LIST OF DIPTERA. 475 



first and second segments short; third and following segments long, 

 successively decreasing in length : legs tawny, clothed with short 

 black hairs, beset with black spines ; hips hoary ; thighs and shanks 

 more or less black towards the tips ; feet black, tawny at the base 

 foot-cushions piceous : wings nearly colourless, brown towards the 

 tips, and thence for half the length along the hind borders; wing- 

 ribs and veins black ; poisers tawny. Length of the body 6 lines ; 

 of the wings 12 lines. 



a. Jamaica. From Mr. Gosse's collection. 



Ommatius Pera, n. s., fern. Fuscus, thoracis vitlis duabus cinereo- 

 fulvis, marginibus scutelloque cinereis, pectore cano, antennis 

 fulvis, pedibus flavis, tarsis obscurioribus, femoribus tibiisque 

 apice nigriS) alis subfuscis. 



Body brown: head full as broad as the chest, covered with 

 hoary down, clothed behind and beneath with white hairs, beset be- 

 jhind the eyes with a few black bristles; tubercle of the eyelets 

 clothed with a few black hairs ; clypeus in front armed with white 

 bristles, its hinder part and the adjoining part of the front beset 

 with longer black bristles : eyes bronze ; fore part flat, its facets 

 much larger than those of the other part : lip black, clothed at the 

 tip with short whitish hairs ; palpi black, clothed with long black 

 |hairs : feelers pale tawny ; first and second joints beset with short 

 black hairs ; second joint much shorter than the first : chest beset 

 on each side and behind with a few white bristles, adorned with two 

 dull grayish tawny stripes; fore chest, scutcheon, hind chest, and 

 sides gray ; breast hoary : abdomen much narrower than the chest, 

 and nearly twice its length, almost linear from the second segment 

 to the tip, clothed with short pale yellow hairs and with longer hairs 

 on each side, especially towards the base ; first and second segments 

 jvery short; second segment broader and more convex than the 

 third ; third and following segments long, successively decreasing 

 in length : legs yellow, clothed with pale yellow hairs, armed with 

 bale yellow and black spines ; tips of thighs and of shanks black ; 

 'feet tawny, piceous towards the tips ; hind feet black, piceous at the 

 'base; claws black, tawny at the base; foot-cushions tawny : wings 

 slightly tinged with brown : wing-ribs piceous ; veins black ; poi- 

 jsers tawny. Length of the body 6 lines ; of the wings 12 lines. 



2t3 



