472 



retaining the color after death; apices of the first six segments dis- 

 tinctly browned or blackened. Legs yellow, the normal black comb at 

 apices of mid and hind tibiae. Hairs of body and legs yellow. 



Frons without tubercles. Pronotum of moderate breadth on lower 

 portion, tapering rapidly and becoming obsolete some distance from 

 the upper margin of mesonotum. Hairs on mesonotum of moderate 

 length, rather sparse. Abdomen with long hairs; hypopygium as in 

 Figure I, Plate XXXIV. Fore tarsi with short hairs, those on pos- 

 terior surface of third joint, and occasionally a few at apex of second, 

 very distinctly longer than the diameter of these joincs ; basal joint one 

 and two thirds times as long as tibia (45 : 27) ; mid and hind legs with 

 long hairs. Third vein ends almost at wing-tip ; cross vein not darker, 

 or very slightly so, than other veins ; cubitus forking beyond cross 

 vein. 



Female. — Differs from the male in having the fiagellum slightly 

 paler, and the apices of the abdominal segments without black. 



The proportions of the fore tibia and basal joint of the fore tarsus 

 are the same as in the male, but the long hairs are absent. The wings 

 are broader and the cubitus forks much farther distad of the cross 

 vein. 



Length, 2.5-5.5 mm. 



Type locality, Carbondale, 111. Taken by sweeping vegetation 

 along bank of creek April 23, 1914 (C. A. Hart and J. R. Malloch). A 

 single female was taken in the railroad depot at Golconda, 111., April 

 19, 1914- 



Var. dccoloratiis, n. var. 



This variety differs from the type in color. 



The mesonotum has but faint indications of vittse, and the apices 

 of the abdominal segments are very indistinctly darker than the re- 

 mainder of the segments, while the ground color throughout is yellow 

 instead of green, and the wing veins are pale yellow. 



Type locality. Spoon River, near Havana, September, 19, 1895 (C- 

 A.Hart). 



This may be a seasonal variety of somewhat similar nature to the 

 summer form of tentans. 



51. Chironomus dkcorus Johannsen 



Chironomus decorus, Johannsen, Bull. 86, N. Y. State Mus., 1905, p. 239. 



Larva. — Length, 10-12 mm. Blood-red. Head pale brown, apices 

 of mandibles and labial plate black ; eye spot duplicated, distinctly sep- 



