UNDESCRIBED SPECIES OF MUSCIDjE. 149 



that the larvos feed among the decayed mortar. I have found 

 it in Dublin, but always in winter, and have received English 

 specimens from my friends, Mr. Curtis and Mr. F. Walker. 

 Teichomysa can only be considered as a section of the genus 

 Ephydra, Fallen. 



Herbina suiUioidea (Rob. D. p. 698, No. I.) is the insect 

 which I referred to in Vol. I. of this Magazine, as perhaps a 

 variety of Helomyza ustulata, from which I believe it is quite 

 distinct. It occurs, but rarely, in Ireland and the Western 

 Isles, in the same situations with Helomyza tigrina, from 

 which, at first sight, it differs only by the more hoary tinge 

 and generally inferior size. When examined with a lens, the 

 pubescent arista at once discriminates the species. 



2. Characters of some undcscribed Species of the Family 

 Muscidce. 



I. Calypterati, R. D. 



Trib.— Muscidce, R. D. 



Gen. — Musca, Meig. 



Subgen. — Morellia, R. D. 



Sp. 1. M. M. hortorum. Calyptris infumatis. 

 Musca hortorum, Fall. Muse. 52, No. 33. 



In the male, the fore and middle shanks are nearly naked : the fore- 

 thighs ciliate beneath : the hind-shanks scarcely curved, having a 

 few long hairs on the inside, below the middle. 



Sp. 2. M. M. importuna. Calyptris albis. 



Morellia agilis, Rob. D. 405, No. I. ? 



In the male, the fore-thighs are thickly bearded below : the fore- 

 shanks clothed with short thick hair on the inside, and tufted 

 with long hairs behind, from the middle downwards. The middle- 

 thighs have a larger tuft at the tip, and the shanks are thicker, 

 with the down on the outside standing up. The hind-shanks 



c Suillia communis of Rob. Desvoidy, but not Musca suilla, F., which seems 

 rather to be identical with Helomyza nemorum. 

 NO. IT. VOL. IV. X 



