238 NEW YORK STATE MUSEUM 



Imago, male and female. Dorsum of the tliorax dull pale yellow, 

 with three blackish gray, wide, longitudinal stripes, middle one 

 posteriorly, the lateral ones anteriorly abbreviated; in front of 

 the scutellum with a shining whitish gray spot ; pleura near the 

 coxae darkened, with grayish sheen ; mietanotum gray. Abdomen 

 pale yellowish, each segment with a broad brown spot, which often 

 widens into cross bands, the last few segments and the sides of 

 the others in certain lights with whitish gray sheen, the hairs pale 

 yellow; the last few segments flattened, the anal one with its 

 incisure deep, the forceps brownish yellow, slender. Head yellow- 

 ish; antennae brown, the hair is light brown; palpi ferruginous, 

 often quite dark. Legs j'-ellow, the knees darkened, the other 

 articulations, narrow blackish brown ; fore tarsi of the male with 

 long hairs ; metatarsus one fourth longer than the tibia ; middle 

 and hind legs delicately hut long and thickly haired. Wings 

 whitish with a black spot. The female quite robust, colors darker, 

 abdomen brown, with gray reflections, the incisures appearing at 

 most slightly whitish, the antennae yellow, at the end brownish. 

 The coloring of this species is variable, sometimes lighter, some- 

 times darker, occasionally it has a touch of ferruginous, which is 

 then particularly noticeaible on the antennal hairs; on the whitish- 

 gray posterior segments of the aibdomen often appear regularly 

 arranged brown markings. The metamorphosis of this species 

 was first described iby Keaumur. Length, 11 to 12 mm. Schiner, 

 loc. cit. 



Brought from Mackenzie river by R. Kennicott (Ost.-Sack., loc. 

 cit.). Reported from Chautauqua lake N. Y., by 0. V. Riley 

 (18(S6). Some male and female specimens from Ithaca N. Y., 

 and Washington State, agree with the description and with speci- 

 mens from Europe in all particulars. 



59a. Chironomus ferrugineovittatus Zetterstedt. 



1850 Chironomus Zett. Dipt. Scand. 9 :3492 

 1864 Chironomus Schiner. Fauna Austr. 2 :602 

 1877 Chironomus V. d. Wulp. Dipt Neerl. p.251 



Male and female. Head yellow, the antennae and palpi brown, 

 antennal hairs of the male dusky yellow, antenna of the female 

 yellow with a brown apical joint. Thorax pale yellow, with three 

 broad ferruginous longitudinal stripes, pleura with ferruginous 

 spots ; pectus and metanotum gray ; the flattened area in front of 

 tlEie scutellum with a whitish sheen. Scutellum as also the 

 abdomen of the male for the most part yellowish, both with a 

 suggestion of green; upon some of the abdominal segments a 

 brown dorsal mark; the posterior segments with a whitish sheen; 



