MAY FLIES AND MIDGES OF NEW YORK 215 



row of hairs on the dorsal side (not shown in the figure) over- 

 hanging the teeth, a long prominent seta on its lateral surface, 

 and a few long much branched setae on the dorsal surface of the 

 niesal margin. The maxilla (fig.lmx) has a short stout palpus, 

 a few short setae and papillae and a group of delicate mesad pro- 

 jecting filaments. The labium (fig.l 1) has a black margin, the 

 middle tooth is rounded, the second laterals are small and closely 

 united to the first laterals. The anterior and posterior prolegs 

 are as usual with the species of C h i r o n o m u s , the claws of 

 the posterior pair are bilobed; caudad of the anal papillae with 

 their tufts of setae, is a conspicuous pair of spines or bristles. 

 The papillae mentioned above are somewhat infuscated at the 

 tij). The anal blood gills are present, though none were discov- 

 ered on the ventral surface of the eleventh segment. 



Pupa. The pupa is brownish, about 4 mm. in length. The two 

 respiratory organs, each composed of numerous white filaments, 

 are conspicuous. The abdominal segments have the microscopic 

 spines covering nearly the whole dorsal surface (fig.3). There 

 are two patches near the anterior margin of each segment, a 

 large discal patch of slightly larger spines, and posterior trans- 

 verse rows of still larger blunt ones. Between these patches and 

 gradually merging into them are numerous smaller spines. Thus 

 the entire surface is practically covered with microscopic spines 

 of varying sizes, the anterior patches more distinctly separated 

 from the remainder. The lateral fins of the eighth abdominal seg- 

 ment each has the usual four lateral filaments, and terminates 

 in a slightly sinuous spur (fig.2). The caudal fin has the usual 

 fringe of pale matted filaments. 



Imago, male and female. Shining black; thorax of the male the 

 same color, that of the female paler with three brown stripes. 

 Antennae yellow, the antennal hairs of the male the same color; 

 palpi yellowish; sternum schistaceous. Abdomen of the male 

 slender, pilose, black, the first and second segments wholly, and 

 the posterior margins of the third, fourth and fifth fusrous, the 

 last three segments, widened and somewhat dilated; genitalia 

 small, resembling those shown on pl.32, fig.8; the inferior lobes 

 with curved setae; the superior lobes in this species are much 

 shorter and without peduncle, pale in color; abdomen of the fe 

 male stouter, black, paler at the base, pubescent. Wings white, 

 with pale veins, spotless. Halteres white. Legs with the coxae 

 pale yellow, or white, spotless, the middle and hind legs pale 

 haired ; the fore legs bare ; the fore metatarsus over 11/2 times as 

 long as the tibia, and twice as long as the second tarsal joint. 

 The thorax of the female is sometimes wholly brown. Length 3.5 

 mm. Translation in part from Zetterstedt, loc. cit. 



