CODLIjSTG moth IN" CEI^TEAL APPALACHIAIT KEGION. 47 



A dipterous parasite, reared from codling-moth larv^ at Keyser in 

 1911, was determined by Mr. W. R. Walton, of the Bureau of Ento- 

 mology, as {HyiJostena) TacMnopJiyfo variabilis Coq. (PL I, fig. 3). 

 Only a few specimens of this species were obtained. 



HAIRWORM PARASITES.^ 



Hairworm parasites of the codling moth (PL I, figs. 5, 6) were found 

 at Greenwood, Keyser, and French Creek, being abundant in the 

 seeond-brood larvae at the latter place in 1911. These parasites were 

 within the bodies of the codhng-moth larvae at the time collections 



Fig. 23.—ItoplecUs marginalits, a, paiasite of the codling moth. Enlarged. (Original.) 



were made from the bands and usually issued from their hosts 10 days 

 oi' 2 weeks after the larvae were placed in the rearing jars. Occasionally 

 dead lai-vsc, surrounded by a mass of dead hairworms, were found under 

 the bands, and in a few cases the hairworms were found within apples 

 boiTic by the banded trees. It was evident that infestation occurred 

 at an early stage in the larval development and that all infested indi- 

 viduals died as full-grown lai-vae. Most of the parasitized larvae died 

 witliin 10 days aflc^r b(!iiig placed in tlic rearing jars. 



Tho hairworms were from 2^ to 5 inches in longtli, and three or 

 four wero frequently observed to inliabit one larva. In leaving tho 

 host they pa-ssed througli tho anal opening or })roko through tho 



» ifermU sp. Material was referred to Dr. B. H. Ransom, of tho Biaroau of Animal Industry, hut as 

 Iho »|)ccimens wore all immature, thoy eoul<l not lio (lot«!rmin(;d .Hpocilicully. 



