240 NEW YORK STATE MUSEUM 



tered setae. Segments of the abdomen with a seta-pattern as 

 shown in fig. 11 and 12; the pattern more indistinct on the last 

 two segments. On each lateral margin of the fifth to the eighth 

 segment there is a brown longitudinal dash, most conspicuous 

 and half the length of the segment on the fifth. The black chiti- 

 nized lateral spur of the eighth segment is prominent and without 

 teeth (fig.l2) . The anal appendage has the usual fringe of matted 

 hairs. 



Imago, male. Length 6 to 7 mm. Head yelloAV, antennae and 

 proboscis more or less brownish, large basal joint of the antennae 

 and the palpi reddish brown, the latter sometimes fuscous. Thorax 

 greenish yellow with a- whitish sheen, the pleura and the scutellum 

 the same color; the three thoracic stripes, some pleural spots, the 

 metathorax and the pectus dull testaceous or reddish, sometimes 

 even brownish ; the middle dorsal line divided by a fine line. 

 Abdomen hairy, pale yellow or greenish yellow, in life more dis- 

 tinctly green, infuscated toward the tip; each segment with a 

 brownish transverse fascia slightly in front of the middle. These 

 fasciae are Avidest on the dorsal line, and are obsolete on the last 

 few segments. Genitalia brownish yellow, hairy, moderately 

 elongated (pl.32, fig.13). Legs including the coxae pale greenish 

 yellow, short haired; tarsi, particularly towards the tip, infus- 

 cated; tips of tibiae and of all tarsal joints fuscous, fifth joint 

 wholly fuscous. Tarsal claws simple, pulvilli small, empodium 

 stout, curved, blunt, and pectinate on the convex side. The fore 

 metatarsus about 0.6 longer than its tibia. Wings hyaline, cross- 

 vein conspicuously clouded with dark brown, anterior veins yel- 

 low, posterior ones hyaline, the two branches of the cubitus and 

 the anal vein accompanied by a faint brown streak. Venation as 

 shown on pl.29, fig.l2. 



Female. Differs from the male as follows : Slightly shorter, 

 antennae yellow, last joint fuscous; thorax more greenish than 

 yellow, abdomen greenish with dark bands as in the male, but 

 the bands are always wider and usually cover the whole surface 

 of the segment excepting the apical third or fourth. In other re- 

 spects like the male. This species seems to be very common in 

 many parts of the country. New York, Ohio, Illinois, Iowa, Kan- 

 sas, Washington State, and Nebraska. 



60a. Chironomus dorsalis Meigen 

 1818 Chironomus Meigen. Syst. Beschr. 1 :25, 10 

 1850 Chironomus Zett Dipt. Seand. 9:3529 

 1864 Chironomus Schiner. Fauna Austr. 2 :605 

 1877 Chironomus V. d. Wulp. Dipt. Neerl p.255 

 1830 Chironomus c i n g u 1 a t u s Meig. Syst. Beschr. 6:245 



