504 JOURNAL OF ECONOMIC ENTOMOLOGY [Vol. 14 



long bristly hairs on the upper (extensor) side of the basal segment of 

 the middle tarsus. For lack of bred material in which both sexes are 

 associated, the female has not yet been sufficiently studied to distinguish 

 it with certainty from that of H. cilicrura. 



As for the larvae, the imported onion maggot, Hylemyia antiqua 

 { = cepetorum) , the seed com maggot, H. cilicrura, the cabbage maggot, 

 H. brassicae, and the seed potato maggot, H. trichodactyla, also resemble 

 each other rather closely. The distinctive features of the first and third, 

 are figured in Bulletin 200, N. J. Agr. Exp. Station, page 7; and the first 

 three are figured by Gibson in Bulletin No. 12, Dept. of Agr., Dominion 

 of Canada, 1916, page 12. The differential characters of the fourth, 

 based on a study of my specimens, are given below. In Hylemyia 

 antiqua and H. cilicrura the ventro-caudal papillae are simple; in H. 

 brassicae and H. trichodactyla the two median ones are bifid. The 

 last named species may further be distinguished from H. brassicae 

 by the more distinctly chitinized condition and yellow color of the bifid 

 papillae, the smaller size, and by the form of the mouth hooks. In H. 

 brassicae the mouth hooks are robust and nearly smooth below; in 

 H. trichodactyla they are smaller, slightly more pointed and slender, 

 and uniformly serrate with about ten small teeth on the concave margin. 



Until more light can be thrown upon the grouping of the closely related 

 genera of the subfamily Anthomyiinae, I prefer to unite under the generic 

 name Hylemyia, the genera Chortophila, ( = Phorbia), Hylemyia sens, 

 str., and the black legged species of Pegomyia. 



It is desirable that economic entomologists who are working upon 

 the habits of the Cabbage, Onion or Seed corn fly, keep in mind Hylemyia 

 trichodactyla, -with, the hope that something more may be learned con- 

 cerning its habits and its relation to farm crops. 



A LAMP FOR TAXONOMIC WORK IN ENTOMOLOGY' 



By W. J. Phillips and F. W. Poos, U. S. Btireau of Entomology, Charlottesville, Va. 



Taxonomic work on the genus Harmolita,oi which many species are 

 differentiated by the sculpturing of the propodia, requires both a magnifi- 

 cation by high powered lenses and a very bright light. For this reason 

 the writers have felt the need of better lighting facilities than those 

 afforded by the common gooseneck type of electric lamp. A number of 

 lamps of different manufacture have been tested. While these lamps 

 gave sufficient light they were not only difficult to adjust but developed 

 a great amount of heat, and were not economical in the use of electrical 



'Published with the permission of the Secretary of Agriculture. 



