466 



Antennae elongate, over one and a half times as long as head and 

 thorax combined; frontal tubercles indistinguishable; palpi slender, 

 distinctly longer than height of head. Pronotum linear on upper half. 

 Hypopygium as in Figure i, Plate XXXVI, with three pairs of proc- 

 esses in addition to the lateral arms as in species of Tanytarsus. 

 Legs slender; fore tarsi without long hairs; proportions of fore tibiae 

 and joints of fore tarsi as follows: 46, 65, 44, 34, 28, 10; mid and 

 hind legs with long pale hairs. Third and fourth veins ending respec- 

 tively about equal distances before and behind apex ; cross vein slightly 

 before middle of wing; cubitus forking slightly beyond cross vein. 



Length, 5 mm. 



Type locality, Delavan Lake, Wis., September 9, 1892 (C. A. 

 Hart). 



This species very closely resembles certain species in the genus 

 Tanytarsus, especially ohcdiens and its allies, and this is particularly 

 noticeable in the structure of the hypopygium, which is quite similar 

 in form to that of most of the species of Tanytarsus. I have been 

 unable to distinguish on the wings of the type specimen any surface 

 hairs whatever, and therefore retain it in Chironomus, though fresh 

 specimens may ultimately show that it belongs to Tanytarsus. 



Subsection 2 



Fore tarsi with hasal joint distinctly more 

 than 1.5 as long as fore iihice 



43. Chironomus fuscicornis, n. sp. 



Male. — Blackish brown, shining. Head dark brown, face yellow- 

 ish; antennae fuscous; basal joint of flagellum yellow, plumes fuscous; 

 palpi dark brown. Thorax glossy brown, yellowish between the vittae 

 and on posterior half between the lateral vittae except a small triangu- 

 lar area in front of scutellum which is usually connected with the me- 

 dian vitta by a fine line ; the pale portions with light pruinescence. Pos- 

 terior margins of abdominal segments 1-5 pale yellowish, the pale 

 color generally carried forward some distance on the lateral margins ; 

 apical portion of lateral arms of hypopygium yellowish. Legs yellow, 

 mid and hind coxae slightly brownish, fore tibiae, fore tarsi, and apices 

 of mid and hind tarsi tawny ; the usual black comb at c? pices of mid and 

 hind tibiae. Wings clear, veins yellow, cross vein not infuscated. 

 Halteres yellow. 



Frontal tubercles absent ; apical palpal joint longest, relative pro- 

 portions of the apical three joints as follows: 65, 40, 45. Pronotum 



