MAY FLIES AND INIIDGES OF NEW YORK 237 



1804 Chironomus Meigen. Klass. 1 : 11, 1 



1818 Chironomus Meigen. Syst. Beschr. 1 : 20, 1 



1850 Chironomus Zett. Dipt. Scand. 9:3481, 1 



1864 Chironomus Schiner. Fauna Austr. 2 : 601 



1877 Chironomus V. d. Wulp. Dipt. Neerl. p.249, 1 



1878 Chironomus Ost. Sack. Cat'l. Dipt. N. A. p.21 



1805 Chironomus annularis Latr. Hist. Nat. d. Crust, et d. Ins. 



14:289, 1 

 1818 Chironomus grandis Meigen. Syst. Beschr. 1 : 21, 2 



(P1.29, fig.ll) 



The larva and pupa were oibtained from the swamps in the 

 vicinity of Cayuga lake, Ithaca, N. Y. No adults were reared, 

 although several were captured in the neighborhood. The ex- 

 tremely large size of the larva and pupa, together with the color- 

 ing of the latter, lead me to helieve that my specimens are the 

 early stages of O. p 1 u m o s u s. In fact the only species which 

 has been taken here in a number of seasons collecting which is 

 large enough to have larva and pupa of this size is p 1 u m o s u s , 

 and I therefore shall tentatively so consider it. 



Larva. Blood red, length of body about 22 mm. Head brown, 

 antenna short and stout, basal joint about half as long as the man- 

 dible; the latter with blackened teeth and with the iisual mesad 

 projecting setae. Labrum, epipharynx and hypopharynx were 

 destroyed. Maxilla with short palpus and a mesad projecting 

 lobe with setae and papillae as shown in fig.l6 of pi. 23. Labium 

 (pl.23, fig.15) broad with short blunt teeth; the middle tooth 

 broad with a nearly straight apical miargin, the first lateral small 

 and more or less rounded, the second lateral broad and a little 

 longer than the middle one; the third pair smaller and closely 

 united with the second; fourth, sixth and seventh laterals about 

 of equal size with rounded margins, the fifth slightly smaller. 

 Anterior prolegs with very numerous fine hair-like setae. Ventral 

 and anal blood gills present. The larva (4) mentioned by Gar- 

 man (1888) is probably this species. 



Pupa. Grayish brown in color; the markings of the enclosed 

 imago visible; length about 16 mm. Respiratory filaments much 

 branched and whitish in color. The dorsum of the abdominal 

 segments uniformly covered with microscopic spines, those near- 

 est to the posterior margins of the segments a little stouter than 

 the others. The lateral fin of the eighth segment terminates in a 

 chitinous process or spur, the extremity of which is divided into 

 7 or 8 spines in close contact (pl.23, fig.l4). Caudal fin with the 

 usual fringe of matted filaments. The mutilated condition of the 

 larva and pupa renders further description impossible. 



