1 86 DTJEHAM DIPTERA. 



XXVIII. 281. 



6 (5). Face and frons moderately dusted ; arista slightly 

 pubescent. 



1499. Melanostoma scalare, F. 

 Common everywhere with mellinum. The females of 

 the last two occur in a melanoid form, of which 

 the first and last of the mellinum females in the 

 museum case are examples. 



284. Leucozona, Schin. 

 1502. Leucozona lucorum, L. 

 Gibbsnees, 1 $, 4-8-97; Bishop Auckland, 1 $; 

 Belburn, 2 $, 9-6-98 ; Hesleden, 1 % 20-8-00 ; 

 " Killingworth," C. Robson. 



285. ISCHYROSYRPHUS, Big. 



1 (2). Fore legs all orange except base of femora. Length, 



11 mm. 



1503. Ischyrosyrfihus glatuius, L. 

 It was abundant at Gibside on 12th August, 1896, 

 especially females. Since then I have only come 

 across it now and again at Hesleden and Shipley 

 in July and August. 



2 (1). Fore legs blackish, except the knees. Length, 10 mm. 



(1504. lafemarius, Mull.) 



286. Did^ea, Mcq. 



1 (2) (3). Scutellum almost entirely yellow haired. Abdominal 



yellow bands large and conspicuous, the second 



and third not interrupted. Size 12 mm. 



(1506. fasciata, Mcq.) 



2 (1) (8). Scutellum nearly all black haired. Abdominal 



markings greenish, and all interrupted in the 

 middle except the second in the male. Size 

 12 mm. (^oS- alnett, Fin.) 



3 (1) (2). Scutellum yellow haired on the base, black haired 



on the tip half. Two abdominal bands entire 



and yellow. Rather small size, 10 mm. 



(1507. intermedia, Lw.) 



