Part i 
Descriptions of Philippine 
Wasps 
By S.A. ROHWER 
Forest Insects, Bureau of Entomology, Washington, D. C. 
Descriptions of these new species are offered at this time so the 
names may be used in an article by F. X. Williams, dealing with 
the habits of Philippine wasps. The descriptions were based 
largely on material collected by Dr. Williams, but occasionally 
specimens which had been accumulated by Professor C. F. Baker 
have been examined and made part of the type series. The types 
of these species are in the National Museum. 
SUPERFAMILY SPHECOIDEA. 
FAMILY SPHECIDAE. 
Subfamily Pemphredoninae. 
Polemistus luzonensis, new species. 
Female—Length, 5 mm. Anterior margin of the clypeus 
strongly triangularly produced, the surface smooth, shining ; inner 
orbital carina complete to level of anterior ocellus, the area be- 
tween it and the eyes foveolate; frontal carina curved and joining 
inner orbital carina opposite the top of scape (when extended 
dorsally) ; a strong median carina from anterior ocellus to front 
carina and also to lateral ones which diverge from the ocellus 
and set off a wedge-shaped area; frons and vertex shining with 
small, poorly defined punctures ; ocelli in a low triangle, the posto- 
cellar line distinctly greater than ocellocular line; eyes slightly 
converging below, the distance between them at the clypeus sub- 
equal with the length of the scape; posterior orbital carina strong; 
complete above middle of eye and with a branch on the vertex 
extending as far as the lateral ocelli; area between posterior 
orbital carina and eye foveolate; occipital carina strong, some- 
