62 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 63 



Male (type). — Head with front at narrowest part 0.23 head width; 

 frontal row of nine bristles, extending from on a level with middle of 

 second antennal segment to two strong reclinate upper frontals (pre- 

 verticals) ; facial ridge bristly on lowest one-sixth; gena less than one- 

 fifteenth eye height; frontal orbit, face, cheek, and posterior orbit 

 silvery-gray pollinose; antenna black, third segment five times as 

 long as second ; palpus yellow. 



Thorax shining black covered with gray pollen; five black mesono- 

 tal vittae, median one obsolete before suture, inner pair well defined, 

 outer pair interrupted at suture; four postsutural dorsocentral 

 macrochaetae : scutellum black, faintly yellow, on apical half covered 

 with gray pollen, three pairs of marginal scutellars and one strong 

 decussate apical pair directed backward, disk covered with erect hairs 

 and bearing one pair of discal scutellars; two sternopleural macro- 

 chaetae; legs wholly black; fore tibia with one median posterolateral 

 bristle; middle tibia with one median long stout anterolateral bristle, 

 one long inner ventral bristle; hind tibia ciliate, with one longer 

 bristle near middle; wing grayish hyaline, third vein with two to 

 three bristles at base, squamae white. 



Abdomen black, wholly covered with gray pollen except dorsum 

 of first segment, which is shining black, usual black dorsal vitta obso- 

 lete except on basal half of second segment; first and second segments 

 with a marginal pair, third and fourth with a marginal row of 

 macrochaetae; no discals. 



Hypopygium rufous; inner forcep in profile long and tapering, 

 outer side strongly and evenly curved from tip to base, inner side if 

 divided into sevenths tapering abruptly on sixth portion to form a 

 tooth out of seventh; outer forceps two-thirds length of inner, 

 strongly appressed against inner side of inner forceps, in profile 

 sides of outer forceps parallel, ending bluntly, apical one-third 

 thickly beset with numerous small spines (viewed under binocular 

 high power). 



Length 10 mm. 



Female (allotype). — Front at its narrowest part 0.24 head width; 

 frontal row of six bristles, extending upward from on a level with 

 base of third antennal segment; two pairs of fronto-orbital bristles; 

 third segment of antenna slightly less than four times second; arista 

 thickened on basal one-fourth; penultimate segment short. Pulvilli 

 one-half length of those of male; base of third vein with one or two 

 bristles. Fourth segment of abdomen lacking macrochaetae, covered 

 with erect bristles about one-half size of macrochaetae on third seg- 

 ment. Except for hypopygium, remainder of description same as 

 for male. 



Length 10 mm. 



