﻿CRITICAL NOTES ON DIPTERA. 151 



have a number of specimens taken at Plashett Wood, Sussex, on 

 April 5th, 1870, so labelled, but I have never critically examined 

 the Helomyzidae. Heteromyza atricomis, Mg., does occur in 

 my list, but in a place where nobody would expect it ; the species 

 introduced as Pegomyia rotundicornis, Zett., is really Heteromyza 

 atricomis; I caught the species in abundance near Lairg on 

 June 20th, 1884, but it occurs South, as I had just previously 

 taken it in Sussex, and I think I have it from Devonshire, while 

 Dale's specimens of Pegomyia rotundicornis were from Dorset- 

 shire. I was not sufficiently satisfied with its name to include it 

 in my list. Sapromyza platycephala, Lw. ; as far as I know this 

 species exists only upon two injured specimens described in 1847 

 from Mehadia in Hungary, upon the borders of Eoumania : I should 

 hardly expect this to be common on the windows of a London 

 house in 1889, without having been observed in the intervening 

 42 years. I have been too busy with my own captures this 

 winter to afford time to name many specimens belonging to 

 other people, or else I expect I should have been able to examine 

 some of the specimens ; but even if I had, my critical know- 

 ledge of Sapromyza is insufficient to enable me to speak with 

 confidence. 



Dicranomyia dumetorum, Mg. The common species, London 

 and everywhere else, is D. chorea, Mg. 



Lonchoptera trilineata, Zett. I have several specimens which 

 I believe to be this species, but having never critically examined 

 the genus, I refrained from adding species ; the distinctive 

 characters of the various so-called species are as yet very 

 unsatisfactory. 



Ascia dispar, Mg. This may be a good species, but I cannot 

 yet satisfactorily distinguish it from A.floralis, Mg. 



Microdon devius, L. I have not seen recent specimens of 

 this, but should very much like to do so, as I have seen a 

 beautiful specimen of the other species, M. mutabilis, L., caught 

 last year in Devonshire by Major Yerbury. 



Conops vitellina, Lw. According to a recent comparison 

 made by Mik between this species and C. 4-fasciata, DeG., all 

 our specimens are yellow specimens of the latter ; types that I 

 possess point to the same result. Conops is feminine, and in 

 this genus, as well as in Chrysops, the specific names may well 

 be made feminine. 



Theria muscaria, Mg., was brought forward as British in 

 July, 1888, by Dr. R. H. Meade in time for me to include it in 

 my list (Ent. Mo. Mag. xxv. 27) ; further details were given by 

 Mr. Coryndon Matthews in Ent. Mo. Mag. xxv. 379. 



Cynomyia mortuorum, L., was common at Kannoch in June, 

 1870.' 



Tcpliritis matricarice, Lw. I think it would be better in a 



