344 LIST OF DIPTERA. 



two rows of round punctures, of which the three on each side of the 

 middle of the furrow form an angle upwards ; segments from the 

 third to the last successively decreasing in length ; fourth segment 

 white, and having on its fore border two rows of punctures disposed 

 like those of the preceding segment ; fifth segment white, with a 

 single row of punctures on its fore border, having — as has also the 

 fourth — some punctures on the middle of each side ; sixth segment 

 deep rich brown, white on each side of the fore border, where there 

 is a single row of punctures ; seventh and eighth segments black ; 

 under-side gray, black at the tip : legs black, clothed with black 

 hairs ; shanks beset with some black bristles, more hairy than the 

 thighs, but less so than the feet, where the black bristles are also 

 most numerous ; claws black ; foot-cushions piceous ; fore legs 

 armed with a long curved black tooth at the tip of the shank, and 

 with a short obtuse black tooth at the base of the foot : wings with 

 a very slight tawny tinge, gray at the tips ; wing-ribs and veins 

 black ; poisers piceous. Length of the body 8 lines ; of the wings 

 16 lines. 



a. Venezuela. From Mr. Dyson's collection. 



Dasypogon Otacilius, n. s. Niger, capite nigro-fusco, thorace albo 

 quadrivittato, abdomine croceo basi piceo apice ferrugineo, an- 

 tennis nigris, pedibus ferrugineis, tibiis. tarsisque apice, genubus, 

 femoribus supra coxisque nigris, alis fulvo-fuscis cceruleo mican- 

 tibus ad cos tarn cinereis. 



Head dark brown, white and clothed with black hairs behind, 

 covered with dark ferruginous silky down between the base of the 

 feelers and the clypeus, which is armed with six long black bristles 

 and with some black hairs ; there is a band of the same ferruginous 

 hue between the base of the feelers and the tubercle of the eyelets : 

 eyes dark bronze colour, divided as usual into two parts, which are 

 distinctly marked : lip black, ferruginous and clothed with short 

 whitish hairs at the tip : feelers black ; first and second joints of 

 nearly equal length, clothed with black hairs ; third joint long club- 

 shaped, conical at the tip, more than twice the length of the first 

 and of the second joints : fore chest and chest deep velvet-like black, 

 the latter with four shining white stripes ; the two middle stripes are 

 short in front, but the side stripes are longer, and converge towards 

 each other on the fore border of the chest ; scutcheon, hind chest 

 and breast also more or less overspread with silvery white down : 

 abdomen orange, decreasing in breadth from the base to the tip, 

 clothed with a few yellow hairs, narrower than the chest and less 

 than twice its length ; first segment piceous, very short ; second 

 segment short, raiher broad and convex, and having a cluster of 





