50 H. C. EFFLATOUN. 



lighter in colour. Legs with the blackish markings inclined to be 

 less extensive. Squamulse white. 



Length from 12 12 to 14 12 mm. 



This species is liable to great variation both in size and shape 

 of the abdominal markings, and in Europe the female has a well 

 known variety umcolor "in which the abdominal markings entirely 

 disappear." 



/,. pyrastri seems to be extremely rare in Egypt and 1 much 

 suspect its having been imported from Syria, Italy, or Europe, as 

 the only two specimens which have been recorded (and which I 

 have examined) have both been captured in cultivated land where 

 plants and trees have been imported. 



The larva is said to be green with a purplish dorsal stripe 

 and feeds ravenously on Aphids. It was bred from Aphis bras- 

 sica, Aphis prim] and from an Aphis on Centaurea in Europe. 



This species is known to occur in Europe, Canary Islands, Ma- 

 deira, America and Western Asia. 



2. L. ALBOMACULATUS MAC<J (PI. IV. fig 1 & PI. I, fig 11) 



Macq, Dipt. Exot., II. 2. 86. 1. t. XV. f. 0. (Syrphus) (1842); 

 Lw. ; DiDterenf. Siidafr., 1. 303. 8. (Syrphus) (I860); Mik., Wien. 

 Entom. Zeitg, VII. 222. 61 (Catabomba) (1888); Verr., Brit, Fl., 

 VIII., Catal. Syrph., 56. (Catabomba) (1901); Beck, Zeitschr. f. 

 System. Hymen, u. Dipt, VII. 243. Anmer'k. (Catabomba) (1907); 

 Bez, Dipt. Syriaca et ^Egypt, (21). 57. 92. (1909). 



SYNONYMY:— Gamellarii Bond, Ann. Ace. Asp. Nat. Nap, 

 III.157. (Lasiophticus) (1845-46), Dipt. Prodr, II.139~.6. (Lasioph- 

 thicusi (1857) et Annal. Mus. Civ. Genova, IV 295. (Lasiophticus) 

 (1873); Schin, Verb, zool.-bot. Ges. Wien, VII. 339. 8. (Syrphus) 

 (1857), Fauna. Austr, I. 301. 5. (Syrphus) (1862) et Nov. Beise, 

 Dipt, 351. 34. (Syrphus) (1868); Bceder, Wien, Entom. Zeitg, II. 

 94. (Catabomba) (1883); Mix, Wien. Entom. Zeitg, VII. 222. 61. 

 (Catabomba) (1888) et IX. 295. (Catabomba) (1890); A. Costa, 

 Atti. B. Accad. Napoli, (2) V. No. 14, 24. 41. (Syrphus) (1893); 

 Ketel, Programm Pasewalk, 12 Observ. (Syrphus) (1903). 



DIAGNOSIS: — Yellow bands on sides of thorax present; 

 abdominal lunules wide, and those on the second and third segments 

 slightly arched with their inner ends always touching the 

 upper margins. 



