266 Illinois State Laboratory of JSaturaL Histoi'y. 



slender, basal portion slightly curved, the usual two 

 minute joints at apex; eyes small, pale, scarcely promif 

 nent. 



The median ventral line on segments 9 and 10 is mi- 

 nutely elevated from the base to the posterior third of the 

 segment, and the ventral surface of these segments is 

 flattened at middle. At their posterior margins are 

 two sharp light brown diverging hooks, their points 

 directed forwards, longer and further apart than in 

 cincta, the margin of the segment somewhat prominent 

 at the points of attachment. No accessory hooks in 

 any of the specimens. Last segment with sides nearly 

 parallel to near middle, thence tapering slightly to apex. 

 Beneath sulcate beyond anal slit. Apical fringe plumose, 

 three fourths the length of the last segment. 



Pujpariwm. — More inflated and cylindrical than the 

 larva, not noticeably sinuated, posterior margins of seg- 

 ments 6-9 bordered more or less narrowly with blackish. 



0. snowi, n. s. 



This well-marked species was collected July 2 in 

 Champaign county. 



0. hieroglyphica Oliv. 

 Taken only in Champaign county July 24. 



Nemotelus. 



Larvae of Nemotelus have been reported as aquatic by 

 Haliday,* but the genus was not recognized by us at 

 Havana, although one species at least is common in the 

 State. 



N. unicolor Loew. 



Taken in low grounds and in meadows, among grass 

 and weeds, May 23 to 28 and July 1 and 2; Wabash, 

 Champaign, McLean, and DeKalb counties. 



♦ Nat. Hist. Review, 1857, No. III., p. 194. 



