LIST OP DIPTERA. 471 



hairs: breast and sides of the chest paler, covered with golden 

 down, and clothed with pale tawny hairs : abdomen black, very 

 little narrower than the chest, but nearly twice its length, nearly 

 linear for half its length, and thence slightly decreasing in breadth 

 to the tip, clothed with short tawny hairs ; sides and hind borders 

 of the segments tawny, especially beneath ; first and second seg- 

 ments short ; third and following segments longer, but successively 

 decreasing in length ; tip tawny ; legs stout, black, clothed with 

 short yellow hairs, and beset with black bristles ; hips covered with 

 golden down ; shanks bright tawny ; tips of hind shanks black ; 

 wings tawny, gray at the tips and along the hind borders ; wing-ribs 

 and veins ferruginous, the latter piceous towards the tips ; poisers 

 tawny. Length of the body 11 lines ; of the wings 22 lines. 



a. Sandwich Island. Presented by Captain Beechey. 



Ommatius Plautius, n. s., fern. Fuscus, thoracis vittis tribus abdo- 

 minisque segmentorum marginibus posticis fulvis, pectore ven- 

 treque cinereis, antennis pedibusque nigris, femoribus anticis 

 apice subtus rufis, tibiis anterioribus rufis nigro variis, alis sub- 

 fuscis apice j us cis. 



Body dark brown : head a little narrower than the chest, 



covered with hoary down beneath, and with yellow down above, 



clothed behind and beneath with white hairs, beset behind the eyes 



, with a row of black bristles ; sides of the crown beset with black 



bristles ; clypeus prominent, armed with black bristles, and in front 



with some long pale yellow bristles : eyes large, bronze ; fore part 



flat, its facets much larger than those of the other part : lip black, 



clothed at the tip with short pale yellow hairs ; palpi black, clothed 



i with long black hairs : feelers black ; first and second joints beset 



with short black bristles; second joint less than half the length of 



I the first : chest clothed with short black hairs, beset on each side 



! and behind with black bristles, adorned with three slender tawny 



stripes; side pair connected with the sides by two oblique tawny 



I bands : breast gray : abdomen narrower than the chest, and less 



| than twice its length, tapering from the base to the tip, clothed with 



' short black hairs, beset with a few black bristles on the sides of the 



hind borders of the segments ; hind borders of the segments dull 



j tawny ; under-side gray : legs black, clothed with short whitish 



I hairs, armed with black spines ; four front shanks dark red, striped 



| with black ; fore thighs red beneath at the tips ; foot-cushions 



! piceous : wings light brown, darker at the tips ; wing-ribs piceous ; 



1 veins black ; poisers tawny. Length of the body 12 lines ; of the 



1 wings 20 lines. 



a. 



? 



PART II. 2 T 



