312 The Philippine Journal of Science 1921 
Except where mentioned the male agrees with the female. 
Type locality. — Los Banos, Laguna, Luzon. Described from 
one female type and one male allotype from Los Banos and from 
a female paratype from Mount Maquiling. All received from 
C. F. Baker. 
Type. — Catalogue No. 22838, United States National Museum. 
A single male from Puerto Princesa, Palawan, received 
from C. F. Baker after the above was written, differs from 
the allotype in lacking some of the yellow markings. It is 
labeled as variety A and is not considered as part of the type 
material. The color of this specimen is as follows: Black; 
mandibles, except apices, scape, dorsal margin of pronotum, 
tubercles, tegulse, a spot above and one below, scutellum, meta- 
notum, two small, elongate spots on posterior surface of 
propodeum yellow ; flagellum piceous, yellow below ; legs 
yellow, bases of four anterior femora brownish, hind legs 
below trochanters brownish ; abdomen reddish, petiole and 
postpetiole black; wings hyaline, venation pale brown. 
B. Parapsidal furrows wanting, or at most only present anteriorly. 
1. Second and third cubital cells each receiving a recurrent, or the first 
recurrent interstitial with the first intercubitus. 
a. Abdomen and most of body blaxk. 
Diodontus xanthognathus (Rohwer) . 
Males and females of this species were taken at Los Banos 
and on Mount Maquiling, Luzon, and at Puerto Princesa, 
Palawan ; a male was taken at Dapitan, Mindanao. All received 
from C. F. Baker. 
Female. — Length, 6 millimeters. Facial carina almost obso- 
lete; median teeth of clypeus more distinct than in male; 
antennae subclavate, the third joint slightly longer than the 
fourth ; posterior surface of propodeum smooth shining, median 
sulcus poorly defined ; pygidial area not defined ; posterior 
tarsi piceous; second tergite with two reddish spots which 
vary in size. Otherwise agrees well with male. 
There is some variation in the color of the four anterior 
femora, as in two males they are piceous to near the apex. 
b. Abdomen reddish, thorax yellow marked with black. 
Diodontus bakeri sp. nov. 
This species may be separated from Psenulus interstitialis 
Cameron by the triangular, not transverse, inclosed area on 
the propodeum, and by the different clypeus. 
