SEKPHOID AND CHALCIDOID PAEASITES OF THE HESSIAN FLY H 



Platygaster longicaudatus Kieffer, Ann. Soc. Sci. Bruxelles 30: 131, figs. 11 

 and 12, 1906 ; Kieffer, Das Tierreich, v. 48, p. 826, fig. 334, 1926. 



Platygaster brevicaudatus Kieffer, Ann. Soc. Sci. Bruxelles 30: 133, fig. 13, 

 1906. 



Polygnotus sp. Ainslie, Ent. Soc. Wash. Proc. 10: 14, 1908. 



Polygnotus hiemalis Howard and Fiske (not hiemalis Forbes), U.S.Dept.Agr., 

 Bur. Ent. Bui. 91 : 21, 1911. 



Polygnotus vemalis Myers, U.S. Natl. Mus. Proc. 53 : 256, 1917 ; Kieffer, Das 

 Tierreich, v. 48, 756, 1926. 



7 c V%, 



Figure 2. — Platygaster zosine "Walker : A, Adult female ; B, head of female ; C, antenna 

 of female ; I), antenna of male. A, X 35. 



Platygaster vemalis Hill, Ent. Soc. Wash. Proc. 24: [109], 1922; Hill, Jour. 

 Agr. Research 25: 31, 1923; Fouts. U.S. Natl. Mus. Proc. 63: 70, 1924; Leiby 

 and Hill, Jour. Agr. Research 28: 829', 1925; Leiby. Ann. Ent. Soc. Amer. 19: 

 295, 1926 ; Hill, Jour. Agr. Research 32 : 266, 1926 ; Kieffer, Das Tierreich, 1. 48, 

 p. 756, 1926 ; Hill and Smith, Jour. Agr. Research 36 : 153, 1928 ; Hill and Smith, 

 Penn. Dept. Agr. Bui. 12 (12) : 10, 1929. 



DESCRIPTION 



Platygaster zosine can be distinguished from other Platijgasters 

 parasitic on the hessian fly by the distinctly transversely reticulated 

 occiput, vertex, and frons; by the more or less distinct lateral mar- 

 gination of the scutellum; and by the long wings, which are about 

 three times as long as the abdomen, and slightly fuscous. 



Female. — Length 0.7 to 0.9 mm. Head about as wide as the thorax at tegulae, 

 not, or scarcely, twice as broad as long; occiput, vertex, frons, and temples 

 with fine reticulate sculpture which on the vertex and frons usually has the 



