MAY PLIES AND MIDGES OF NEW YORK 211 



last sometimes paler. Abdomen fuscous, the first segment 

 yellowish-green, in living specimens bright green; the remaining 

 segments more or less distinctly marked with sordidly yellow 

 hind margins; hairs pale brown or yellowish. Fore coxae brown, 

 middle and hind pairs yellow. Legs cream white, the fore femora 

 excepting their bases and tips dark brown; tips of middle and 

 hind tibiae each with minute black comb; pulvilli present, em- 

 podium pectinate. Fore metatarsus about 1.4 times as long as 

 its tibia. Wings hyaline with a milky tinge; veins slightly yel- 

 lowish; venation as shown in figure; halteres yellowish. Ithaca, 

 N. Y. 



20. Chironomus riparius Meigen 



1804 Chironoiuus Meigen. Klass. 1 : 16, 3 



1818 Chirouornus Meigen. Syst. Beschr. 1 : 23, 6 



1850 Chironomus Zett. Dipt. Scand. 9 : 3489, 7 



1864 Chirouoruus Schiner. Fauna Austr. 2 : 603 



1877 Chironomus V. d. Wulp. Dipt. Neerl. p.253, 8 



1895 Chirouomus Johnson. Proc. Acad. Nat. Sc. Phil. 320 



1898 Chironomus Lundb. Vidensk. Meddel. p.272, 50 



1826 Chironomus annularis Macq. Recueil Soc. Sc. Agri. Lille. 



p.194, 2 



1826 Chironomus viridipes Macq. Recueil Soc. Agri. Lille. 



195, 4 



1838 Chironomus zonulus Zett. Ins. Lappou. p.810, 7 



(P1.28, fig.9) 



Male and female. Dorsum of the thorax, especially in front of 

 the scutellum, light gray, with three black longitudinal stripes, 

 the median one divided by a fine line, abbreviated posteriorly 

 though continued to the scutellum by a black line; the lateral 

 stripes abbreviated anteriorly ; scutellum gray or grayish yellow ; 

 the metanotum gray. Abdomen black, the posterior margins of 

 the segments sometimes with wide, sometimes more narrow whit- 

 ish bands; the posterior segments gray; forceps small. The 

 antennae brown, the hairs of the same color ; the palpi darkened. 

 Legs brownish, yellow or pale yellow, the femora sometimes with 

 a greenish tinge, the articulations dusky; the fore tarsi of the 

 male not hairy; the metatarsus 1.5 times longer than the tibia; 

 the second tarsal joint one half as long as the metatarsus but 

 longer than the third; third and fourth about equal in length. 

 Wings whitish, with a small brown spot. Halteres yellowish. 

 The antennae of the female are yellow at the base. Some speci- 

 mens have the humeri yellowish or greenish, but these may be 

 distinguished from nearly related forms by their slender fore 

 tarsi. Length 6.75 to 9 mm. -Translation in part from Schiner, 

 loc. cit. 



