56 



Syrphus arcuatus Fall. October 7. 



The brightly colored syrphid-flies feed in the adult stage upon 

 pollen. The larval food habits vary greatly, but the larva of this 

 species probably lives upon plant-stems, feeding upon plant-lice. The 

 specimens in the Havana series were taken on flowers of aster, along 

 a roadside. They are not restricted to sand regions. 



SpaJanzania sp. (undetermined). October 6. 



A gray tachinid taken on flowers of Knlinia, with pentatomids. 

 The tachinids are almost all parasitic, particularly upon caterpillars. 



Gonia frontosa Say. April 8. 



This tachinid was found at the bottom of a hollow between 

 bunch-grass dunes. It had evidently just emerged from the pupa, 

 for the wings and other parts had not hardened. The genus is para- 

 sitic upon cutworms, and probably other caterpillars. 



Phorhia fitsciccps Zett. April 4. 



One specimen, from under a log, with a large number of other 

 insects, in bunch-grass of advanced stage. Of the family Antho- 

 myiidac, the larv?e of which include scavengers, parasites, leaf- 

 miners, and root-maggots. This species is a general feeder in roots 

 of common crops, according to Smith. In the natural state it prob- 

 ably feeds on grass-roots. 



Scatophaga sp. (undetermined). April i, 8. 



Common at the Devil's Hole, flying about in the bunch-grass. 

 The larvcC of the Scatophagidac are of various habits, a number oc- 

 currins: in stems of Riimex. 



't5 



Order hymhnoptera 



Urios I'csfali Girault, type unique. April i. 



A nearly wingless female, taken in the nest of the sand ant Phei- 

 dole z'inclandica Forel, which it closely resembles. The nest was in 

 the bunch-grass of the Devil's Hole. Family Pteromalidac. (For 

 description see Girault '11.) 



Apantclcs tJiccIac Riley; Girault, det. April i. 



Two bunches of cocoons were found; one under a board in a 

 sandy lane, the other in a rosette of mullein. The adult parasites 

 began hatching out April 17. Bunches of empty hymenopterous co- 

 coons, probably of several different species, were seen in bunch-grass 

 in 1910. 



