152 Mr. F. Walker's Characters of undescrihed Diptera 



Genus Ceria, Fabr. 

 Ceria divisa. 

 Nigra, segmentorum abdominalium marginibus posticis flavis, 

 pedibus ferrugineis, femoribus nigricantibus, alls cinereis 

 apud costam nigricante-trimaculatis. 

 Black ; bind borders of tbe abdominal segments yellow ; legs 

 ferruginous, hind femora blackish ; wings grey, with three blackish 

 costal spots, the third apical and larger than the others. 

 Length of the body 4 lines; of the wings 7 lines. 

 Port Natal, 



Genus Microdon, Meig. 

 Microdon testaceus. 

 Ferrugineus, capite supra nigricante-caeruleo, tibiis albidis, 



supra apice tarsisque nigris, alis subcinereis. 

 Ferruginous, clothed with short hairs ; head above blackish 

 blue ; scutellum bidentate ; tibiae whitish, black above towards 

 the tips, tarsi black ; wings greyish, veins black, ferruginous to- 

 wards the base. 



Length of the body 5 lines ; of the wings 1 lines. 

 Port Natal. 



Genus Helophilus, Meig. 

 Helophilus strenuus. 



Mas. — Niger, thorace vittis quatuor testaceis, scutello luteo, 

 pectore cinereo, abdomine luteo fasciis vittaque interrupta 

 cyaneo-nigris, femoribus posterioribus incrassatis, alis sub- 

 cinereis. 

 Male. — Black; head with white tomentum in front; thorax 

 with four testaceous stripes ; scutellum luteous ; pectus cinereous ; 

 abdomen luteous, with a bluish black interrupted stripe, and a 

 bluish black band on the hind border of each segment; posterior 

 femora very thick, with cinereous hairs ; wings greyish, veins 

 black, ferruginous at the base. 



Length of the body 9 lines ; of the wings 14 lines. 



Helophilus scitus. 

 Fasm. — Niger, capite ferrugineo, peristomatis lateribus albis 

 nigro-notatis, thoiace vittis fasciisque tribus luteis, scutello 



