-j ( S H. C. EFFLATOUN. 



(Syrphus) (1897); Plateau, Mem. Soc. Zool. France, 1900. 277. (Syr- 

 phus) (1900); Verr., Brit. FI., VIII. 334. l.f. 278-279. (Catabomba) 

 (1901); How., Ins. Book, t. XXI. f. 27. (1902) ; Aldrich, Cat. N.A. 

 Dipt., 363 (1905); Bez., Dipt. Syriaca et ^Fgypt., 93. 57. (1909), 

 Ditt. raccolti d. Leo Fea, (407). 6. 8. (1912) et Syrph. Ethiop. Reg., 

 3. 25., 31. (1915); Beck., Bez., Kert. u. Stein, Kat. Palaearkt. 

 Dipt., 111.55.(1907); Kert., Cat. Dipteror., VII.98.(1910); Osburn., 

 Jonrn. N. Y. Entom. Soc, 58 (1910); Lundb., Dipt, Danica, V. 261. 

 263, f. 116, 117.(1916). 



SYNONY MY :-^af finis Say., Journ. Acad. Philad., III. 93. 9. 

 (Syrphus) (1823) et Compl. Writ., II. 81. (Syrphus) (1859); Wied., 

 Aussereurop, Zweifl., II. 117.2. (Syrphus) (1830). 



mellinusHAMi., Expos. Engl. Ins., 30. t. XXIV. f. 23. (Mwsca) 

 (1776). 



rosce Dec, Ins., VI. 108.5. t. VI. f. 15-19. (Musca) (1776). 



transfugus Fabr., (nee. L), Entom. Syst., IV. 306. 104. (Syr- 

 phus) (1794) et Syst. Antl., 250. 5. (Scceva) (1805); Ketel, Pro- 

 gramme Pasewalk, 9, (Syrphus) (190:;). 



var. flavoscutellatus Girschn., Wien. Entom. Zeitg., Ill 

 197. 11. (Syrphus) (1884). 



var. unicolor Curt., Brit. Entom., 509. (Scceva) (1838); Verr., 

 Entom. Monthly Mag,. V. 21. (Syrphus) (1869). 



1)1 A GNOSIS: — Yellow bands absent on sides of thorax ; abdo- 

 minal lunules more or Less narrow, those on the third and fourth 

 segments much arched, their inner ends very rarely touching the 

 hind margins. 



DESCRIPTION: Male: [lead wider than the thorax and as 

 wide as the widest part of the abdomen. Face greyish-yellow with a 

 na crow brownish middle line which extends to about half way between 

 the mouth and the antenna?, but which is partially continued be- 

 low, round the mouth edge and more widely across to the eyes. 

 Frons so large and inflated that the face actually diminishes in 

 width from the frons all the way down to the mouth. The frons is 

 darker coloured than the face and is densely and conspicuously 

 cloth. d with blackish erect pubescence. Pubescence on the face 

 rather dense and varying from being almost uniformly whitish and 

 iin : nspicuons, to being blackish on the sides and middle, but yel- 

 low between and below. On the jowls, the pubescence is pale, be- 

 coming almosl v hite on the occiput, but yellow again near the up- 

 per part of the occiput, with a few longer, almost black hairs 

 overhanging the eyes. Vertex black with blackish pubescence on 



