MR. UAKDY ON THE TURNIP-FLT. 361 



pupa state about 21 days. It belongs to the genus Drosophila as 

 at present constituted, which includes the well-known Cellar- 

 fly, Musca ceUaris of Linnceus, whose larva occurs in wine- 

 casks and neglected paste ; and other species whose larvoe are 

 considered, and have in some instances been proved, to be either 

 fungivorous or saprophagous. From the difference in habit, as 

 well as an accompanying modification in character, I propose 

 detaching it along with D. praminum, to which it is closely 

 allied, from its present connection, and constituting a new 

 genus to receive them. Its characters are the following : — 



ScAPTOMYZA,* Hardy MtSJS. 



Antennae with the third joint parallelogrammic, with its 

 tip rounded (Ungulate) ; seta with a few long hairs, mostly on 

 the upper side ; face somewhat slanted, keel moderate ; bris- 

 tles of the mouth-rim rather scant and short ; apex of the 

 trunk dilated, palpi narrowish ovate, or sub-elliptical ; head 

 sub-triangulate, behind moderately transverse, sides obliquely 

 sloped so as to narrow it anteriorly, which contraction slightly 

 affects the fore part of the frontal band ; front sparingly 

 bristly ; eyes sub-oval, finely downy ; body elongate and nar- 

 rowish ; thorax somewhat longer than broad, subparallelo- 

 grammic, faintly glossy, the colouring striped ; abdomen long- 

 ish, narrowish, subconical; its tip in the female slightly com- 

 pressed, oblique, with shining serrated plates beneath ; wings 

 nearly as in Drosophila, but not so broad ; larva living as a 

 miner on the parenchyma of leaves. 



The species are : — 



1. S. GRAMINUM. Drosophila graminum. Fallen, Geomyz. 

 8, 11. Meigen, Zweif Ins. vi. 86. Macquart, Dipt. (Suites 

 k Buffon) il 550. 



" Thorace cinereo fusco-vittato ; abdomine nigro ; anten- 

 nis pedibusque flavis." Long. corj). lin. 1. Meig. 



The larva is subcutaneous in the leaves of the common 

 Chickweed ( Stellarla media), of the Corn Cockle (Lychnis 

 githago), of Chenopodium album, and of Viscaria oculata, and 

 Silene armeria in gardens. Its operations are marked by a 

 large shapeless blotch, with smaller winding galleries conduct- 

 ing to it 



* ZjcKTTfiy, to dig, to fooop out 



