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length; the longitudinal stripes of the thorax rather faint; the 

 male genitalia as shown on pl.32, fig.9; the lateral arms pro- 

 longed, curved upwards and enlarged at the ends; the inferior 

 lobes slender, about one half as long as the outer pair, with a 

 slight enlargement at the end ; the superior arms are still shorter 

 and curved; the dorsal keel is elongate, curved downwards, and 

 with a slight notch near the tip. Both of these varieties from 

 Ithaca, N. Y. 



44. Chironomus fulviventris n. sp. 



Larva. Slender, head brown, tip of the mandible and edge of 

 the labium black; each eye consists of two distinct spots. An- 

 tennae short, stout, basal joint four sevenths of total length ; the 

 appendage at the apex of the first joint longer than the four 

 apical joints. Labmm and epipharynx resembles that of 

 d e c o r u s n. sp., the transverse comb like that shown on pl.22, 

 fig.19; the lateral arms prominent and uniformly brown. Man- 

 dibles and maxillae normal; the labium has the middle pair of 

 teeth shorter than the first and second laterals (pl.22, fig.24). 

 The ventral blood gills were not discovered; the four anal gills 

 longer than the anal prolegs ; the other appendages normal. 



Pupa. The pupa has the dorsal surface of the abdomen marked 

 like that shown on pl.21, fig.ll ; the terminal spines of the lateral 

 fins of the eighth segment are shown on pl.22, fig.26. The caudal 

 fin has the usual fringe of matted hairs. 



Imago. Male, deep yellow; length, 3 to 4 mm. Head yellowish, 

 palpi, proboscis and antennae pale fuscous, the basal joint of 

 the last yellow, its hairs yellowish brown. Dorsum of thorax 

 yellowish with 3 wide testaceous stripes, the middle one divided 

 by a fine line; meson oturn and pectus reddish brown; scutellum 

 and pleura yellowish, the latter with some blotches, reddish 

 brown. Abdomen brownish, the anterior and posterior margins 

 of each segment yellowish. Last 3 segments broadened, all hairs 

 yellowish brown. The genitalia have a pair of elongate lateral 

 arms, a pair of blunt clubbed inferior lobes with curved setae, a 

 pair of hook-like superior lobes and a downward curved keel (one 

 half of these parts are as shown on pl.32, fig.10). The coxae, the 

 femora, particularly the apical half, the basal half of the fore 

 tibiae and the immediate bases of the middle and hind tibiae, the 

 tips of all tibiae, and all tarsal joints yellowish brown; the re- 

 maining parts more yellowish or whitish ; all hairs pale, fore tarsi 

 bare. The wings hyaline, all the veins pale. Halteres white. 



Female. Like the male, but the abdomen is nearly uniformly 

 yellow. In both sexes the fore metatarsus is only about one 

 eighth longer than its tibia. Specimens of larva, pupa and adult, 

 from Saranac Inn, N. Y.; several adults from Ithaca, N. Y. 



