14 



PROCEEDINGS OF THE NATIONAL MUSEUM 



sparsely clothed with fine hairs and sometimes an occasional bristle, 

 none of which, however, is equal in size to those of the frontal row. 

 Thorax black, gray pollinose, usually subshining, the thoracic chaeto- 

 taxy as in frenckii. Scutellum black, gray pollinose, the apex some- 

 times reddish and bearing three pairs of strong and one pair of 

 weaker marginal bristles besides the apical ones which are directed 

 upwardly, being either parallel or cruciate. Abdomen black, gray 

 pollinose, subshining; anal segment concolorous or with a yellowish 

 tint, more pronounced in female. Sides of intermediate segments 

 often reddish. First three segments with only marginal macro- 

 chaetae, the fourth moderately bristly on the apical three-fourths. 



Mid tibiae with one 

 strong and one smaller 

 bristle above it, or rarely 

 with two strong bristles 

 of equal strength, on the 

 outer front side. As in 

 frenchii there are also 

 two hind bristles and a 

 strong inner one present 

 on mid tibiae. Hind 

 tibiae evenly ciliate with 

 one longer bristle. 



Genitalia (figs. 5, 6) 

 much larger than in the 

 typical frenchii. For- 

 ceps viewed from be- 

 hind, at widest part less 

 than one-third their 

 length. Inner forceps fused for about one-half their length and 

 furnished with well-defined keel ; viewed in profile, they are sinuate,^ 

 slender, and terminate in fine points, their length over three-fourths 

 that of the length of the fourth abdominal segment; outer forceps 

 slender, also terminating in fine points. 



Length, 8-11 mm. Medium to large-sized flies decidedly more 

 robust than the typical frenchii and usually attaining the maximum 

 size. 



The puparium appears similar to frenchii; the posterior spiracles 

 are situated about on the longitudinal axis and the arrangement and 

 number of slits apparently vary to a considerable extent. 



Described from 25 speciments of both sexes reared at the Gypsy 

 Moth Laboratory from Anisota senatoria Smith and Abbot, by J. V. 

 Schaffner, jr., and others. The type (G. M. L. 11776 Kl) is from 

 New Brunswick, N. J. ; date of emergence July 18, 1925. The allo- 

 type (G. M. L. 11776 Kl) from New Brunswick, N. J. The para- 



FlGURES 5 AND 6. ACHAETONEDRA ANISOTAEj NEW 



SPECIES, MALE GENITALIA. 5, SIDE VIEW ; 6, FKOM 

 BEHIND 



