455 



siderably increased for auy extended period during February and 

 March, the result would certainly prove fatal to great numbers of stock 

 on adjacent ranches. At the very season when the gnats are the most 

 abundant, the so-called Heel Fly, Hypoderma lineata, drives the stock 

 from the mountain sides and canons to the streams, if any such are 

 near, for i^rotectiou; and, while under existing conditions they only 

 encounter a few gnats, a greater number caused by other conditions 

 would result in their destruction. Even now the attacks of these Sim- 

 ulia must cause stock no little annoyance, but there are few if any 

 cases of fatal results; and whatever tendency gnats may have to "run'^ 

 stock is placed to the credit of Heel Flies. 



AN ENCYRTID WITH SIX-BRANCHED ANTENNAE. 



By William H. Ashmead. 



Species in the group Encyrtince with branched antenn<ne, until quite 

 recently, were considered anomalous and unique, the first to be discov- 

 ered in this country being my Tetracnemus ftoridanus^ described as early 

 as 1885.* Since then, however, Mr. Howard has added one new genus 



Fig. 35. — Hexacladia smithii, male, with female antenna above — greatly enlarged (original.) 



and species — Tanaostigmacoursetke, from ^fexico, and he now informs 

 me he has several new species, representing types of new genera, in 

 the Department collection, which he proposes to describe shortly in a 

 synopsis. 



* Proc. Ent. Sec. Acad. N. Sc. Phil., 1885, p. sviii. 



