240 NEW YORK STATE MUSEUM 



tered setae. Segments of the abdomen with a seta-pattem 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 (tig.l2j . The anal appendage has the usual fringe of matted 

 hairs. 



Imago, male. Length G to 7 mm. Head yellow, antennae and 

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

 and the pali)i 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 hairj-, pale yellow or greenish yellow, in life more dis- 

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

 brownish transverse fascia slighth' in front of the middle. These 



CD »/ 



fasciae are widest 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- 

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

 wholly fuscous. Tarsal claws simple, pulvilli small, empodium 

 si out, curved, blunt, and pectinate on the convex side. The tore 

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

 vein cons]>icuously clouded with dark brown, anterior veins yel- 

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

 the anal vein accomi)anied by a faint brown streak. Venation as 

 slioAvn on ])1.29, fig.l2. 



Female. Dill'ers from the male as follows: Slightly shorter, 

 antennae yellow, last joint fuscous; thorax inoic greenish than 

 yellow, abdomen greenish Avitli dark bands as in the male, hut 

 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 s])ecies 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. Boscbr. 1:25,10 



18r)0 Chironomus Zett. Dipt. Scand. 9 :3529 



1864 Chironomus Schiner. Fauna Austr. 2 :605 



1877 Cli 1 r o n o m u s V. d. Wulp. Dipt Neerl. p.255 



1830 Chironomus cingulatus Meig. Syst. Beschr. 0:245 



