in the Collection of W. W. Saunders, Esq. 291 



side between the eyes ; underside testaceous ; thorax in front 

 with three testaceous stripes, and on each side with a transverse 

 testaceous line which joins the lateral stripe ; hind part of the 

 thorax with a stripe on each side and the border of the scutellunri 

 testaceous ; hind borders of the abdominal segments testaceous ; 

 base testaceous, including a transverse brown spot ; wings limpid, 

 vi'ith a brown front stripe, which is sub-costal for more than half 

 the length, costal from thence almost to the tips. 



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



Amazon Region. 



Eristalis involoens. 



Fcem. — Niger, nitens, thorace cinereo obscure vittis quatuor 

 nigris, alis cinereis striga transvevsd medi^ nigrd, alulis 

 sordide albidis margine obscuriore. 



Female. — Cinereous, dull : head, antennae, scutellum, abdomen 

 and legs black, shining ; thorax with four black stripes, the in- 

 terior stripes more slender than the outer and united hindward ; 

 wings grey, with a black streak in the middle across the fore half; 

 veins black ; alulae dingy whitish, with darker borders. 



Length of the body 3| lines ; of the wings 8 lines. 



Genus Xylota, Meig. 



Xylota subcostalis. 



Fcem. — Nigra, nitens, capite pectoreque cinereis, thorace vittis 

 quatuor cinereis, pilis lateralibus sub-auratis, abdomine lan- 

 ceolato, genubus ferrugineis, femoribus posticis crassis, tibiis 

 posticis arcuatis, alis sub-cinereis vitta antica nigrd, halteribus 

 albidis. 



Female. — Black, shining : head with cinereous tomentum on 

 each side in front; antennae seated on a tubercle; third joint 

 elongate-conical, as long as the first and the second together ; 

 thorax with four cinereous stripes, and on each side with slightly 

 gilded hairs ; pectus cinereous ; abdomen lanceolate ; knees fer- 

 ruginous ; hind femora thick ; hind tibiae curved ; wings greyish, 

 with a black stripe which is sub-costal for full half the length, 

 and costal from thence nearly to the tip ; veins black ; halteres 

 whitish. 



Length of the body 5 lines ; of the wings 8 lines. 



Mexico. 



