318 
The Philippine Journal of Science 
1921 
with a median carina ; postpetiole not nodose ; petiole cylindrical, 
as long as the posterior leg to apex of femur ; abdomen smooth, 
shining; pygidial area obsolete; first recurrent received near 
apex of first cubital cell; second cubital cell narrowed above; 
second recurrent received in the third cubital cell at a little 
greater distance from the second transverse cubitus than the first 
recurrent is from the first transverse cubitus; venation of hind 
wings, typical. Black; mandibles except apices, first three seg- 
ments of flagellum, tegulse, tubercles yellow; legs and abdomen 
reddish ; flagellum piceous, yellowish beneath ; face, clypeus, and 
thorax (more sparsely) clothed with silvery pubescence. Wings 
hyaline, iridescent; venation brown. 
Type locality. — Los Banos, Laguna, Luzon. Described from 
two females (one type) forwarded by C. F. Baker. A para- 
type from Lamao, Bataan, Luzon, also from C. V. Piper. 
Type. — Catalogue No. 22844, United States National Museum. 
In the position of the first recurrent this species is not typical 
of the genus Diodontus. 
Diodontus basilanensis sp. nov. 
Allied to Diodontus philippinensis , but can be readily sepa- 
rated by the characters given in the preceding key. 
Female. — Length, 8 millimeters. Clypeus convex, the apical 
margin with a depressed area medially which is nearly truncate ; 
frontal carina strong, terminating ventrally in a transverse 
ridge; seen from in front this ridge is slightly produced, and 
then emarginate, medially; antennae long, slender, but slightly 
thicker apically, the third joint about one-fifth longer than the 
fourth; frons flat; no depression around the ocelli; postocellar 
line only a little longer than ocellocular line; anterior dorsal 
margin of pronotum with a distinct carina, not dentate laterally ; 
scutum shining, with only setigerous punctures, parapsidal fur- 
rows present on anterior half ; scutellum shining, almost without 
sculpture ; metanotum with dense hair ; base of propodeum with 
a depressed area which is crossed by about twelve rugae ; rest of 
propodeum, except polished areas at the sides basally, reticulate- 
coriaceous, the reticulations more pronounced posteriorly; 
mesepisternum smooth, with setigerous punctures, the sulci not 
foveolate ; four anterior femora rather robust ; longer calcarium 
of hind tibia subequal in length to the hind ba^itarsus; petiole 
cylindrical, strongly curved, its length about equal to that of 
the hind femur; first recurrent slightly before the first inter- 
cubitus; second recurrent joining the third cubital at a distance 
