14 Bulletin of the Brooklyn Entomological Society Vol. XII 



that the imagines have also the predaceous habit I was unable 

 until July of last year to verify that suspicion. I can now record 

 the fact that flies of this genus feed upon small insects, having 

 taken a specimen in the act of devouring a male Forcipomyia 

 (Ceratopogonidas) , 



The species of P silo pa frequent foliage and are not uncommon 

 upon flowers, especially milkweed, and I had not strongly sus- 

 pected them of predacity. I observed this year one specimen 

 suddenly attacked a small insect which it just as suddenly dropped. 

 Examination proved the discarded prey to belong to the Thysan- 

 optera and probably to be the common Thrips occurring on dan- 

 delion. I do not know why the insect was dropped but presume 

 it was distasteful to the predator. In this connection it may be 

 pertinent to mention that I have seen Scatophaga furcata pounce 

 on and instantly discard specimens of Anthocoris, a bug having a 

 most disagreeable odor. The small Thrips above mentioned is 

 able to bite persons, as I know from experience. 



THE NORTH AMERICAN SPECIES OF EUCHRYSIA. 

 FEMALES. 



By a. a. Girault^ Glenndale, Md. 



Based on the types. 

 Propodeum with a broad median area which is rugulose (distinctly 

 more coarsely sO' in similis; not so in maculipennis) , terminates 

 in a line of large foveae distad and which is distinctly wider than 

 the scaly space between it and the lateral carina. Head and thorax 

 densely, closely punctate, the abdomen finely scaly, segment 2 

 glabrous. 



I. Wings hyaline or subhyaline. Postmarginal vein longer than the mar- 



ginal. 

 Antennas black with funicles 2-5 reddish brown; cephalic femora 

 slightly swollen. Wings hyaline. Antennae about as in similis. 



hyalinipennis Ashmead. 



II. Wings with a large, ovate fuscous blotch from the marginal vein or 



uniformly infuscated from the base of the marginal vein to the 

 apex. 

 Wings infuscated from the base of the marginal vein to apex. 

 Postmarginal vein longer than the marginal. 



