172 



Journal of Agricultural Research 



Vol. XVI, No. 6 



plants which have become infested by Bmchophagus funehris. Appar- 

 ently there are at least two generations in a single season. 



The specimens reared showed a much larger percentage of males than 

 of females. 



TIMEROMICRUS MACULATUS GAHAN 



Trimeromicrus mactdatus (PI. 23, A) belongs in the hymenopterous 

 superfamily Chalcidoidea, family Pteromalidae, and subfamily Ptero- 

 malinae. Specimens reared by the writer were determined by Mr. A. B. 

 Gahan of the Bureau of Entomology as belonging to a new genus. The 

 genus Trimeromicrus was therefore erected by Mr. Gahan ^ for this species. 



This species was first reared by the writer from alfalfa seeds infested 

 by Brtichophagus funehris and taken at Yuma, Arizona, in September, 

 1 91 2. Larvae of this species were later dissected from alfalfa seeds where 

 they were found to be parasitic upon the larvae of B. funehris. It was 

 later reared from the following localities : 



El Centre, Cal., September, 1912. 

 Glen dale, Cal., September, 1912. 

 Chino, Cal., November, 1912. 

 Corcoran, Cal., July, 1913. 



Tulare, Cal., Jime, 1914. 

 Red Bluff, Cal., September, 1914. 

 San Diego, Cal., August, 1915. 

 Susanville, Cal., September, 1917. 



Examination of the undetermined collections and the field notes made 

 by different members of the Bureau of Entomology showed that this 

 species was also reared from infested alfalfa seeds as follows : 



Tempe, Ariz., July, 1911, E. G. Sm3rth. 

 Buckeye, Ariz., July, 1912, R. N. Wilson. 

 Newell, S. Dak., August, 1913, C. N. 



Ainslie. 

 Salt Lake City, Utah, September, 1915, 



T. R. Chamberlin. 



Mesilla Park, N. Mex., June, 1909, C. N. 

 Ainslie. 



Sacaton, Ariz., June, 1909, C. N. Ainslie. 



Casa Grande, Ariz., June, 1910, V. L. 

 Wildermuth. 



Wellington, Kans., August, 1910, E. G. 

 Kelly. 



Brawley, Cal., March, 1911, V. E. Wilder- 

 muth. 



Trimeromicrus maculatus was described as a new species by Mr. A. B. 

 Gahan ^ from the specimens reared by the writer from Bruchophagus 

 funehris infesting alfalfa seeds at Yuma, Arizona. 



HIBERNATION 



This species, like the others mentioned, hibernates in the larva stage 

 within the infested alfalfa seeds. It frequently hibernates as early as 

 September. In early spring the larvae change to pupae, remain so for 

 about 30 days, and the adults emerge from the seeds by the time the new 

 seed pods are forming. 



1 Gahan, A. B. descriptions of new genera and species with notes of parasitic hymenoptera. 

 In Proc. U. S. Nat. Mus., v. 48, p. iss-168. Dec. 16, 1914. p. 161: Trimeroinicrus, new genus. 

 ' Op. cit., 1914, p. 162. 



