34 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 66: 



few small hairs above them. Antennae small, yellow, separated by a 

 well-developed carina which extends between them at base, althougli 

 low and narrow here: third joint slender, twice the second, not nearly 

 leaching the vibrissae: arista short with dense erect plumosity. 

 Palpi smallish, yellow; proboscis small, the labella yellow. Biicca 

 one-half the eye height. 



Thorax with dense yellow pollen becoming more gray on pleurae,, 

 with four narrow incomplete darker stripes. Chaetotaxy : acrostichal 

 1, 1 (sometimes a second small pair before the prescutellars) ; dorso- 

 central 4, 3 ; humeral 2 ; posthumeral 1 ; presutural 1 ; notopleural 2 ; 

 supraalar 2 ; intraalar 2 ; postalar 2 ; scutellum with 2 lateral, a large 

 decussate apical pair and a small discal ; sternopleural 2 ; pteropleural 

 minute. 



Abdomen mostly yellow in ground color, a variable interrupted 

 median black stripe, and narrow variable black hind margins on last 

 three segments; the inflexed ends of the second and third tergites 

 come together below and are more or less tipped with black, thus 

 forming a variable black median ventral stripe. First segment with- 

 out median marginals; second with one pair discal and one marginal, 

 other marginals toward the sides; third segment with one or two 

 pairs of discals, and a stout marginal row of 8 ; fourth segment with 

 irregular discal and apical rows. Genitalia small, yellow, the lobes 

 of the fifth sternite black. The pollen of the abdomen is yellowish 

 and confined to the bases of the last three segments, covering half of 

 the fourth. 



Legs 3"ellow, tarsi however black : claws and pulvilli long. Middle 

 tibia with only one small bristle on outer front side ; hind tibia with 

 two small on outer hind side. 



Wings somewhat brownish; costal spine distinct; fourth A'ein 

 sharply bent at a right angle, with a slight or distinct stump at the 

 bend, ending not very far before the apex; third vein with only 2 to 

 5 small hairs at base. 



Female. — Looks like a distinct species, but was reared with these 

 males. The abdomen is but little or hardly at all yellow in ground 

 color, the basal pollinose bands contrasting with the shining black 

 apical half on segments 2 to 4. The wing is broader, and the fourth 

 vein curves more distinctly backward beyond the crossvein. Width 

 of front at narrowest (vertex) is 0.38 in one specimen and 0.45 in the 

 other. There are only 5 to 6 f rontals, the upper one turned back and 

 outward ; the usual two orbitals are large and proclinate. The usual 

 tAvo pairs of verticals are present. 



Length of male, 8.6 to 10.3 mm. ; of female. 7.6 and 8.4 mm. 



Described from seven males and two females, reared from scara- 

 baeid beetles at Suigen, Korea, by C. P. Clausen and J. L. King. 



r.v;?^.— Male, Cat. No. 27245, ij.S.N.M. 



