I go DUKHAM DIPTERA. 



XXVIII. 288. 



32 (29). Thorax brightly shining. 



33 (34). Scutellar pubescence all yellow. 



1524. Syrphus latifasciatus, Mcq. 

 Wearhead, 3 $, 1 ?, 2 1-8-0 1. 



34 (33). Scutellar pubescence partly black. 



35 (36). Abdominal bands straight, and going almost their 



full width over the side margins. 



(1525. nitidicollis, Mg.) 



36 (35). Abdominal bands undulated, and only reaching the 



side margins at upper corners. (1526. nitens, Ztt.) 



37 (18). Abdominal bands broken at the middle. 



38 (41). V.3 2 somewhat looped. 



39 (40). Hind femora all yellow. Size 10 mm. 



(1527. arcuatus, Fin.) 



40 (39). Hind femora black on the basal half. Size 12 mm. 



(1528. lapponicus, Ztt.) 



41 (38). V.3 2 only gently undulated. 



42 (43). Abdominal spots touching the side margins; scutellum 



yellow haired. 



1529. Syrphus corolla, F. 

 Common everywhere. 



43 (42). Abdominal spots not touching the side margins ; 



scutellum black haired. 



1530. Syrphus luniger, Mg. 

 Common everywhere. 



44 (17). Abdomen with a pair of basal spots and one band. 



1 53 1. Syrphus Mfasciatus, F. 

 Evenwood, 3 $, 5-6-97 ; Bishop Auckland, 3 ?, 

 June, 1897-99. 



45 (16). The bands on the third and fourth segments double, 



a narrow one in front, a broader behind. 

 1532. Syrphus balteatus, Deg. 

 Common everywhere. 



46 (15). Abdomen with almost parallel sides. 



47(48). Abdominal bands duplicated, balteatus, above (1532) 



