﻿38 Bulletin American Museum of Natural History [Vol. LVII 



yellow, the small third segment black; first segment black-haired above and, inwardly 

 below with yellow hair, the second segment with black hair. There is a small blackish 

 triangle between and above the base of the antennae. 



Mesonotum opaque black, with the humeri, notopleura and posterior calli, 

 bright yellow, the space between the notopleura and posterior calli, rusty reddish. 

 Thorax with long ])lack hair except across the front margin and along the sides, the 

 disc with golden tomentum; posterior calli Ijlack-haired, the sides of the mesonotum 

 with tawny pile; pleura gray pollinose and yellow pilose. Hypopleura yellow except 

 on the posterior lower half. Scutellum rusty yellow, sparsely clothed with stiff back 

 han-s. 



Legs rusty yellow, the tarsi ferruginous. Wings somewhat cinereous and rather 

 strongly tinged with luteous; squamse yellow, the pile whitish; haltères yellow. 



Abdomen orange-red. First segment dull black with linear yellow apex, the 

 second with a slightly tapering median black vitta which is suddenly expanded on the 

 apical fourth of the segment to three times its basal width and from the posterior end a 

 slender black line runs to the lateral margin. Third segment with a verj' small oval 

 black spot, the fourth wholly pale; fifth black with a l)road, pale posterior margin, 

 the sixth and seventh each l^roadly black l)asally in the middle. Pile yellow on the 

 first segment, basal half of the second, lateral margin of the second and third and the 

 whole of the venter, elsewhere black; long on the first segment, the sides and venter, 

 tomentose on the base of the second. Both lolies of the posterior forceps bear abundant 

 stout short black spines. 



A single male, Stanleyville, March, 1915. 



Petrorossia Bezzi 

 This genus is but feebly differentiated from Aphœhantus Loew and 

 should, perhaps, rank only as a subgenus. I present here a description 

 of the female of P. fulvipes Loew in addition to that of a new species. 



Petrorossia fulvipes (Loew) 



Anthrax fulvipes Loew, 1S60, Ofvers. Kongl. Vet. Akad. Forhandl., XVII, p. 89. 



Length, 6 to 7 mm. 



Female. — Head black, thickly covered with silvery white pollen on the face, sides 

 of front below and occiput, the i)ollen on the occiput gradually becoming brown above, 

 the front shining l>lack except on the sides of the lower half; very narrow orbital 

 border pale yellow. Face and occiput yellow pilose, the front with black pile. Anten- 

 na:' each inserted in an orange-yellow circle, black, with only the tip of the first seg- 

 ment reddish; third segment short, the basal portion broader than long, the, whole 

 segment but little longer than the first two combined, its tip reddish. 



Thorax black, the mesonotum brownish pollinose, the sides and pleura with pale 

 grayish pollen; hairs of the mesonotum black, with the golden tomentum quite abun- 

 dant; a few fine, black bristles posteriorly, the lateral bristles yellow. Sides of the 

 mesonotum, the propleura and upper half of the mesopleura with long, golden yellow 

 pile, the pleura whitish haired ])elow. Scutellum blackish, the basal third and narrow 

 margin clothed with golden tomentum, the remainder with short, sparse appressed 

 black hairs, the margin with three or four pairs of short bristles. 



