12 



America represented bj- PoJygnotus hiemalu Forbes (tig. 11), per- 

 haps the most useful of any in this countr}'. It is ver}- minute, and 



Mr. Reeves has count- 

 ed over forty of the 

 larvaa within a single 

 Haxseed. It is black, 

 with 3'ellow feet, and 

 the legs are dark 

 brown, banded with 

 yellow. The writer 

 has again and again 

 reared this in great 

 numbers from fall 

 wheat infested by the 

 fly and witnessed the 

 sudden check sus- 

 tained by the pest the 

 following spring. It 



Fig. 11. — Poli/rjnot)if hicmalis, much enlarged (original). 



is owing to this more than to any other influence that the Hessian fl}- 

 is now being held in check in the 

 spring wheat regions of the North- 

 west. Perhaps the next most useful 

 parasite is Efipelnm.^ ally nit French 



(flgs. 12, male, and 13, female). This 

 is generally disti'ibuted over the 

 countr}^ and afiects both the Hessian 

 fl}^ and the joint-worm. It is larger 

 than the preceding; the body is black, 

 with a greenish luster, and the legs 

 are more or less yellow. Merisus 

 de.sfructor Say (fig. 14) occurs in 

 Europe, England, and America, })ut ^'"^- ^''--Eupdnms aimmi.- Male, much en- 



, . 1 !• • .,1 larged (frtmi Rilev). 



not in such profusion with us as to 



attord the same relief to the farmer as in the case of the two preceding. 



It also is black, but with a bluish 

 green metallic reflection, and the 

 legs are black, banded with yel- 

 low. Pfati/gaster IierrlcJi/ / Pack, 

 (fig. 15) is very minute, shining 

 black in color, and is sup})osed 

 l>y many to attack the <^^^ of the 

 fiy, but there is stdl some doubt 

 regarding this. Bwofontas sub- 



much enlarged aj)f<'rU)< RilcV (fig. 10), aS the 



name implies, hus aborted wings 

 in some individuals, while others an^ Fully winged. The head and 

 thorax are of a dark greenish metallic luster, and the legs iionev- 



aO 



Fig. IZ.—Eupelmux nUi/nii: Femak 

 (from Kiley). 



