DIPTEEA. 73 



from its base ; a broad brown band extends nearly to the hind border from 

 the latter part of the brown on the fore border ; wing-ribs and veins pitchy, 

 the latter partly tawny : scales grayish tawny, with darker borders ; poisers 

 pitchy. Length of the body 4 lines ; of the wings 9 lines. 



Cape Breton, 



Cheysops provocans, Fora. 



Nigra, capilefulvescente,antennis nigris basi fulvis, pedibus n'ujris, tarsh 

 posterior Ibus hasi ferrugineis, alls limpidis fusco viltatis et fasciatis. 



Body black : covering of the head hoary above, tawny in front, in- 

 cluding some large black shining marks which are situated like those of 

 C. excitans ; the pair on the face are much larger than those of the pre- 

 ceding species : eyes black ; all the facets very small : sucker black ; 

 lancets dark tawny ; palpi pitchy : feelers black, like those of C. excitans, 

 but the first and second joints are clothed with hoary hairs : chest and 

 breast tinged with gray ; a tuft of pale yellow hairs on each side at the 

 base of the wings : abdomen slightly'obcouical, clothed with a very few 

 short hoary hairs, a little broader and much longer than the chest : legs 

 black ; shanks and feet clothed with very short black hairs ; four hinder 

 feet dark ferruginous at the base ; foot-cushions dark tawny : wings colour- 

 less, brown at the base, along three fourths of the fore border, and beneath 

 the fore border on one fourth of the length and half of the breadth of the 

 wing from the base ; a broad brown band extends from the fore border and 

 approaches nearer to the hind border than that of C. excitans ; wing-ribs 

 and veins black ; scales gray with pitchy borders ; poisers pitchy. Length 

 of the body 3^ lines ; of the wings 8 lines. 



Cape Breton, 



Chrysops stimulans, Mas. 



Nigra, capite siibtus pectore abdominisque maculis duabus basi cants, ab- 

 domine maculis trigonis fulvis triviltato, antennis pedibusque nigris, 

 tarsis posterioribus basi tibiisque intermediis fulns, alis limpidis 

 nigra vittatis fusco fasciatis niargine postico cinereis. 



Body black : covering of the head hoary in front and beneath where 

 it is clothed with hoary hairs ; a tawny tinge on the face, which has on 



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