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PROCEEDIISrGS OF THE NATIONAL MUSEUM 



VOL. 78 



short keel; viewed in profile, strongly convex on their outer edge 

 and terminating in blunt points, their length equal to, or slightly 

 more than one-half the length of the fourth abdominal segment; 

 outer forceps broad, terminating in blunt rounded points. 



Length, 9-11 mm. 



The species is readily distinguished from all others of the genus 

 by its puparium (fig. 13) which always has the posterior spiracles 

 situated some distance above the longitudinal axis. It is further 

 characterized by distinct biological traits. There is but a single 

 generation, the host larvae being attacked in the early stages, the 

 maggot hibernating in the first or second stage and completing its 







Figures 3 and 4. — Achaetonedra ecchaetiae^ new species, 

 male genitalia. 3, from behind ; 4, side view 



development in midsummer. Rarely is there more than one parasite 

 to each individual host. 



Described from 25 specimens of both sexes reared at the Gipsy Moth 

 Laboratory, from Euchaetias egle Drury, by J. V. Shaffner, jr., and 

 others. The type (G. M. L. 12130 M9) is from Redwood, N. Y.; 

 emergence date, July 18, 1927. The allotype (G. M. L. 12130 K5) , 

 from Hingham, Mass. The paratypes are as follows : 2 males, New- 

 burgh, N. Y., May 26-29, 1924 {G. M. L. 12130 J8) ; 1 female, Sara- 

 toga Springs, N. Y., June 6, 1924 (G. M. L. 12130 J13) ; 1 male and 



1 female, Crownpoint, N. Y., May 5-17, 1924 (G. M. L. 12130 J15) ; 



2 males. Natural Bridge, N. Y., July 19, 1927 (G. M. L. 12130 MS) ; 



3 males and 1 female, Hingham, Mass., July 8-9, 15-24, 1925 (G. M. 

 L. 12130 K5) ; 1 male, Bernardsville, N. J., August 1, 1927 (G. M. L. 

 11741 M17) ; 2 males, North Branch, N. J., July 21-27, 1927 (G. M. 

 L. 11741 M9) ; 1 female. North Branch, N. J., August 4, 1927 (G. M. 

 L. 11741 M7) ; 1 male, Somerville, N. J., July 18, 1927 (G. M. L. 



