320 



Head as in Figures i and 2, Plate XLVIII, the antenna not over 

 3 times as long as its apical diameter (Fig. 6, a) ; maxillae very com- 

 plex (Fig. 3) in life, moving rapidly and alternately with an upward 

 and downward motion; mandibles weak (Fig. 6). Entire body with 

 rather long weak hairs, a pair on lateral margins, and 6, stronger 

 than the others, in a transverse series on disc of each segment; apical 

 segment about 6 times as long as its basal width, the terminal hairs 

 of moderate length. 



The foregoing description was made from material obtained in 

 the Illinois River and used by Mr. Hart in connection with his paper 

 previously referred to. The species is very common in the Illinois 

 and connected rivers and streams. 



For a more complete description of the external appearance of the 

 larva and details of the life history of the species the reader is re- 

 ferred to Mr. Hart's paper.* 



Stratiomyia meigeni Wiedemann 



Stratiomyia meigeni Wiedemann, Aiissereiir. Zweifl. Ins., Vol. 1, p. 61. (1828) 



Larva. — Length, 25 mm. ; greatest width, 5 mm. Darker than the 

 preceding species, the pale vittae distinct only at posterior margin of 

 each segment. 



Differs from norma in having a number of short, stout processes 

 on anterior margin of dorsum of first segment, and in the length of 

 the apical segment — which is but little more than 3 times as long as 

 its basal width and more gradually tapered than in norma. 



Described from specimens obtained in a small stream at Muncie, 

 111., in April and May, 1916. 



I had many larvae but reared only 2 imagines. The species is 

 very common throughout the state, and the imago has been previously 

 recorded by Mr. Hart, under the name marginalis Loew, from 

 Bureau, Rock Island, McLean, and Champaign counties. It occurs 

 commonly on flowers of wild parsnip in August at White Heath, 

 LTrbana. and Muncie. 



Odontomyia Meigen 



Larva and Pnparinm (PI. XLVII, Figs. 2, 3). — Similar in general 

 appearance to Stratiomyia, but differs in the following particulars : the 

 antennae are longer — about 6 times as long as their apical width ; the 

 apical segment is not more than 3 times as long as its basal width 



*Bull. 111. State Lab. Nat. Hist., Vol. 4, Ait. VI, pp. 248-252. (1895) 



