56 H. C. EFFLATOUN. 



sometimes occur in great swarms amongst which be mentions S. 

 corollœ, Las'wyhthicus pyrastri and S. balteatus ; they "appeared 

 to liave ail hatched simultaneously, and to bave at once commenc- 

 ed buzzing about in the sunshine in a foolish kind of way, without 

 caring to take food, for most of them seemed to be mère shells 

 without any substance insidc"; the date of the occurrence of the 

 two and only swarms is August 24th. This genus is one of the 

 largest in the family and now ineludes about 350 species recorded 

 from pi'actically every part of the world. 



TABLE OF EGYPriAN SPECIES. 



1 (2) Length of abdomen less than twice its breadth ; 



abdominal spots very conspicuous, rather lunul- 

 ate and extend over the side margins (PI. IV, 

 figs. 2, 3) 1 ccrollae Fabr. 



2 (1) Length of abdomen more than twice its 



breadth; abdominal spots do not reach the 

 side margins. 



3 (4) Abdominal bandsduplicatcd (PI. IV, fig.O) 2 balteatus Deg. 



4 (3) Abdominal bands very emarginate, or separat- 



ed into triangular spots, (PI. IV, iig. 1). . 3 auricollis Meig. 



1. S. COROLLAE FABR. (PI. IV. figs. 2, 3). 



Farr., Rntom. Svst., IV. 30G.10a. (1794) et Syst. Antl., 250.8. 

 (Scœva). (1805); Meig., Syst. lieschreib., III. 304.40. (1882) ; Macq., 

 liée. Soc. Sci. Lille, 1828.239.23.(1829) Suit, à Buff., 1.539.18. 

 (1834), (in Webb et Berth.) : Hist. Nat. d'Iles Canar., Entom., 

 Dipt., 109.49. (1838) et Explor. Scient. Algérie, Zool., III.469.170. 

 (1849); WiED., Aussereurop. Zweifl. IL 121.7. (1830); Brullé, 

 Expéd. Scient, de Moréc, III. 1., 310.0()9. (1832); Lw. Verh. zool.- 

 bot. Ver. Wien., VIL 80.32. (1857), l'rogramm. Posen, 1840.34.4 

 (1840) et Isis, 1840. VIII. 572.4. (1840); Zett., Ins. Lappon., Dipt., 

 602.16. (Scœva) (1838), Dipt. Scand., IL 720.23. (Scœva) (1843). 

 Dipt. Scand., VIII. 3138.23. (Scœva) (1849) et XII. 4657.23. 

 (Scœva) (1855); Walk., List Dipt. Brit. Mus., III. 583. (1849) et 

 Ins. Britann., Dipt., I. 289. 9. (1851); Schin., Verh. zool. -bot. 



