Vol. xxiii] ENTOMOLOGICAL NEWS 163 



flies several inches deep. An instance of this is cited by Ives, 

 in Entomological Nezvs, i. 39, 1890, and Dr. Riley, comment- 

 ing on the case in Insect Life, ii, 386, 1890, mentions some- 

 thing similar, but possibly not the same. The Ives material 

 came from Pemberton, New Jersey. 



This habit in Atherix is much better known in the European 

 Atherix ibis, in which it has often been described. Verrall 

 {British Flies, v, 288, 1909), quotes a condensed description 

 of the habits of the species from Walker {Ins. Brit. Dipt., i, 

 70) — "The female of this fly is gregarious, and attaches its 

 eggs in large clusters to boughs hanging over streams, and 

 there remains, and shortly dies. The cluster is generally pear- 

 shaped, and sometimes contains many thousands of dead flies, 

 and continually receives accessions by new comers settling 

 upon it. When the larva is hatched it falls into the water, its 

 future residence; it has a forked tail about one-third the 

 length of the body, and has the power of raising itself in the 

 water by an incessant undulating motion in a vertical plane." 

 Williston, in the 3d edition of his Manual of North American 

 Diptera, p. 160, also refers to this habit. 



