722 REPORT OF NEW JERSEY STATE MUSEUM. 



SAYOMYIA Coq. 



S. albipes Johann. Larvae have been taken in the Great Piece Meadows, 

 at Paterson IV, VII, IX, Arlington V, Newark VIII, Trenton, Delair 

 VII, and the winter is apparently passed in that stage. Breeds in the 

 more permanent woodland pools, but is also found in more open 

 water. 



S. punctipennis Say. Chester VIII, 1, Delair IX, 17, Riverton V, 19. 



CORETHRA Meig. 



C. cinctipes Coq. Lake Hopatcong VII, 22, Great Piece Meadow IV, 10, 

 Paterson V, 6, New Brunswick V, 3, Lahaway III, 28-IV, 26 all 

 larvae. This is a common spring species breeding in large woodland 

 pools, the July specimen being a straggler. The larva is predaceous, 

 and when food is scarce becomes cannibalistic. 



C. lintneri Felt. Larvae taken at Millburn in May were not recognized 

 as distinct from the preceding until the adults emerged a few days 

 later. 



CORETHRELLA Coq. 



C. brakeleyi Coq. This is a very rare species which breeds in cold spring 

 pools and sphagnum swamps. Larvae have been taken by Mr. 

 Brakeley at Lahaway in almost every month of the year, and beside 

 that it has been taken only at Delair, by Mr. Seal, and at Trenton 

 by Mr. Grossbeck. 



Family MYCETOPHILJD/E. 



These are fungus-gnats, also resembling mosquitoes or midges, but the 

 antennae are not verticillate or furnished with whorls of hair. In the 

 male the abdomen ends in a forceps-like process, and in the female in a 

 pointed ovipositor. There are other structural differences to characterize 

 the family, but these are not easily seen except by the student. The 

 larvae are feeders in fungus and in decaying vegetation generally, and 

 might be considered at worst harmless were it not that they attack culti- 

 vated mushrooms. The larvae are white, slender, have a black head, 

 and often live in large colonies. Some of them have the curious habit of 

 forming great rope-like masses when ready to enter the pupal stage, 

 sometimes travelling considerable distances to find a suitable place. 



Where they occur in mushroom beds, fumigating frequently with to- 

 bacco or pyrethrum to kill the adults inside, and keeping all windows 

 closely screened to prevent the entrance of specimens from outside, is 

 the only practical measure known to me. 



PLESIASTINA Winn. (SYMMERUS Wlk.) 

 P. annulata Meig. Riverton IV, 19. 



