REPORT OF THE STATE ENTOMOLOGIST IOI4 



283 



contained pupae, the adults issuing therefrom May 19th. This 

 species appears to have been reared in February 1890 at the then 

 Division of Entomology, Washington, D. C, from galls received 

 from O. S. Westcott, Maywood, 111., and apparently the same species 

 was reared by L. H. Weld, April 27, 1908, at Evanston, 111. Polyg- 

 notus and Eurytoma species were reared from shoots infested by the 

 larvae of this midge and those of Rhabdophaga podagrac 

 Felt. 



The gall is a slight, irregular swelling occurring on small twigs* 

 with a diameter of only about 2 mm and also on twigs having a 

 diameter of 1 cm. The galls may be uni- or multilocular, the indi- 

 vidual larvae excavating slender, subcortical channels some 7 mm or 

 more in length. 



Larva. Length 4 mm, stout, deep orange. Head small, obtusely 

 triangular, the antennae long, obtusely conical; breastbone (Fig. 94) 

 large, stout, heavily chitinized, tridentate; the submedian teeth 

 large, obtusely rounded; the median tooth shorter, narrowly rounded; 

 anterior angles of the breastbone greatly produced, heavily chitinized 



vfM 



x. 



m 



& 



ti 



x ■■■.■J 



Fig. 94 Sackenomyia packardi; ventral view of larval head and 



breastbone, enlarged (original) 



