14 PROCEEDINGS OF THE NATIONAL MUSEUM vol.83 



bearing a few scattered inconspicuous hairs outside of frontal rows; 

 median stripe short, brownish black, narrower than one parafrontal 

 on entire length; verticals two pairs, outer ones about half as long 

 as inner, curving outward and backward; ocellars present, procli- 

 nate; frontals about five in the row, extending about to middle of 

 second antennal segment, uppermost pair larger and reclinate, the 

 pair next in front of these erect, decussate at tip, others directed 

 inward; one proclinate orbital bristle situated midway between the 

 anterior ocellus and base of antennae; face rather long and deep, 

 gray pollinose on reddish ground color, its ridges hardly divergent 

 downward, practically bare; vibrissae on the front edge of the 

 mouth ; paraf acials narrow, gray pollinose, bearing a row of bristles 

 which are reduced to small hairs on the upper half; antennae red- 

 dish yellow, as long as the face, third segment darker, about seven 

 times longer than second, which bears one long and numerous shorter 

 bristles on front side; arista about as long as third antennal seg- 

 ment, finely pubescent, thickened and yellow on proximal two-fifths, 

 black beyond, penultimate segment about twice as long as broad; 

 proboscis short, labella fleshy; palpi slender to tip, pale yellow, 

 bearing a few short black hairs near apex; cheek bare, gray polli- 

 nose on red ground color, about one-fourth the eye height; pos- 

 terior orbits broad to middle, thence narrowed upward, thickly cov- 

 ered with gray pollen; back of head sparsely pale haired, gray pol- 

 linose; eyes bare. 



Thorax black, gray pollinose; mesonotum marked with three 

 broad pale gray and two slightly narrower opaque black stripes, 

 which extend from the anterior margin to base of scutellum; the 

 latter black, dusted with changeable gray pollen, bearing two lat- 

 erals (with a large supernumerary bristle on one side), apical pair 

 strongly decussate; other details of chaetotaxy as in cornea; calyp- 

 ters transparent, white; postscutellum normal; no infrasquamal 

 hairs. 



Abdomen shining black; intermediate segments with silvery bands 

 on basal fourth to third, extending on venter to median line; first 

 and second segments each with a pair of median marginal bristles; 

 third with four marginals, none below the lateral pair; fourth with 

 a complete marginal row of about 12; no discals; genitalia small, 

 retracted; inner forceps blackish, short and united, moderately wide 

 at base, which is haired behind, tapering sharply to middle, slender 

 and shining beyond, tip acute; outer forceps largely yellow, convex 

 on outer side, tips acute and blackish, slightly longer than inner 

 ones; penis short, black, apex bordered with a narrow white mem- 

 brane; fifth sternite narrowly and deeply incised, the lobes shining 

 black, sparsely clothed behind with short, black hairs. 



