PROC. ENT. SOC. WASH., VOL. 20, NO. 9, DEC., 1918 191 



D. Abdomen inflated, much wider than thorax; eye-marking 



consisting of 4 coalescent, more or less diamond-shaped 

 spots .......................................... Neochrysops 



W. R. Walton, new genus. 

 DD. Abdomen not inflated; eye-marking different ...... Chrysops 



AA. Hind tibiae without definite apical spines. 



E. Ocelli distinct .................................... Mn-i/comyia 



EE. Ocelli absent ...................................... Talxm us 



Goniops Aldrich. 



G. chrysocoma Osten Sacken. All of the specimens thus far 

 taken have been collected on Plummers Island, Md., or within a 

 mile and a fraction of that locality. The females are rather easily 

 found, when the collector once becomes acquainted with the 

 peculiar rattling noise they make when disturbed at their egg- 

 laying or brooding on the underside of leaves. The dates for 

 Plummer's Island are from June 18 to July 21. Males, which are 

 harder to get, were collected June 28, 1908, E. A. Schwarz and 

 July 14, 1907, A. K. Fisher. Along Dead Run, Va., a nearby 

 locality, the species has been taken June 23, Nathan Banks; 

 June 30, 1916; July 11, 1915, R. C. Shannon, and July, 1911, a 

 male, Win. Palmer. A female in the National Collection was 

 bred from a larva collected near Cabin John Bridge, Md., 

 April 13, 1899. For an illustrated account of the life-history of 

 this species see Proc. Ent. Soc. Wash. 13, 1911, pp. 21-29. 



Pangonia Latreille. 

 Key to the Species. 



A. General color yellowish; antennae light reddish or yellow ........ pigra 



AA. General color brownish; antennae dark ......................... 



P. pigra Osten Sacken. Beltsville, Md., in copula on chin- 

 quapin flowers, June 18, 1916, Wai ;< n; June 25, 1915, R. C. Shan- 

 non; July 4, 1912, McAtee; Falls Church, Va., on Ceanothus flow- 

 ers, Juno 23; Glencarlyn, Va., on Ceanothus, June 28, Nathan 

 Banks; Dalccarlia Reservoir, D. C., June 14, 1914, R. C. Shannon. 



P. rasa Loew. Lakeland, Md., caught by young I'lujnnita on 

 flowers of Eupatorium purpureum, August 14, 1910. F. Knak 



Neochrysops new genus, W. R. WALTON. (Fig. I.) 



Hind tibiae bearing spurs; head very much as in ( '///-//MI/I.S- but antennae 

 more slender as in fig. 1; first joint subequal with the third which is but 

 faintly swollen at base and bears five annuli; second segment slender and 

 two-thirds length of first. Eyes in life marked as in fig. '2. Ocelli present, 

 closely approximated ; wings evenly infnscated throughout ; anterior branch 



