LIST OF DIPTERA. 201 



cent, as long as the head and the chest ; first joint ferruginous, pi- 

 ceous at the tip ; second joint nearly as long as the first ; third joint 

 much less than half the length of the second : fourth joint very 

 slightly curved, nearly as long as the second : chest and breast very 

 dark gray, the former with three indistinct hoary lines along 

 its back, its sides and the hind border of its shield are adorned with 

 golden hairs : 'abdomen a little longer than the chest, black, clothed 

 with pale down, and having a large pale tawny spot on each side of 

 the base : legs piceous ; thighs and four hinder feet yellow, with 

 dark brown at the base and along the fore border ; there is also a 

 very broad cross band near the tip, which is gray ; veins yellow in 

 the colourless, piceous in the coloured parts of the wing ; poisers 

 dark piceous. Length of the body 3 lines ; of the wings 7 lines. 



a. Sierra Leone. Presented by the Eev. D. F. Morgan. 



Chrysops cincticornis, n. s., fem. Niger, capite, pectoreque piceis 

 pedibus nigris, tar sis piceis, alis fuscis fulvo fasciatis et vittatis. 



Head piceous, shining : eyes, palpi, and lancets also piceous ; 

 sucker black : feelers ferruginous, full half the length of the chest ; 

 first and second joints black, clothed with black hairs at their tips ; 

 third joint black, except at the base, a little longer than the first 

 and second, its jointed part is narrower than its base and much 

 curved : chest black, its side clothed with yellow hairs ; breast pi- 

 ceous : abdomen black, clothed with pale hairs which are most 

 thick along the hind borders of the segments : legs black ; feet pi- 

 ceous : wings brown with tawny tips, and having also a broad pale 

 tawny band which begins below the fore border, and continues 

 widening as it advances to the hind border ; there are two or three 

 pale tawny stripes between this band and the tip of the wing ; veins 

 piceous in the darker part, tawny in the paler part of the wing ; 

 poisers piceous. Length of the body 4| lines; of the wings 9 

 lines. 



Chrysops moerens, n. s. Fuscus, capite fulvo, thorace vittis quatuor 

 lateribus pectoreque canis, abdominis segmentis fulvo fasciatis 

 alboque maculatis, pedibus ferrugineis piceo variis, alis limpidis, 

 fascia basi marginibusque anticis fuscis. 



Head tawny, with two piceous shining tubercles above : eyes 

 purple and green : palpi tawny : lancets ferruginous : sucker pi- 

 ceous : feelers much shorter than the chest; first and second joints 

 tawny, beset with black bristles ; second joint much shorter than the 

 first ; third joint black ; a little longer than the first and second, 



