71 
An adult was bred October 24, 1887, by A. Koebele, from a gall-like 
swelling on the stem of Elymus arenarius collected a few days previ- 
ously near Alameda, Cal. 
Chlorops ingrata Will.—On August 12, 1884, several plants of Muhlen- 
bergia mexicana were received from F. M. Webster, Oxford, Ind. At 
the tips of the plants were gall-like swellings, each containing a larva or 
puparium of this insect. The adult flies issued May 12, 15, and 21, 
and June 1, of the following year. 
Chlorops graminea Cog.—An adult of this species was bred by A. 
Koebele, June 12, 1888, from a gall-like swelling on an unknown grass 
collected in April of that year at Lancaster, Cal. 
Chlorops assimilis Macq.—On July 26, 1884, Mr. Theo. Pergande found 
two larve and one puparium of this insect among a colony of aphides 
on the roots of Poa pratensis. One of the flies issued on the 51st of the 
same month. 
On September 6, 1892, several sugar beets were received from the 
W. B. Sugar Company, of Castroville, Cal., and in the leaves were 
found a number of the puparia of this insect. The adult flies issued 
two days later. 
Larve and puparia of this species were taken September 1, 1897, by 
Messrs. F. H. Chittenden and F. C. Pratt in the earth about the roots 
of horse-radish in the vicinity of Tennallytown, D.C. Several adults 
issued a few days later. The larvee and puparia were evidently attacked 
by one or more species of minute Staphylinidz found with them in all 
stages, and some of the puparia gave forth the proctotrypid parasite 
Loxotropa californica Ashm. 
Genus GAURAX Loew. 
The two preceding genera belong to the group Chloropine, while the 
present genus and the genera which follow belong to the Oscinine. 
The larve of the genus Gaurax differ in a marked degree in habits 
from the others in that they feed upon insect remains instead of vege- 
table matter. 
Gaurax anchora Loew.—A cluster of egg shells of Corydalus cornutus 
found Auwgust 24, 1895, by Mr. E. A. Schwarz, near Washington, D.C., 
was placed in a glass vial containing damp sand, and on the 5d of the 
following month a puparium of this Gaurax was found in the sand; the 
adult fly issued on the 12th of the same month. 
Four adults issued April 9, 1896, from cocoons of Orgyia leucostigma 
collected in September of the preceding year; the larvee were observed 
to feed upon the cast-off skins of the caterpillars and upon the chrysa- 
lis shells. Another adult issued April 17, and one on the 18th, from 
the same lot of cocoons. Other adults were bred in May, July, August, 
and September, 1896, from larvee found in the cocoons of the above 
moth. 
