242 DURHAM DIPTERA. 



XXXII. 444. 



3 (2). Thorax with faint whitish lines. 



4 (5). Wings greyish. (1927. serena, Mg.) 



5 (4). Wings quite clear. 



1924. Pyrellia cyanicolor, Ztt. 

 I took two females at Marley Hill in 1896, which I 

 take for this species, but the specific characters in 

 Pyrellia and Lucilia are not satisfactory, and the 

 identifications very uncertain. 



6 (1). Eyes pubescent. 



7 (8). Wings brownish at the base in the male ; squamse 



yellowish. 

 1925. Pyrellia lasiophthalma, Mcq. 

 Bishop Auckland, 6 $ and 4 $ ; Harperley, i $, April, 

 1900-01 ; Marley Hill, 1 ?. 



8 (7). Wings quite clear in the male ; squamae white. 



(1926. eriophthalma, Mcq.) 



446. Protocalliphora, Hough. 



Larvae of this and the next in putrifying animal matter. 



1929. Protocalliphora grcenlandica, Ztt. 



This fly was exceedingly common about Bishop 

 Auckland while a small bone-manure factory was 

 going at South Church. I have seen them clinging 

 to the wall of the Clergy House and to the tomb- 

 stones in the churchyard in solid masses of 

 thousands. Since the factory was closed, they 

 have to a large extent disappeared. It is a shining 

 blackish blue fly, while (1928. azzirea, Fin.) seems 

 to be of a brighter blue or gold green. 



446. Calliphora, Dsv. 



1 (2). Jowls red with black hairs. 



1930. Calliphora erythrocephala, Mg. 

 The commoner bluebottle. Abundant everywhere. 



