XA.yTIIOGRAM.MA. 37 



3 (6) Middle yellow bands on the abdomen entire, 



the first alo;ie being sometimes inter- 

 rupted. 



4 (5) Face with a black median stripe or at least 



darkened in the middle on the tubercle ; 

 a black supra-antennal spot also usually 

 present ; first yellow abdominal band 

 broadly interrupted rotundicorne, Loew.* 



5 (4) Face wholly yellow, not even darkened in 



the middle; snpra-antennal spot want- 

 ing ; first abdominal band never inter- 

 rupted, at the most constricted towards 

 the middle pfeifferi, Big 1 . 



6 (3) Abdomen with four pairs of broad yellow 



rounded spots calopus, Loew. 



31. Xanthogramma aegyptium, Wiedemann (1830). 



A very distinct species on account of the elongate third antennal 

 joint and incomplete yellow notopleural stripe, and, in the male sex, 

 the peculiar form of the front claws and hind trochanters. 



In my recent paper on the Syrphidae collected by Fea (1912), 

 I have stilted that this species is distinct from the Oriental scu- 

 tellare, Fabr. (1805). This last, common throughout the Oriental 

 Region and described from the Island of Formosa as Ischiodon 

 trocha nt erica by Prof. Sack (1913), is distinguished from the 

 present species in hiving the spine of the hind trochanters much 

 thicker and proportionally shorter, the inner front claw simple, the 

 scutellum more darkened, and the first yellow abdominal band of 

 the female always intermitted in the middle. 



The following mines are synonyms of eegyptium : IracJiy- 

 ptemm, Thomson (1869), felix, Walker (1852), fuscotibiale, 

 Macqiiart (1842), longicorne, Macquart (1842), and nafalense, 

 Mat-quart (1846) ; further, Syrpku* senegale nsis of Guerin-Mene- 

 ville (1835) seems to be only the form of the present species in 

 which the abdomen is entirely yellow in its apical half. 



The species is common throughout the Ethiopian Region. 

 There are many specimens of both sexes from Northern and 

 Southern Nigeria : Baro, x. 1910 (Dr. A. Ingram) ; Zungeru, 

 xi. 1910 (Dr. J. W. S. Macfie) ; Zungeru and Aba, ix. 1910 

 ( J. J. Simpson) ; Agege, iv. 1911 (Dr. A. Council) ; Ikom, i. 1912 

 (E. Dai/reU). There are also specimens from British East Africa, 

 Isiola R. (E. J. StortJy), and from Salisbury, S. Rhodesia (Gr. A. 

 K. Marshall). 



32. Xanthogramma pfeifferi, Bigot (1884). 



Nearly allied to -rotund iconic, but easily recognised by the wholly 

 yellow irons and face, and by the entire first yellow abdominal 

 band. 



* Not in the collection ; included for comparison. 



