200 Illinois State Lahoratory of Natural History. 



from McLean, Champaign, Wabash, and Clark counties. 

 Tlie later broods, if any occur, must generally be limited 

 by the lessoned extent of suitable places for the larvae. 

 Both larva and pupa [Fig. 26-28] have been care- 

 fully described by Beling.* The brownish inner surface 

 of the fleshy' teeth is quite pale in ray specimens. The 

 anal prominence is prolonged each side into a long taper- 

 ing filament. The pupa has distant respiratory tubes 

 and feet ending unequally, the second pair being short- 

 est and the third longest. 



Geranomyia. 

 Two species of the genus were taken at Station C, 

 and an observation made on one individual indicates 

 semiaquatic habits, although nothing is known of the 

 larvae at present. 



O. rostrata Say. 

 The only example we have is a male taken July 23. 



G. canadensis Westw. 



The imago was seen flying with a short and rapid up- 

 and-down oscillation over the wet sandy shore, at each 

 descending movement tapping the moist surface with 

 the tip of its abdomen. This possibly corresponds to 

 the dipping flight of Chironomus previous to oviposition, 

 but it seems more likely that the female was laying her 

 <^ggs at the time. This was on July 16, and collections 

 made July 23 show that adults were abundant at that 

 time. We had previously obtained the species April 30 

 and May 18 in Champaign county. 



LiMNOPHILA. 



Z. luteipennis O.-S. [Fig. 29-31.] 



This is another form which seems to find very favor- 

 able suiToundings in the swampy slough already referred 

 to, among the Bittacomorpha and small tabanid larvae, 

 very possibly now and then affording a meal for the 



♦ Verh d. k. k. zool-bot. Gesellsch. ia Wieu, v. 28, p. 50. 



