MAY FLIES AND MIDGES OF NEW YORK 227 



This pale green species resembles C. v i r i d i s, but is smaller ; 

 the thoracic stripes, the sternum and the metanotum pale ferru- 

 ginous, sometimes subobsolete; the claspers of the male quite 

 long and slender ; the legs pale yellow or white ; the femora some- 

 times slightly greenish; the extreme tip of the tibiae and of the 

 metatarsi and the whole of the last tarsal joints brownish. Well- 

 colored specimens, Avith distinct ferruginous thoracic stripes, have 

 the legs more greenish, and the fore legs brownish. The fore tibia 

 is one third shorter than the femur and the fore metatarsus nearly 

 twice as long as its tibia; the remaining tarsal joints are much 

 shorter; fore tarsi are bare; the hind legs are hairy. Halteres 

 and wings Avhite. Length 3.5 to 4.5 mm. Translation from V. d. 

 Wulp. Greenland (Lundbeck) ; Washington State; Long Island, 

 N. Y. 



43. Chironomus modestus Say 



1823 Chironomus Say. Journ. Acad. Nat. Sc. Phil. 3 : 13, 3 



1828 Chironomus Wied. Aussereurop. zweifl. 1:18, 8 



1859 Chironomus Say. Cbmpl. Wr. 2:41, 3 



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



Larva. (P1.22, figs.8 to 12) . The larva is buff-colored or yellow, 

 with a slight reddish tinge ; length 6 to 7 mm. The head is brown 

 with a few dorsal setae; antennae (fig.9) slender, as long as the 

 mandibles, basal joint three fifths of the w^hole length. The 

 labrum (fig. 10 ulr) with a few prominent pale setae, several hairs' 

 of which are pectinate. The epipharynx with the usual pectinate 

 setae, lateral arms and transverse comib, tlie last with but five 

 blunt rounded teeth. Mandibles (fig.ll) with blackened teeth. 

 Maxillae (fig.ll mx) with short palpus, several setae and a small 

 group of mesad projecting slender lobes. Labium (fig.ll 1) with 

 rounded margin, the teeth with rounded outline, and a pair of 

 ventral setae. Posterior prolegs with bilobed claws, anal blood 

 gills distinct; the posterior dorsal tufts of setae are each placed 

 uipon a papilla which is about as broad as long, and which has a 

 very delicate seta on its side. 



Pupa. Pale green, length 5 to 5.5 mm. Respiratory organs 

 consist of a pair of tufts of white filaments. Dorsal surface of 

 the fourth abdominal segment (fig.l2) marked with two trans- 

 versely oval patches of microscopic setae near the anterior mar- 

 gin and a large patch with few clear spaces covering the greater 

 portion of the dorsum ; this patch is widest at the posterior mar- 

 gin. The third, fifth and sixth segments are similarly marked, 

 but the patches are smaller on the fifth and sixth, and larger on 

 the third; the seventh and eighth are usually bare; the second 

 has the usual transverse row of longitudinal ridges on its poste- 

 rior margin, and the dorsal surface is marked like that of the 



