DIPTERA. 91 



D.AsypoGON iNSERENs, Mas. 



Piceus, capile, thoracis vitlis tribus lateribm scutello metathorace pcclore 

 abdonvhiisqite fasciis Jlavis, antennis piceis basifulvis, pedibus ferru- 

 g'meis,femoribus nigro vittatis, alls fulvis apice margineque postico 

 cinereis. 



Head adorned witli a yellow covering, beset behind the eyes with a 

 fringe of black bristles ; crown pitchy, shining ; epistoma armed with 

 about twenty white spines : eyelets tawny : eyes bronzed ; fore part flat 

 and composed of very large facets : sucker black ; palpi dark tawny, beset 

 with black bristles : feelers dark tawny ; first and second joints beset with 

 black bristles ; third pitchy, clothed with a few black hairs, tawny at the 

 base, slightly spindle-shaped, nearly twice the length of the first and the 

 second joints : chest pitclty ; three stripes, sides, scutcheon, hind part and 

 breast mostly yelloiv : abdomen pitchy, narrower than the chest and less 

 than twice its length, tapering from the base to the hind border of the se- 

 cond segment, slightly spindle-shaped from thence to the tip, beset with 

 black bristles on each side of the base, adorned with yellow bands ; the 

 first broad, on the first and second segments ; the second and third rather 

 narrow, on the hind borders of the second and third segments ; the fourth 

 very narrow on the hind border of the fourth segment ; tip clothed with 

 brown hairs ; legs dark ferruginous, armed with black spines ; thighs 

 streaked with black ; claws and tips of feet black ; tip-spines of fore-shanks 

 black, very much curved ; foot-cushions yellow : wings dark tawny, paler 

 on the disk, gray at the tips and along the hind border till near the base, 

 where they are paler ; wing-ribs and veins ferruginous ; poisers tawny, 

 with yellow knobs. Length of body 10 lines : of the wings 18 lines. 



D.vsYPOGON occiDENs, Mas. 



Niger, auratus, thorace vittis duabus ferrugincis ornato, abdomine fcrru- 

 gineo vittis aureis ct piceis ornato, antennis ru/is, pedibus fulvis, alis 

 cinereis, nervorum marginibus subfulvis. 



Head adorned with a golden covering ; a row of tawny bristles behind 

 the eyes ; crown pitchy, shining, beset with l)lack bristles ; epistoma armed 

 Avilh about twenty white bristles : eyes bronzed ; fore part fiat, the facets 



