DURHAM DIPTERA. 24 1 



XXXII. 441. 



4 (5). Abdomen with brown reflections. 



19 1 6. Cyrtoneura fiabulorum, Fin. 

 Wearhead, 1 $, August, 1901. 



5 (4). Abdomen blue-black with white shimmer, but no 



brown reflections. ( I 9 I 7« pascuorum, Mg.) 



6 (8). V.4. almost straight, only a little bent towards the 



end; palpi black. (1918. ccesia, Mg.) 



443. Morellia, Dsv. 



1 (2). Male mid tibiae very short and evenly haired on the 



upper side. 



19 1 9. Morellia simplex, Lw. 

 Common everywhere. 



2 (1). Male mid tibiae with hairs of unequal length, and 



peculiarly arranged on the upper side. 



3 (4). Male hind tibiae only slightly bent, and with a row of 



eight to ten bristles on the inner side. 

 1920. Morellia hortorum, Fin. 

 Hesleden, 3 $ and 2 ?, Wearhead, 1 ?, July-August, 

 1899-1901. 



4 (3). Male hind tibiae much bent, and bearing only two 



bristles. (1921. curvipes, Mcq.) 



443. Mesembrina, Mg. 



Larvae in cow-dung. 



1922. Mesembrina meridiana, L. 

 Common throughout the summer. It is often to 

 be seen sitting on footpaths, flying off as one 

 approaches, and alighting a few yards further on. 



444. Pyrellia, Dsv. 

 Larvae in putrifying animal matter. 



1 (6). Eyes bare. 



2 (3). Thorax metallic green, without the faintest trace of 



white dusting. ( T 9 2 3- cadaverina, L.) 



p 



