THE PHILIPPINE WASPS OF THE SUBFAMILY 
SPHECINSE 
By S. A. Rohwer 
Honorary Custodian of Hymenoptera, United States National Museum 
The wasps belonging to the subfamily Sphecinse are often 
called “thread-waisted,” because of the petiolated abdomen. 
The habits and prey of the group vary considerably. The 
Chlorionini nest in the ground and provision their nests with 
Orthoptera. The Sphecini also nest in the ground but use lepi- 
dopterous larvse as food for their young. The Sceliphronini 
are usually called “mud-daubers,” because of their habit of con- 
structing mud nests which are provisioned with spiders. 
The group is easily recognized by the three complete cubital 
cells ; petiolate abdomen ; long propodeum, in which the spiracles 
are well removed from the base ; the presence of two calcaria on 
intermediate tibiae; rather large size; etc. 
Key to tke Philippine tribes of the subfamily Sphecinse. 
1. Second and third cubital cells each receiving a recurrent vein; pro- 
podeum without a U-shaped area on its dorsal surface; robust species 
with a short petiole Chlorionini. 
Second cubital cell receiving both recurrent veins; slender forms with a 
long petiole 2. 
2. Propodeum without a U-shaped area on its dorsal surface; female with 
a tarsal comb Sphecini. 
Propodeum with a U-shaped area on its dprsal surface; tarsal claws 
with an inner tooth; female without a tarsal comb Sceliphronini. 
Tribe CHLORIONINI 
Genus CHLOBION Latreille 
The species of this genus were monographed by Kohl in 1890 
under the generic name Sphex and they are still often assigned 
to that genus, which is however properly applied to species as- 
signed to Ammophila. 
Key to Philippine species of the genus Chlomon. 
1. Tarsal claws with one inner tooth 2. 
Tarsal claws with two inner teeth 3. 
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