384 



sometimes with a pale brown subbasal band, the apices narrowly 

 brown in all cases, as are also the apices of the tarsal joints. Wings 

 spotted almost as in sfcllatus, the 3-4 spots in the first posterior cell 

 most distinct, cross vein blackened (PI. XXVII, Fig. 2). 



Male. — Antenna longer than head and thorax together, structur- 

 ally almost identical with that of monilis; plumes pale brown and very 

 long. Thorax with very inconspicuous pale hairs, pleurae bare. Ab- 

 domen slender; hypopygium as in Figure 3, Plate XXVII. Legs long 

 and slender; basal joint of fore tarsus almost as long as fore tibia, and 

 as long as next three joints together; second joint sHghtly longer than 

 third ; fore tarsus from near middle of basal joint to apex of fourth 

 with long hairs which exceed in length three times the diameter of the 

 tarsal joints upon which they are situated ; hairs on mid and hind legs 

 distinct, but not as long as those on fore tarsus. Wing narrow ; cross 

 vein near to middle ; costal vein extending well round the curve at 

 apex; petiole of cubitus less than one fourth as long as posterior 

 branch of cubitus. 



Female. — Antenna shorter than thorax, basal joint small, surface 

 hairs of moderate length, apical joint swollen. Mesonotum as in the 

 male. Abdomen stout, surface hairs very short. Legs proportions as in 

 male, but fore tarsus nearly bare. Wing broader than in male ; cross 

 vein slightly before middle; costa extending very nearly to the apex; 

 petiole of cubitus about a third as long as posterior branch; surface 

 hairs more conspicuous than in male. 



Length, 3-4 mm. 



Illinois localities: East St. Louis, July 18, 1906; Vergennes, 

 August 12, 1914 (R. Grizzell) ; Havana, September; and Matanzas 

 Lake, Havana, August 24, 1894 (pupa). 



Originally described from Europe. Specimens in Laboratory col- 

 lection from localities outside of this state are from Lake Delavan, 

 Wisconsin, September 1892, Grand Junction, Mich., July 19 14 (C. A. 

 Hart), and from Brownsville and Lake Lomalta, Texas, November 

 (C. A. Hart). 



One of the East St. Louis specimens was reared, but the larval 

 skin was not preserved. Amongst the material saved from the breed- 

 ing cage I found a single cast pupal skin, from which the drawings 

 here given were made. 



When I first commenced this work on CJiironomidcc I considered 

 it strange that Johannsen's drawing of the respiratory organ of Tany- 

 piis monilis should appear so different from that which Meinert gives 

 for the same species. I had no difficulty in associating Johannsen's 

 figure with the pupa which I obtained from the Illinois River material 



