40 PROCEEDINGS OF THE NATIONAL MUSEUM vol.79 



from middle to base of antennae ; paraf lontals gray pollinose to ver- 

 tex, moderately haired and bearing a few bristles outside of the 

 frontal rows below; verticals two pairs; ocellars present; orbitals 

 none; frontal bristles extending opposite to apex of second antennal 

 joint the uppermost erect or slightly reclinate (weak or hairlike in 

 one specimen) and situated before triangle; antennae about three- 

 fourths as long as face, black, third joint more or less tinged with red, 

 slender, second joint almost two-thirds the length of the third ; arista 

 about as long as antennae, reddish, hardly thickened basally, with a 

 short penultimate joint; face gray pollinose, the sides narrowed 

 downward, bearing slender black hairs on the inner margins ; vibris- 

 sae on level with front border of mouth ; palpi reddish yellow, slender 

 to tips, beset with black hairs; cheeks red in ground color, covered 

 with gra}^ pollen and dense black hairs, in profile about one-eighth 

 the eye height; occiput densely gray pollinose, with a thick ruff of 

 whitish hairs. 



Thorax black, densel}' gray pollinose, marked with five black dorsal 

 stripes, the median one narrower and obliterated in front of suture; 

 scutellum red except the narrow basal margin, dusted with thin 

 grayish-white pollen; calypters oj^aque, white the margins broadly 

 yellow. 



Abdomen red on sides and apex with a broad black median stripe 

 widening in front and including most of the basal segment; inter- 

 mediate segments covered with changeable pale-grayish pollen, which 

 in some views extends to the hind margin of each; basal half or more 

 of the fourth segment covered with thicker pollen, which is inter- 

 rupted by a dark median stripe continuing on segments 3 and 2; 

 hairs except on anal segment depressed ; no median marginal bristles 

 on segments 1 and 2 ; third bearing a marginal row of 10 to 12, large ; 

 fourth with a subdiscal and an apical row of smaller bristles ; venter 

 with defined patches of dense hairs on third and fourth tergites, 

 small on latter; inner genital forceps of ordinary width, sharply 

 keeled behind, tapering beyond middle to the slightly incised apex; 

 outer forceps shorter than usual, about one-half the length of inner 

 ones, triangular, yellow. 



Legs moderatel}^ stout, black tinged with red; front claws and 

 pulvilli about equal the length of last two tarsal joints; mid tibiae 

 with one large bristle on outer front side near middle; hind tibiae 

 thickly and evenly ciliate. 



Wings grayish hyaline ; veins reddish yellow ; venation normal ; no 

 costal spine ; third vein with one setule at base. 



Length, 9.5 to 10.5 mm. 



Female. — Unknown. 



