397 



and postnotum dark brown. Abdomen brown with the posterior 

 maro^ins yellow, those of segments two and six conspicuously so. 

 Legs yellow, with the following parts brown : an indistinct broad band 

 on middle, and a narrower darker one at apices, of femora; a broad 

 band extending from near base to middle and a narrower one on 

 apices of all tibiae ; the fore tarsi from apical third of basal joint to its 

 tip; the apex of basal tarsal joint and from apex of second joint to 

 the tip of tarsi on mid and hind legs. Wings clear, cross vein infus- 

 cated. Halteres yellow. 



Almost identical in structure with the female of scapidaris, but 

 rather larger and more robust. The basal joint of fore tarsus is 

 slightly more than half the length of fore tibia and distinctly, though 

 not greatly, shorter than the remaining tarsal joints combined. The 

 petiole of the cubitus is not distinguishable, though the fork is not 

 proximad of the cross vein. In other respects almost as scapidaris. 



Length, 4.5 mm. 



Illinois locality, Havana, July 5, 1894; two females reared from 

 larva; taken from the Illinois River at this place. The larval and 

 pupal exuviae were not saved. Specimens of larv?e which from their 

 general appearance were considered to belong to this species had 

 been previously preserved in alcohol, but for obvious reasons they can 

 not be definitely associated with the adults. The writer took a female 

 specimen at Havana June 15, 1914. 



Originally described from New York, and not subsequently re- 

 corded as far as I am aware. 



L'I'nidentified Larvae of Tanypin^ 



During the years 191 2-1 3 a large amount of material representing 

 larvae and pupae of this subfamily and the other subfamilies of Chi- 

 rononudcc was obtained by dredging in the Illinois River, but no at- 

 tempt was made to rear imagines from it owing to the press of other 

 matters. In order to complete this work of identification as far as 

 possible under the circumstances, and to enable any future worker on 

 Illinois CJnrononndcc to associate these larvae with imagines which 

 may subsequently be reared from larvae possessing the same charac- 

 ters, a brief description of two species is given here, with a list of 

 localities for each. 



Tanypus sp. a 



This species is very close to mondis, but differs noticeably in the 

 form of the labial plate (PI. XX\\ Fig. 2) and in the structure of 

 the palpus and antenna (PI. XXIV, Figs. 12, 13). Mandible as 



