18, 3 Rohwer: New Philippine Wasps 313 
Female.—Length, 9 millimeters. Clypeus flat, closely, finely 
punctured, the apical margin with two triangular median teeth; 
face sculptured like the clypeus, without a transverse carina; 
frontal carina complete from anterior ocellus, very prominent 
between the antennz; frons, vertex, and posterior orbits shining ; 
on the frons near the top of the eye margin is an elongate 
tubercle, the dorsal margin of which is tangent to a line 
touching the lower margin of anterior ocellus; postocellar 
line one-fourth shorter than the ocellocular line; scape nearly 
straight; flagellum thickening apically, the third joint distinctly 
longer than the second; anterior margin of the pronotum feebly 
carinate, the lateral angles rounded; mesoscutum with sparse, 
rather large punctures; parapsidal furrows weak, about one- 
third the length of the scutum; scutellum and metanotum 
impunctate; mesopleura and sides of propodeum anteriorly 
shining, impunctate; inclosed area of propodeum broadly 
triangular, with strong longitudinal carine, defined posteriorly 
by a smooth area; posterior surface and sides of propodeum 
posteriorly finely transversely striate-reticulate, the posterior 
surface with a median sulcus; abdomen smooth, shining; 
postpetiole rather sharply defined anteriorly; petiole cylindrical, 
curved, as long as posterior leg to apical third of femur; 
pygidial area not defined; venation typical except that the first 
recurrent is interstitial with the first intercubitus; second 
cubital cell trapezoidal in outline; third intercubitus sharply 
angulate above the middle. Head black; mandibles, except 
apices, yellow; scape and pedicellum yellow, flagellum piceous, 
ferruginous beneath; thorax yellow; pronotum anteriorly, three 
spots on the scutum (the median one the largest), mesosternum 
medially, spot on mesepisternum, posterior margin of mesepi- 
sternum, mesepimeron, metapleura, inclosed area and median 
sulcus of propodeum black; legs yellow, posterior trochanters, 
bases of posterior femora and posterior tarsi piceous; abdomen 
reddish. Wings hyaline, iridescent; venation dark brown. 
Face, clypeus, and thorax with sparse golden pubescence. 
Type locality—Mount Maquiling, Laguna, Luzon. Described 
from one female from Mount Maquiling (type) and one female 
from Los Bafios, Luzon. Collected by C. F. Baker, for whom 
the species is named. 
Type.—Catalogue No. 22839, United States National Museum. 
Diodontus luzonensis sp. nov. 
This species closely resembles Diodontus bakeri but may be 
easily differentiated from that species by the impunctate scutum 
