366 DURHAM DIPTERA. 



LI. 637. 



636. Diplotoxa, 637. Chlorops, and 638. Chloropisca, 

 in Verrall's list. Many of the so-called species are probably 

 only varieties, and many have not yet been found in Britain, 

 but I fancy the British list is very incomplete. 



The larvae of many of them live in the stems of grasses, 

 some under bark, or in flower heads. 



1 (53). Dorsum yellow with black, dark grey, or red stripes. 



2 (45). Antennae not wholly yellow. 



3 (38). Antennas at least pale at the base. 



4 (23). Large species, 2^-3 or 5 mm. 



5 (6). Palpi black. Anthracophaga, Lw. (633) 



6 (5). Palpi yellow, sometimes the tip dark. 



6a (6b).Third antennal joint with very long pubescence. 



(dasycera, Lw.) 

 6b (6a). Third antennal joint with the ordinary short 

 pubescence. 



7 (16). Third antennal joint all black. 



8 (11). Legs all yellow, the tarsi often darkened. 

 8a (10a). Sternopleural spot all black. 



9 (10). Central thoracic stripe not abbreviated ; abdomen 



banded; vertical triangle large and broad. 

 Chlorops nasuta, Ztt.=var. of spcciosa, Mg. ? 

 Bedburn, 1 $ and 1 ?, July, 1902. 



10 (9). Central thoracic stripe abbreviated ; abdomen orange 



below, black above; vertical triangle long and 



narrow. {Chloropisca abbreviata, Ztt.=ru/a, Mcq.) 



10a (8a). The sternopleural spot pale, or only black on its 



upper edge. (serena, Lw., and puncticornis, Lw.) 



11 (8). Legs striped or ringed. 



12(15). Fore femora with a stripe on the middle outside; 

 hind tibiae ringed. 



13 (14). Abdomen with four narrow bands. {calceata, Mg.) 



14 (13). Abdomen yellow below, black above. 



2707. Chlorops speciosa, Mg. 



Waskerley, 1 $, July, 1901 ; Harperley, 2 $, June, 

 1900. 



