354 CALIFORNIA ACADEMY OF SCIENCES __ [Proc. 47H Ser. 
Male. Allotype. Total length 10 mm. Much like the fe- 
male. Clypeus margined with yellow except at base, the yel- 
low being much narrowed at apex, the color extending well 
into the emargination of the eyes; scape of antennz yellow 
beneath, flagellum brownish beneath. Abdomen with yellow 
bands on two to seven, that of seven subapical. Clypeus nearly 
truncate, the emargination being very shallow. Genital arma- 
ture very like that of P. simplicicornis Sauss. from Hawaii. 
There is a low thorn on the mesopleura. This male unfortu- 
nately was subsequently almost wholly destroyed in transit 
through the mails. 
Type: Female, No. 1871, Mus. Calif. Acad. Sci., collected 
in January, 1906, by F. X. Williams at Wreck Bay, Chatham 
Island. 
This insect is closely allied to Pachodynerus gauller Bréthes, 
from Venezuela which also has the propodeal crests well de- 
veloped though hardly as strongly as in galapagensis. 
Pachodynerus is a subgenus of Odynerus and was erected 
by Saussure for a group of stout-bodied wasps, the males of 
which have the antennze ending simply, i. e., not terminating 
in a hook. The subgenus is peculiar to temperate and tropical 
America. 
The Odyneri usually prey upon caterpillars which they store 
in burrows in the ground, in wood, in mud cells or in cells 
of other material. The egg is suspended from the roof or 
side of the cell by a fine thread. 
Family CRABRONIDE 
The adult of this fly-catching wasp was not seen, but its 
easily recognized cocoons containing larvze were found at low 
altitude in cells in a decayed branch of an Erythrina tree, 
August, 1906, at James Bay, James Island. The cocoons were 
of the typical crabronid form such as occur in the Hawaiian 
Islands, and the single Galapagos cocoon preserved shows the 
remains of muscoid flies fastened at its smaller or basal end. 
