54 [August, 



HTLEMYIA, B. Desv. 



H. COARCTATA, Fall. 



The larvse of this species have been found in the stalks of wheat, upon which 

 they feed, often doing great damage to the crops. In May, 1882, I bred several of 

 these flies from young wheat plants (infested by little maggots) which were sent to 

 me by Mr. Creese, of Teddington, near Tewkesbury, at the request of Miss Ormerod. 



CHORTOPHILA, Macq. 



C. STLVESTRIS, Fall. 



This large species has been recorded as British by Mr. Verrall, in his " Hundred 

 new British species of Dipfera." It is a mountain species which he captured in 

 Scotland, closely resembling Hydrophoria conica in shape, size, colour, and markings ; 

 it may, however, easily be distinguished from it by the scales of the alulets being 

 much smaller and equal in size, by the arista being pubescent instead of plumose, 

 and by the eyes being approximate in both sexes, instead of being contiguous in the 

 males and widely separated in the females, as in H. conica. As I before mentioned 

 in my list, Schiner placed this species, together with C. Billbergi, in the genus 

 Eriphia, Mgn. 



C TRAPEZINA, Zett. 



Mr. Verrall, in his " Hundred new species," has recorded the capture of A. 

 (PAorJi'a) s^'io^ada, Fall., and remarks that it is the same as the fly that I had 

 named C. trapezina, Zett. It is exceedingly difficult to determine the identity of 

 many species that have been only shortly and insufficiently described, and I allow 

 that my specimens do not coi-respond exactly with some that I have received from 

 the continent under the name of C. trapezina, the central mai-ks on the back of the 

 abdomen being larger and more quadrate in the continental specimens than in the 

 English ones, where they are triangular in form ; still I cannot make them agree with 

 the descriptions given of P. striolata, Fall., of which Zetterstedt says, " Valde similis 

 A. radicum,"* in which the abdomen is marked by strong transverse black lines in 

 addition to the longitudinal dorsal stripe. 



C. CINEEEA, Fall. 



In my notes on this fly I find that I have mixed up the male and female of two 

 distinct species. The one that I took for the male of C. cinerea being really that of 

 P. cepetorum. I discovered my error by breeding a number of both males and 

 females of the latter species from onions, when I found that the male flies were 

 identical with those that I had named C. cinerea, while the females were quite 

 distinct. In colour, markings, &c., the two species are very similar, but the females 

 of C cinerea are larger than those of P. cepetorum, and differ as well by the 

 following points of structure. The arista in C. cinerea is distinctly pubescent 



* Zett., Dipt. Scand., torn, xiv, fol. 6242. 



