158 '^he Philippine Journal of Science lan 



the vertex; ocelli placed near the base of this plate, but a little 

 removed from the vertical keel; in the female the frons is dis- 

 tinctly narrower than in the male and entirely occupied by the 

 shining black plate. Face pale yellowish, white-shining, much 

 narrower than the frons, strongly raised toward the middle, in 

 the shape of a longitudinal keel, entirely bare; jowls rather 

 prominent, colored like the face ; mouth opening triangular ; chin 

 short, with whitish hairs. Proboscis thin, much longer than 

 body when exserted, black, with narrowly yellow base and 

 broadly yellow end of lips; no distinct palpi; antennse porrect, 

 first joint very short, whitish, bare; second joint reddish yellow, 

 longer than the first, produced in a lobe on inner side of the 

 third, with short black hairs ; third joint reddish yellow, darkened 

 along the upper border, about as long as the first two joints 

 together, broad, obtuse at end with a rather thick, subapical, 

 bare black arista, the two basal joints of which are small but 

 distinct. Of cephalic bristles there is only one pair of strong, 

 long, black, parallel or slightly converging, inner verticals; the 

 sides of frons near the base have two or three short, bristly 

 black hairs directed forward ; the rest of the frons is quite bare 

 like the ocellar plate. 



Mesonotum subquadrate, as long as broad, strongly convex, 

 dark yellowish, red, or black, with two approximate, longitudinal 

 brown stripes which are prolonged behind a little over the 

 middle and with two broader but less distinct stripes on sides 

 not prolonged over the suture in front; pleurae and breast pale 

 yellowish, almost whitish ; humeral calli rounded, very prominent, 

 pale yellowish. Dorsum clothed with short and scanty black 

 hairs; bristles black, long, and strong; three posterior noto- 

 pleurals, approximate ; three to five supra-alars ; one dorsocentral 

 near the scutellum; one very long and strong pteropleural. 

 Scutellum small, convex, rounded, reddish brown above, yellowish 

 on sides and below, with one apical pair of long, diverging 

 black bristles. Postscutellum convex, prominent, dark brownish 

 in the middle; mesophragma narrow, yellowish. Squamae yel- 

 lowish, with black border; halteres yellowish. Abdomen elon- 

 gate, with parallel sides, a little narrower than, and about three 

 times as long as, the thorax; entirely reddish yellow, rather 

 shining, the hind borders of segments two to five with a blackish 

 transverse band above, which is not prolonged to the sides. 

 Second segment on sides with five or six long, bristly black 

 hairs, the rest with short black hairs ; venter pale yellow. Male 

 genitalia subglobose, yellow, with two brown spots above near 

 the base, shining yellow below and with some short black ap- 



