208 NEW YORK STAPi: MlSKIM 



Female. Siniilar to the male but the doi-sal thoracic stripes are 

 more distinct, a]>ical margins of abdominal segments more widely 

 cinereous or sometimes pale gia y ; the radial veins lightly curved 

 at the tip; the legs sometimes dilutely black fuscous, sometimes 

 paler. Length G.5 to 7.5 mm. Greenland. Holmgren ( h)c. cit). 



16. Chironomus flavicingula Walker 



1848 Chirououius Walker. List Dipt. Brit. Mus. 1 : 20 

 1878 C b i r u o in u s Ost. Sack. Catal. Dipt. N. A. p.20 



(P1.28, fig.6, and pl.32, fig.7) 



The blood-red larvae of about 12 mm. length were dredged from 

 the sand in the bottom of a shallow pond near Ithaca N. Y. 



Larva. (P1.21, figs. 13 to 19.) Head dark brown; antennae 

 short; labruni with about ten pairs of pale setae, two or three 

 pairs of which are quite short (fig.in, under surface flg.ll:) ; at 

 extreme apex with a pair of fan-like appendages (f), which hang 

 downwards, though shown in the figure folded out in a hori- 

 zontal plane; caudad of this there is a comb with long, fine, 

 caudad i)rojecting teeth. The epipharynx ( fig.l3) with thi-ee 

 cephalad projecting fan-like organs (f^ forming the -'posterior 

 comb," five or six lateral setae (s), several pairs of ventrad pro- 

 jecting curved and branched setae (s) ; caudad of these is an 

 arched chitinized piece (fig.i:ib) ; laterad of this are the dark 

 brown, chitinized, caudad and ventrad curved lateral arms not 

 shown in the figure. The black tipjted mandibles are as usual, 

 with the mesad projecting branched hairs, and two laterad pro- 

 jecting setae; each maxilla (fig.lOmx) has prominent palpus, a 

 large seta and numerous papillae on the mesal margin, a pair of 

 large setae at the base of the palpus, another pair (not shown in 

 figure) at l)ase of t]\e mandible. Tlie hyjtopharynx ffig.lOhy) has 

 a rounded apical margin with numerous short hairs and jiapillae. 

 The labium (fig.l8 and fig.l!) 1 ) has a broad, blunt, central tooth 

 and six small laterals on each side. There are I wo long setae 

 upon each side of the head l)clow the eyes. The fore feet are 

 short, with very numerous, short, curved, yellow setae. The 

 body seems to be entirely devoid of hairs, l^adi posterior foot 

 is provided with a number of bilobed brown claws. The dorso- 

 caudal papillae of the last segment are about as long as wide, 

 with <I or 7 long setae at the lip. and (»ne i)r two short ones on 

 the side; caudad of these and immediately above the ui)per pair 

 of blood gills are two more long setae. The blood gills of the 

 eleventh segment are jtresent; those of the twelfth are nearly as 

 long as the posterior feet; slightly conical and four in number. 



Pupae. Tlie pu]>a is dusky in color when nearly mature, show- 

 ing the colors of the imago. The lespiratory filaments are white, 



