Vou, IT, Part IT] WILLIAMS—BEES AND WASPS 349 
SAN MARTIN ISLAND (Off Lower California) 
APIDZ 
Four white banded bees, probably Anthophora sp., July, 
1905. 
REVILLAGIGEDO ARCHIPELAGO 
SAN BENEDICTO ISLAND 
LaARRIDZ 
1. Tachytes exornatus Fox 
One female taken July 26, 1905, on this rocky islet. 
It agrees perfectly with the unique female in the collection 
of the Academy of Natural Sciences of Philadelphia, and 
labeled: “type, L. Cal.” I did not go ashore on San Benedicto 
Island, but the wasp was said to be common there and doubt- 
less the young of a large short-horned grasshopper (Schisto- 
cerca ?) furnished the food supply for its young. 
SOCORRO ISLAND 
BEMBECIDZE 
A discolored Bembix sp. doubtfully referred to this island. 
July 26, 1905. 
COCOS ISLAND 
Family EUMENID& 
2. Odynerus (Pachodynerus) nasidens (Latr.) 
There are four females from Wafer Bay, Cocos Island, 
September, 1905. One of these specimens has been deposited 
in the U. S. National Museum. The propodeal crests show 
a slightly stronger outward bend at their inferior end than in 
most of the P. nasidens I have examined from elsewhere. 
