THE ALFALFA CATERPILLAR, 



21 



Rockwood at Salt Lake City in the summer of 1913 and has since 

 been determined by Mr. A. B„ Gahan, of this bureau, as Limnerium 

 n. sp. (fig. 8). Mr. Rockwood found these parasites of material ben- 

 efit in the suppression of outbreaks in Utah and always reared them 

 from young and only partially grown larva?. At Salt Lake City, 

 during the summer of 1913^. he also reared a goodly number of a 

 small hymenopteron, Apanteles (Protopanteles) flavicombe Riley. 

 This species is gregarious, but was not found to be sufficiently nu- 

 merous to exert any marked effect upon the abundance of Eurymus. 

 The common C holds ovata Say (fig. 9) was first reared from this 

 species by the writer in 1910, at El Centro. Only one specimen 

 was secured, but in 1912 the author reared many adults, and in 1913 

 the Messrs. Wilson reared adults from pupae collected in both Ari- 

 zona and California. 



Pig. 9. — Chalets ovata, a parasite of the pupa of the alfalfa caterpillar : a, Pupa ; o, para- 

 sitized pupa of tussock moth (Hemerocampa lencostigma) ; c, adult ; d, same in profile ; 

 e, pupal exuvium. Enlarged. (From Howard.) 



PTEROMALTJS EXJRYMI GAHAN. 



The three parasites just mentioned are of minor importance, but 

 the fourth is of great assistance in suppressing outbreaks of the 

 alfalfa caterpillar. It is a new species, recently described by Mr. 

 Gahan 1 as Pteromalus eurymi (fig. 10). Mr. H. T. Osborn, at Wel- 

 lington, Kans., in September, 1910, reared 40 specimens of this spe- 

 cies from a pupa of Eurymus, but the specimens were put into 

 alcohol and not determined until November, 1913. When, therefore, 

 Mr. R. N. Wilson secured a parasitized pupa in December, 1911, and 



1 Gahan, A. B. New Hymenoptera from North America. Proc. U. S. Nat. Mus., v. 46, 

 p. 431-443, 1913. "Pteromalus eurymi, new species," p. 435-436. 



