THE SORGHUM MIDGE. 



45 



Milo maize. In one instance the writer reared a single adult from the 

 common foxtail grass (Setaria glauca) a and Mr. George G. Ainslie has 

 also reared the midge from the grass Sieglingia seslerioides. b 



In the investigation of this problem many varieties of sweet sor- 

 ghum were observed in their relation to infestation, among which 

 are Early Amber, Crookneck, Sappling, Sofohro 7 Durra, Egyptian, 

 African Durra, Red African, and Sumac, and while there is some 

 difference in the degree of infestation of these varieties it has not been 

 observed to be sufficiently great to merit the recommendation of any 



Fig. 24. — The sorghum midge ( Contarinia sorghicola): a, Adult male; b, antenna 

 joints of same; c, head, frontal view, a, Greatly enlarged; b, c, highly mag- 

 nified. (Original.) 



of them as resistant varieties — all being infested to such an extent 

 that they would have failed to produce a profitable crop of seed. 



DESCRIPTIONS. 



THE ADULT. 



The following is the original description of the species by Mr. 

 Coquillett : 



Antennae of the male as long as, of the female almost one-half as long as, the body, 

 in both sexes composed of 14 joints; joints 3 to 14 in the female each slightly con- 

 stricted in the middle, each except the last one greatly constricted at the apex into 



a Baton Rouge, La., September 14, 1908. 



&Clemson, S. C, August 15, August 31, November 3, and September 8, 1908. 



