LIST OF DIPTERA. 655 



vered with pale tawny down ; feet black : wings slightly gray ; 

 wing-ribs pitchy ; veins black ; poisers ferruginous. Length of the 

 body 2i lines ; of the wings 6J lines. 



a. Tristram da Cunha. (See Linn. Trans, xii.) From Dr. Leach's 

 collection. 



Medeterus glaber, Barnstoris MSS. Viridis, thoracis disco ni- 

 gro-ceneo, abdomine ameo-viridi, antennis nigris, pedibus viridi- 

 bus, tarsis nigris, alis cinereis fusco bimaculatis. 



Body green : head and chest beset with a few black hairs : 

 head covered with white bloom in the male, with golden bloom in 

 the female : eyes red : mouth and feelers black : disk of the chest 

 bronze-black ; sides covered with tawny bloom ; breast covered with 

 white bloom : abdomen brassy green, covered above with short taw- 

 ny hairs ; underside covered with white bloom : legs bright green, 

 rather stout, clothed with short black hairs and bristles ; hips 

 covered with white bloom ; feet black : wings gray ; each with two 

 small brown spots, one on the cross- vein, the other on the fourth 

 longitudinal vein, a little before half the distaQce between the cross- 

 vein and the tip of the wing ; wing-ribs pitchy ; veins black ; poisers 

 tawny. Length of the body If line ; of the wings 5 lines. 



a. St. Martin's Falls, Albany River, Hudson's Bay. Presented by 

 G. Barnston, Esq. 



Medeterus chrysologus, Barnston s MSS., fem. Nigro-ceneus, an- 

 tennis nigris, pedibus viridibus, tarsis nigris, alis cinereis, fusco 

 bimaculatis ad costam subfuscis. 



Body brassy black : head covered with golden bloom, which is 

 paler and brighter towards the mouth : eyes dark red, covered with 

 white down : mouth and feelers black : sides of the chest covered 

 with tawny bloom : breast and underside of the abdomen adorned 

 with white bloom ; a row of black punctures on each side of the ab- 

 domen, as in other species: legs green, clothed with black hairs and 

 bristles ; hips and thighs covered with white bloom ; feet black : 

 wings gray, brown along the fore borders; each with two darker 

 brown spots like those of M. glaber, but larger and more distinct ; 

 wing-ribs tawny ; veins black ; poisers pitchy. Length of the body 

 li line ; of the wings 3 lines. 



a. St. Martin's Falls, Albany River, Hudson's Bay. Presented by 

 G. Barnston, Esq. 



3 M 2 



