554 LIST OF DIPTERA. 



Xylota nigra, Fabr. Syst. Antl. 192, 16. Latr. Gen. Crust iv. 



331. Fall. Syrph. 11, 7. Meig. Dipt. iii. 221, 14. Macq. 



Hist. Nat. Dipt. i. 522, 7. Syrphus niger, Fabr. Ent Syst. iv. 



295,63. 

 a. ? 



Xylota abiens, Wied. Meig. Dipt. iii. 218, 9. 

 a. ? 



Xylota bifasciata, Meig. Dipt iii. 219, 10. Zett Ins. Lapp. 585, 

 2. Curt. Brit Ent. 425. 



Xylota Dascon, n. s., mas. et fem. JEneus, abdomine fulvo qua- 

 drimaculato, capite abdomineque postico chalybeis, ventre, an- 

 tennis pedibusque fulvis, tibiis tarsisque anterioribus flams, 

 pedibus posticis ferrugineis 9 alis limpidis. 



Head steel blue, clothed behind with tawny hairs, covered 

 in front with whitish down : mouth pitchy : eyes red ; facets rather 

 large in front: feelers tawny: chest and breast coppery, thinly 

 clothed with short tawny hairs : abdomen coppery, clothed with short 

 whitish hairs, steel blue towards the tip and sometimes on each 

 side, adorned with two large square tawny spots on each side ; un- 

 derside tawny : legs tawny ; four front shanks and feet yellow, tips 

 of the latter tawny ; hind legs ferruginous, their thighs with a cop- 

 pery tinge, their shanks tawny at the base : wings colourless ; w r ing- 

 ribs and poisers taway ; veins pitchy, tawny towards the base. 

 Length of the body 4 lines ; of the wings 8 lines. 



Nearly allied to X. bifasciata, but the cross-veins are more 

 upright. 

 a ? 





Xylota Baton, n. s., fem. JEnea, abdominis segmento secundo ful 

 vo bimaculato, antennis piceis, pedibus aneis, tibiis tarsisque an- 

 terioribus fulvis, tibiis posticis nigris, tarsis posticis piceis, alis 

 subcinereis. 



X. ejuncida? Say, Amer. Ent. pi. 8. Wied. Auss. Zweif. ii. 

 100, 5. X. quadrata? Say, Amer. Ent. pi. 8. Wied. Auss. 

 Zweif. ii. 101, 6. X. metallica ? Wied. Auss. Zweif ii. 

 102, 8. 



Body brassy, thinly clothed with short pale hairs : head full as 

 broad as the chest, covered with hoary bloom, clothed behind and 

 beneath with short white hairs : eyes dark red ; facets small : mouth 

 and feelers piceous: second segment of the abdomen adorned with a 



