Vou. I, Parr IT] WILLIAMS—BEES AND WASPS 355 
The wasps of the family Crabronide are noticeable for 
their massive heads. They make burrows in the ground or in 
wood and store these, in most cases perhaps, with flies, though 
at least two species catch small moths, and one captures “book 
lice’ (Corrodentia). 
Family Larrip#& 
8. Nitela darwini Turner 
This unique specimen measures 3.5 mm. long and was taken 
on Charles Island, Galapagos, by Charles Darwin on the 
voyage of the “Beagle.” 
All the wasps of this genus are of small size and active and 
undoubtedly many species still remain to be described. Not 
much is known of their habits. They nest in dry wood and are 
sometimes found running on the trunks of trees. Homoptera 
seems to form the provisions for some; but Bridwell took a 
South African species storing her nest with wingless Psocidze 
(Corrodentia). 
Family LARRIDE 
9. Tachysphex galapagensis Rohwer 
This insect was described in Zoologica, Vol. V, No. 16, p. 
173-174, 1924, from six females and fifteen males, the lo- 
calities being Albemarle Island, March 21, 1899, and South 
Seymour Island, April 23, 1923. 
The wasps of this genus are exceedingly active insects and 
prey on orthoptera, chiefly on short-horned grasshoppers of 
which the young of the Galapagos Sphingonotus or Schisto- 
cerca, would be suitable. Most commonly they dig short, one- 
celled burrows and not infrequently provision several of these 
in a day, 
