*»'r-20 A NEW PARASITIC JXY WEBBER 3 



Wings hyaline ; apical cell open, ending a little w ay before wing 

 tip; first vein bristly from base to a,pex; third vein at base with 

 three bristles, the outermost ones strongest and unusually long ; costal 

 spine appressed. Hind cross vein retracted, the last section of the 

 first vein considerably more than one-half the preceding. 



Female.— Front, at vertex, 0.40 of the head width (measurement 

 of three as follows: 0.39, 0.39, 0.41) ; part of the second and base of 

 third antennal joint reddish yellow; third joint mostly black, five 

 times the length of the second; otherwise, except for the genitalia, 

 like the male. 



Length, 5 to 7 mm. 



The species is represented by large series of both sexes and there 

 appears to be but little variation. Ocassionally the males will show 

 a little red on the first two antennal joints and a few specimens 

 have the frontal vitta a little more yellowish than the parafrontals. 

 As a rule the arista is thickened from one-third to one-half the way 

 from the base and gradually tapers therefrom. Earely is there any 

 abrupt tapering. There are usually two (rareh^ one) midtibial 

 bristles, often three in the females; hind cross vein retracted, but 

 the distance from its end to the small cross vein is variable. The 

 number and position of the geno-orbital bristles vary. Costal spine 

 usually appressed, sometimes upright and distinct. The anal cell 

 open or closed. There is also minor variation in the abdominal 

 macrochaetae. 



Pupariu77i. — The puparium has been described by Greene ^ under 

 the name of Hypocheata longicomis Schiner. 



Biology. — Only a few facts concerning the biology of the species 

 are known. Usually there is a single generation, but occasionally 

 adults will emerge in the late summer of the same year in which the 

 puparia are formed and joossibly a partial second generation ensues. 

 The species passes the winter in an undeveloped state within the 

 puparium. 



Described from 25 specimens of both sexes reared at the gipsy moth 

 laboratory from Cingilia catenaHa Drury, by J. V. Schaflner, jr., and 

 others. The type (G. M. L. 12418 J3a) is from Sherborn, Mass.; 

 emergence date, April 21, 1924. The allotype (G. M. L. 12418J3) 

 from Sherborn, Mass.; emergence date, April 24, 1924. The para- 

 types are as follows : 4 males, Sudbury, Mass., June 2, 4, 4, 4, 1923 

 (G. M. L. 12418 H2) ; 4 males, Sherborn, Mass., June 2, 2, 4, 4, 1923 

 (G. M. L. 12418 HIA) ; 3 males, Brewster, Mass., June 2, 4, 4, 1923 

 (G. M. L. 12418 H3) ; 1 female, Lancaster, Mass., May 20, 1929 (G. 

 M. L. 12418 P 2) ; 2 females, Amherst, N. H., May 16, 17, 1929 (G. M. 



sProe. U. S. Nat. Mus., vol. 60, no. 2405, art. 10, 1921, p. 2S. 



