2/4 NEW YORK STATE MUSEUM 



Subfamil} chironominae 



Genus corynoneura 



Winnertz, 1846 



Numerous specimens of C . a t r a (= c e 1 e r i p e s) were seen 



in July hovering beneath the shrubbery which overhangs a Httle 



brook near Ithaca, N. Y. The figure given by Winnertz of the 



wing [reproduced in Bui. 86, pi. 36, fig. 7] is not strictly correct. 



The anterior veins though stout do not wholly obliterate the cell 



between them. Only when heM obliquely does the wing appear as 



shown in the figure. The larva is described by Thienemann ('08). 



Genus chasmatonottjs 



Loew, 1864 



Key of species 



(/ Yellowish species; abdomen dark brown, wings graj'ish hyaline, some- 

 what smoky in front of the radius. California, .h y a li n u s Coq. (1905) 

 aa Dusky species 



b Wing with two prominent white spots, apex black [Bui. 86, pi. 27, fig. 16] 



b i m a c u 1 a t u s Loew 

 bb Wing not marked in this way 



c Wing with two white spots and a very narrow apical margin, whitish 



hyaline. British Columbia fascipennis Coq. ( 1905) 



cc Wing with fewer spots 



d Wing with longitudinal vitta between the media and the cubitus ; 

 abdomen with posterior margins of the segments whitish. Alaska. 



univittatus 



dd Wing with a broad wliite transverse fascia. N. Y 



unimaculatus 



NOTE. Bui. 86, on page 167, line 10, for m a c u 1 a t u s read b i m a c u - 

 1 a t u s. 



Genus hydrobaenus 



Fries, 1830 



Both larvae and adults have recently been described by Giard 



(1904). According to this author the male has but 12 antennal 



joints and not 14 as given by the earlier authors. The genus has 



not yet been found in North America. 



Genus prodiamesa 

 Kieffer, 1906 

 This genus is distinguished from Diamesa in having a linear 

 fourth tarsal joint, longer than the fifth. A specimen of Prodiamesa 



