1956] 
Gillham — Symbrenthia silana 
13 
tapering. 2. Saccus moderately long and thick. 3. Valve 
bearing a caudal and a darsal prong. 4. Uncus flanked 
by two poorly developed prongs. 
Distribution. This species is only known from Sikkim 
and Bhutan. 
Drosophilid and Chloropid flies bred from Skunk 
Cabbage. — During May and June, 1956, I collected a 
great many rotting spathes of skunk cabbage, Symplo- 
carpus foetidus L. (Nutt.) from a shady red maple swamp 
in Lexington, Massachusetts. These were placed in a 
cloth-covered jar, and from 10-20 days later, a succession 
of small Diptera emerged. The first flies were small 
psychodids, still undetermined. Two days later, several 
Drosophila quinaria Loew adults appeared, plus a single 
small damaged Drosophila, possibly D. transversa or near. 
Following the first drosophilids by 2-3 days were numerous 
chloropid adults: about 100 Elachiptera costata (Loew) 
and 2 each of E. nigriceps (Loew) and E. erythropleura 
Sabrosky, as well as two specimens of Tricimba lineella 
(Fall.). Drosophila was also reared later from rotting 
skunk cabbage leaf petioles that were macerated and left 
exposed for a week in the same swamp during June; the 
emergents were all or nearly all D. quinaria, and this 
species was also collected resting on skunk cabbage leaves 
at the same locality. D. quinaria does not come to baits 
of watermelon and other rotting fruits placed in the 
swamp, though numerous other Drosophila and Chymomyza 
were attracted in this way. I owe the determinations to 
Dr. Curtis W. Sabrosky, Dr. A. H. Sturtevant, and Dr. 
Marshall R. Wheeler. — W. L. Brown, Jr., Museum of 
Comparative Zoology, Harvard University. 
