60 PROCEEDINGS OF THE NATIONAL MUSEUM vol.83 



Female. — Front at extreme vertex 0.311 of the head width in the 

 one specimen; median stripe reddish yellow, narrowed uniformly 

 toward triangle, at base of antennae about as wide as one para- 

 frontal; sides of front thinly gray pollinose to vertex, blackish in 

 ground color; ocellar bristles absent; inner verticals moderately 

 large and reclinate, outer ones a little smaller, divergent; frontal 

 bristles about seven in a single row, descending hardly to the middle 

 of second antennal segment, three anterior ones directed inward, the 

 others reclinate, upper pair small, slightly behind these outside of the 

 row a second pair larger and divaricate; orbitals three pairs, pro- 

 clinate; face silvery pollinose, its lower border protuberant, the 

 ridges very flat, bare ; paraf acial with two stout bristles and a few 

 black hairs on lower part with only pale hairs above ; antennae red, 

 third segment strongly convex in front, slightly shorter than second 

 segment; arista dark brown, thickened on proximal two-thirds, 

 penultimate segment elongate ; cheek yellow in ground color, silvery 

 pollinose about one-third the eye height; palpi absent; proboscis 

 moderately long, apical segment tapering from base to tip; labella 

 small; beard grayish white. 



Thorax black, dusted with gray pollen; mesonotum marked with 

 four black stripes; pleura clothed with black hairs; scutellum red 

 on apex, gray pollinose. Chaetotaxy : Acrostichal, 3, 3 ; dorsocentral, 

 3, 3 ; humeral, 6 ; posthumeral, 2 ; presutural, 2 ; notopleural, 2 ; intra- 

 alar, 3; supraalar, 3; postalar, 2; pteropleural, 2; sternopleural, 2, 

 1; scutellum with 3 lateral (median one small), 1 decussate suberect 

 apical, besides two pairs of weak reclinate bristles on disk behind 

 the middle; postscutellum gray pollinose, membranous above; 

 calypters white. 



Abdomen black, subshining, with thin gray pollen, which is 

 changeable in different views, anal segment except on sides near base 

 red ; first segment without median marginal bristles ; second with one 

 rather short stout pair; third with one pair and three at the side; 

 fourth bearing a row of about eight discals besides a row of weaker 

 submarginals with still smaller bristles along the margin ; interme- 

 diate segments without discals. 



Legs yellow (hind pair missing), tarsi black; mid tibia with two 

 stout bristles on outer front side near middle; three intermediate 

 fore tarsal segments broad and flattened, the apical segment less than 

 one-half as large as preceding one ; claws and pulvilli short. 



Wings gray-hyaline ; fourth vein with an almost rectangular bend, 

 beyond slightly concave, thence straight to costa narrowing the first 

 posterior cell which is open far before the wing tip ; hind cross vein 

 oblique to fourth which it joins a little nearer bend than small cross 

 vein ; last section of fifth vein more than half the length of preceding 



