270 

 Notes on Two Species of Hawaiian Diptera. 



BY J. F. ILLIiVGWORTlI. 



The student of di])tera lias a rich field in Hawaii. Many 

 of the native species are a])])arently new; and the literature 

 of the Islands, often, hardly mentions some introduced flv 

 which is very abmidant. The latter is the case with the two 

 species i-ecorded in this pa})er. 



I>r((rli t/(]('ii(rr(i aiynifala AValk. 



1/ah. Sonthern Ignited States as far as Kansas ; Cuba, 

 Brazil, Bolivia, and Paraguay. 



Ilaicaiiaii, records. First specimen obtained by Dr. Per- 

 kins at Olaa, Hawaii, July, 1895. Dr. Howard, Oct. 1900, 

 I'ocords three specimens from Hawaii, and a single specimen 

 was taken in the Tao Valley, ^NFaui, Sept. 1901. 



Of the specimens in collections, the Hawaiian Sugar IMant- 

 ei-s' Association has two specimens taken on Molokai, 1907, and 

 four at Waikiki, 1906 and 1907. The College of Hawaii col- 

 lection has one specimen, 1911, and five specimens, 1914. 



The indication wonld be that these flies are rare, but T 

 found them exceedingly abundant, aftei- the recent heavy rains, 

 both at the ('Ollege of Hawaii and along the Palolo stream. 

 Those at the College were found under the insectary, in the 

 water l)asins, which had not been cleaned out for some time. 

 The water was broAvn in color, and had considerable leaf-trash 

 in the bottom. 



These flies, as is (diaracteristic of the family, have a water- 

 ])roof c(»at and run about freely upon the surface. 



Jfahils of larrar: I'he larvae are able to remain submerged 

 i\>v indefinite periods, while feeding, but as soon as they finisli 

 ihcy rise and a])])ly thcii" caudal s])ii'acles to ihc surface of the 

 water, where tliey hang molinulcss. The food is a])parently 

 the same as that eaten by uKisipiito larvae. They were ob- 

 serve(l eatiii"' the reiuaius of a s()wl)Uii' which was d(>cavin<»; 



Proc. Haw. Ent. Soc. Ill, Xo. 4, May, 1917. 



