MAY FLIES AND MIDGES OF NEW YORK 



37 



The accompanying text figures will facilitate the recognition 

 of this species when more and better specimens are at hand. 



This species is a typical representative of A m e 1 e t u s , 

 agreeing in close detail with the generic characters set forth in 

 Eaton's Monograph p.210, but it is smaller than any of its con- 

 geners. Its nymph is apparently the one figured by Eaton on 

 pl.49 of his Monograph, and referred to Chirotenetes. 



The nymph. (P1.7, fig.l.) Length, 0.5 mm.; antennae, 1 mm. 

 and setae, 4 niiin. additional. Body elongate, with vertical face, 

 arched thorax, depressed and tapering abdomen. Antennae short, 



Fig-. 6 Parts of nymph of Ameletus ludens sp. nov. ; y, maxilla; z, single gill 

 lamella from one of the middle abdominal segments 



taipering, bare; ocelli in front; labrum quadrangular, a little 

 longer than wide, emarginate in front, where fringed with fine 

 plumose hairs. Mandibles stout, triangular beyond the molar 

 surface, \bearing the canines upon the prominent apex, outer 

 canine more than twice as large as the inner, the latter preceded 

 by a slender subulate spine on the distal margin. Maxilla with a 

 very Aveak and slender and obscurely three-jointed palpus. The 

 comlbined lacinia and galea obscurely trapezoidal, the tip of the 

 former indicated by a short, slender and shai-p spine, the distal 

 border of the galea fringed densely with a series of strongly 

 arched, regularly graduated and beautifully pectinated hooks 

 (fig.Gv). Labinni with better developed, three-jointed palpi, 



