1 88 DUEHAM DIPTERA. . 



XXVIII. 288. 



8 (7). Antennae black; lunules not reaching the side 



margins. 



9 (10). Abdomen ovate. 



1513-. Syrphus lunulatus, Mg. 

 Hesleden, 1 ?, 16-8-02. 



10 (9). Abdomen narrow. 



10a (10b). Eyes distinctly hairy ; abdominal spots curved. 



(15 14. nigricornis, Verr.) 

 10b (10a). Eyes very slightly hairy ; abdominal spots oblong. 



(1543. lasiophthalmus, Ztt.) 



11 (6). At least two abdominal bands entire. 



12 (13). V.3 2 somewhat looped. 



15 1 5. Syrphus annulipes, Ztt. 

 Harperley, 1 $, June 1st, 1903. 



18 (12). V.3 2 nearly straight ; very like ribesii. 



(15 1 6. torvus, O.-S.) 



14 (1). Eyes bare (slightly hairy in males of 1538 and 1543, 



but if it be a female and the eyes are slightly 

 hairy, then it is in the first section). 



15 (46). Abdomen oval ; sides not parallel. 



16 (45). The third and fourth abdominal segments each with 



a single band or pair of spots. 



17 (44). Abdomen with a pair of basal spots, and at least 



two other bands, or pairs of spots. 



18 (37). At least two abdominal pairs of spots meeting in the 



centre to form a band. 



19 (24). Face with a distinct central black line, more than a 



dark knob. 



20 (21). Antennae orange. 



15 1 7. Syrphus annulatus, Ztt. 

 Harperley, 1 $, June 1st, 1903. 



21 (20). Antennae all black. 



22 (23). Stigma blackish ; thorax almost dull ; legs nearly all 



black. ( I 5 I 8. lineola, Ztt.) 



