SERPHOID AND CHALCIDOID PARASITES OF THE HESSIAN PLY 15 



Hill, Ent. Soc. Wash. Proc. 24 : 110, 1922 ; McCollocli, Kans. Agr. Expt. Sta. Tech. 

 Bui. 11 : 63, 72, 1923 ; Fouts, U.S. Natl. Mus. Proc. 63 (art. 15) : 26, 47, 1924 ; Hill 

 and Smith, Jour. Agr. Research 36 : 151, 1928. 



Platygaster error (?) Packard, Rpt. U.S. Ent. Comm., Bui. 4: 20, 1880; U.S. 

 Ent. Comm. Rpt. 3 : 219, 1883. 



DESCRIPTION 



Platygaster herrickii is distinguished from hiemalis and zosine by 

 its distinct and complete parapsidal grooves as well as by its larger 

 size and different sculpture. It differs from P. error by having the 

 temples less receding, the head and thorax finely reticulately sculp- 

 tured instead of polished, and the scutellum more convex. 



Figure 3. — Platygaster Ti&rrickU Packard : A, Adult female 

 G, antenna of male. A, X 25. 



B, antenna of female ; 



Female. — Length 1.5 to 2.2 mm. Head viewed from above transverse, about 

 twice as broad as long, as broad as the thorax ; temples nearly as broad as the 

 eyes, not receding from the eye margins but broadly rounded ; occiput not con- 

 cave, delicately margined ; head in front view a little broader than high, sub- 

 circular ; malar space short, not equal to more than one fourth the eye height ; 

 ocelli in a very obtuse triangle, the lateral ocellus about twice its own diameter 

 from the eye margin ; head finely reticulately sculptured, this sculpture strongest 

 on vertex and temples ; upper part of frons usually weakly sculptured and 

 shining, the lower part with distinct transverse rugulae; cheeks, mandibles, 

 and the oral region with sparse hairs, rest of the head bare or practically bo. 

 Antennae 10-jointed, inserted at the clypeus ; scape extending distinctly above 

 the vertex ; pedicel about as long as the two following joints, two and one half 

 times as long as broad ; flagellum not twice as long as scape and not dis- 

 tinctly clavate; first flagellar joint small, pyriform, usually about as long as 



