296 LIST OE DlPTEKA. 



Usia atrata, Meig. Dipt. ii. 227, 3. Macq. Hist. Nat. Dipt. i. 384, 5. 



Volucella atrata, Fabr. Ent. Syst. Supp. 570. Syst. Anil. 114, 



2. Meig. Klass. Zweif. i. 195, a. 

 a. Sicily. 



Ploas, Fabricius. 



Ploas virescens, Fabr. Syst. And. 136, 1. Latr. Hist. Nat. Cr< 

 et Ins. xiv. 300. Gen. Crust, iv. 312, pi. 15, /. 7. Cons. Gen. 

 443. Lam. Anim. sans Vert. iii. 408, 1. Meig. Dipt. ii. 231, 1, 

 pi. 19, /. 6. Mac?, ffirf. Ata. Z>*>*. i. 385, 1, pi. 9,/. 13. Bom- 

 bylius virescens, Fabr. Ent. Syst. iv. 413, 18. Gmel. Ed. Syst. 

 Nat. v. 2903, 12. Meig. Klass. Zweif.pl. 10,/. 17, 190, k. B. 

 maurus, Mikan, Monogr. 56, 13, pi. 4, /. 13. Conophorus 

 maurus, Meig. Klass. Zweif. i. 191, 1. 



a. France. 



Ploas grisea, Meig. Dipt. ii. 232, 2. Macq. Hist. Nat. Dipt. 

 i. 385, 2. Bombylius griseus, Fabr. Ent. Syst. iv. 413, 16. 

 Syst. Antl. 135, 29. Meig. Klass. Zweif. i. 190, 1. 



a. South of France. Presented by F. Walker, Esq. 



b. Paris. Presented by F. Walker, Esq. 



Cyllenia, Latreille. 



A. Three submarginal areolets. 



B. Two submarginal areolets. 



Cyllenia iEgiale, n. s., mas. et fem. Nigra, pilis canis vestita, ca- 

 pite albo, abdomine piceo, antennis nigris, pedibus nigro-piceis 9 

 alis subcinereis fusco maculatis. 



Body black, thickly clothed with hoary hairs : head a little 

 narrower than the chest, white behind and beneath, and thickly 

 clothed with white hairs; clypeus and sides of the crown co- 

 vered with black hairs : eyes dark red : lip black, hairy, as long as 

 the chest; palpi long, black, hairy, nearly half the length of the 

 lip : abdomen linear, piceous, a little narrower than the chest, and 

 rather less than half its length, paler and with a ferruginous tinge 

 beneath : feelers black, hairy : legs black, beset with short black 

 bristles ; hips and thighs piceous, and covered with white hairs : 

 wings slightly gray ; the fore borders brown for three-fourths of the 

 length ; six small brown spots on the disk clouding the cross- veins ; 

 wing-ribs and veins piceous, the latter black towards the tips ; poi- 



