and third segments each with large lateral yellow patches, 

 that on the second much the largest, subquadrate; first abdominal segment, except 

 at apex, and fourth and following segments, with pale hair; apex of first, and sec- 

 ond and third, with thin short black hair, only visible in lateral view; venter with 

 abundant pale reddish hair. 



Hab. — Rio Madeira, Brazil; Madeira-Mamore R. R. Co. Camp 

 43 (Mann & Baker). This is 325 km. from Porto Velho. C. bakeri 

 is a species of the C. versicolor group, recognizable by the yellow 

 patches on the sides of the abdomen. C. haemorrhoidalis (Fb.) 

 has a yellow spot on each side of the second abdominal segment, 

 but the abdomen is quite a different color, and the thorax is dark- 

 haired. 



The three species of Hemisia in the collection are separable thus: 



Wings bicolored, very dark, with broadly pallid apical field; hair of ver- 

 tex ( 9 ) black maculata Lep. 



Wings not bicolored 1 



1. Abdomen yellowish-green, the hind margins of the segments pallid, 

 but the apex not red; cream-colored spots at sides of segments 2-5, 

 that on 2 a mere dot aenea Lep. 



Abdomen dark green, red apically; yellow patches on sides of second 



segment very large bakeri Ckll. 



Centris (Pfilofoptis) heterodonta sp. nov. 



Female. Very robust; length about 19 mm., anterior wing about 12; black, 

 the legs and the end of the abdomen red; hair of head and thorax fulvous, without 

 black or fuscous, paler beneath, becoming dull white on lower part of cheeks; scape 

 thick, yellow in front; flagellum dark, ferruginous at extreme apex; clj^jeus convex 

 with a large median cup-shaped black area, on which is a longitudinal yellow band, 

 this band smooth and shining, but the black space on each side of it dull, with 



