820 The Philippine Journal of Science 1921 
yellow; abdomen ferruginous, except petiole and spots on the 
third and fourth tergites and sternites which are piceous. 
Wings hyaline, iridescent; venation pale brown. Face, clypeus, 
frons, and thorax (sparsely) with yellowish pubescence. 
Type locality—Luzon. Described from two females from 
C. F. Baker. The type from Mount Maquiling, the paratype 
from Mount Limay. 
Type.—Catalogue No. 22849, United States National Museum. 
The venation of the anterior wings is not typical of this 
genus. 
Diodontus ajax sp. nov. 
The large size and transverse ridge across the face will readily 
distinguish this species from, its allies. 
Female.—ength, 12 millimeters. Labrum broadly arcuately 
emarginate apically and with a fringe of hair; clypeus convex, 
with separate, distinct punctures, the apical margin with two 
small teeth; frontal carina prominent and sharp, terminating 
ventrally in a transverse ridge which does not quite reach the 
eye margin; frons and vertex shining, with small sparse punc- 
tures; no tubercles on frons; ocelli in a low triangle; the post- 
ocellar line subequal with the ocellocular line; flagellum only 
slightly thickened apically, the first joint somewhat longer than 
the second; pronotum sharply carinate anteriorly but not 
toothed; scutum shining, with small, well-separated punctures, 
parapsidal furrows present anteriorly ; scutum in front of scutel- 
lum strongly foveolate; scutellum and metanotum smooth, 
impunctate; mesopleura smooth, polished, the posterior aspect 
finely aciculate, dorsal aspect with a transverse area which has 
twelve longitudinal carinze; median sulcus of posterior surface 
strong and of uniform width; legs rather hairy; longer spur of 
hind tibia as long as the basitarsus, strongly angled basad of 
middle; petiole cylindrical, without carinz, nearly as long as 
hind trochanter and femur; abdomen polished; first recurrent 
before the first intercubitus by a distance as great as the second 
abscissa of radius, the second recurrent the same distance beyond 
the second intercubitus; third intercubitus forming a right 
angle with the cubitus for a short distance only, then strong- 
curving inward to the radius so that the third cubital is 
one-fourth longer on the cubitus. Head black; a yellow spot 
on mandibles; antenne black, scape, pedicellum, and most of 
flagellum beneath yellowish; thorax black with the following 
yellow marks: Top of pronotum, tegulz, scutum except a large 
median and a small lateral spot, scutellum, metanotum, two large 
