DURHAM DIPTERA. 239 



XXXII. 435. 



TABLES OF SPECIES. 



435. Stomoxys, Geoff. 



Larvae in horse dung. 



1905. Stomoxys calcitrans, L. 



A sharp biter, much resembling the harmless house 

 fly, which is therefore often blamed for biting, of 

 which it is incapable. Stomoxys is very common 

 everywhere, especially in the vicinity of stables. 



436. H^ematobia, Dsv. 



1 (2). Dorsum striped ; palpi orange. 



1906. Hcematobia stinmlans, Mg. 

 Hesleden, 1 $, August, 1900; Bishop Auckland, 2 $, 

 June, 1902. 



2 (1). Dorsum almost unstriped; palpi dark. 



(1907. irritam, L.) 



437. POLLENIA, DSV. 



Life history apparently unknown? 



1 (2). Abdomen shining black, without reflections. 



1908. Pollenia vespillo, F. 

 Wearhead, 1 $ and 1 ?, August, 1901. 



2 (1). Abdomen with brown reflections. 



1909. Pollenia rudis, F. 

 Very common everywhere, and one of the earliest 

 flies to appear. 



438. Mysopila, Rnd. 



Life history unknown. 



1910. Mysopila meditabvnda, F. 

 Stanhope, 1 $, Hesleden, 1 $ and 2 ?, April-May, 

 1900. 



