DURHAM DIPTERA. 201 



XXVIII. 304. 

 304. Merodon, Mg. 



1589. Merodon equestris, F. 

 (a). Thorax grey or tawny in front, black behind; 

 abdomen pale tawny at base, rich tawny 

 behind. (var. eqtiestris, F.) 



(b). All pale haired. 



var. narcissi, F. 

 Bishop Auckland, 2 $ , 4-7-01. 



(c). All pale haired except the third abdominal seg- 

 ment, which is black, (var. transversalis, Mg.) 



(d). All black haired except the end of the abdomen, 

 var. va/idus, Mg. 

 Bishop Auckland, 2 5 , 16-6, 2-7-00. 



307. Criorrhina, Mg. 



1 (2). Large black species, 16 mm., with the end of the 



abdomen reddish or whitish. 



1592. Criorrhina ranunculi, Pz. 

 Mr. C. Robson has taken a single specimen at 

 Winlaton. 



2 (1). Pale species, n-i4mm. 



8 (4). Scutellum black haired. ( T 593' berberina, F.) 



4 (3). Scutellum tawny haired. 



5 (8). Abdomen roundish or oval without any pale bands ; 



fore and mid tibiae usually blackish. 



6 (7). Abdomen entirely covered with nearly equal dense 



tawny pubescence, which is paler along the hind 

 margins of the segments. (1594. oxyacanthce, Mg.) 



7 (6). Abdomen with a tuft of long pale hairs at each basal 



corner, but otherwise clothed with short tawny 

 pubescence, which allows the dull black ground 

 colour to be clearly visible. 



1595. Criorrh in a fioccosa, M g. 

 Bishop Auckland, 1 $, 14-6-99, 1 $, 10-6-01. 



8 (5). Abdomen narrowish, black, with inconspicuous 



yellow bands ; fore and mid tibiae yellowish. 



(1596. asilica, Fin.) 



