DURHAM DIPTERA. 1 87 



XXVIII. 287. 

 287. Catabomba, O.-S. 



1 (2). Abdominal lunules curved upwards from the sides, 



so that their inner ends are nearer the fore margins 

 of the segments than their outer ends. 

 1508. Catabomba pyrastn, L,. 

 Fairly common everywhere. 



2 (1). Abdominal lunules level. 



1509. Catabomba selenitica, Mg. 

 Wearhead, in a fir plantation, 1 9-8-01. I believe 



I saw another at the same place, but failed to 

 catch it. 



288. Syrphus, F. 



1 (14). Eyes distinctly hairy. (Only slightly hairy in 15 16, 



1538, and 1543). 



2 (3). Thorax with two distinct grey lines. 



1 5 10. Syrphus albostriatus, Fin. 



Hesleden, 1 $, 12-8-99, 1 ?> 23-8-99; Gibside, 1 ?, 

 22-8-96; Bishop Auckland, 1 ?, 1 1-7-99. 



3 (2). Thorax not more than indistinctly striped. 



4 (5). Band on the third abdominal segment the broadest. 



15 1 1. Syrphus tricinctus, Fin. 

 Gibside, 1 % 22-8-96; Hesleden, 1 $, 1 ?, 1 1-8-99; 

 Harperley, 1 $, 4-6-00. 



5 (4). Bands on the abdomen about equal. 



6 (11). Bands on the abdomen all broken at the middle. 



7 (8). Antennas partly reddish. 



7a (7b). Abdomen oval. Abdominal lunules extended over 

 the side margins. Scutellum generally yellow 

 haired. 



1512. Syrphus venustus, Mg. 

 Not common in June. 



7b (7a). Abdomen with almost parallel sides. Eyes very 

 slightly hairy. Scutellum black haired. 



(1538. punctulatus, Verr.) 



