A/rir (Itl/ih-nn. *? 



Fauna, viz. the groups of ini/xfu.r and o!' st'ruihm ; and only these two- 

 arc indeed represented in the collections of the South African Museum. 

 Some species previously included in the genus will lie removed to the 

 new genus Gonarthrus. All the species here enumerated have the eyes 

 of the male separated or only approximate ; they can he distinguished 

 as follows : 



1 (4). Species of great size and of broad, stout body; metapleurae bare; 



antennae widely separated at the base, with the first joint thickened ; 

 bind femora without bristles below, only with rigid black hairs ; 

 tibiae with black spicules ; wings short, with the discal cross-vein 

 placed much after the middle of the discoidal cell ; upper branch of 

 the cubital fork less retreating ; alula small and not fringed (group- 

 mystax). 



2 (3). Proboscis short, not longer than the thorax ; palpi concealed ; femora 



black, with only the end yellow and with numerous rigid black hairs 

 below ....... i-ii/iito, Loew. 



3 (2). Proboscis as long as the body: palpi long and feathered; femora 



yellow, without black hairs below, or only with a very few thin ones on 

 the hind pair. ..... plumipalpis, sp. nov. 



4 (1). Species of small size and of more elongate body ; metapleurae haired ; 



antennae approximate at base, with non-thickened first joint ; hind 

 femora with yellow bristles below ; tibiae with yellow spicules ; discal 

 cross-vein set much before the middle or rarely in the middle of the 

 discoidal cell ; upper branch of the cubital fork much retreating, 

 alula broad and fringed (group serlatus). 



r > ((>). Wings very short, with the discal cross-vein placed on the middle of 

 the discoidal cell, which is short and broad, triangular ; the two basal 

 joints of the antennae, scutellum and legs entirely of a yellowish- 

 red colour : pulvilli long . . rubicundus, sp. TLOV. 



i> (.">). Wings of usual length, with the discal cross- vein set much before the 

 middle of the discoidal cell which is variable in shape ; base of the 

 antennae, scutellum and legs never completely yellow at the same 

 time ; pulvilli usually much shorter than the claws. 



7 (S). Antennae, scutellum and legs entirely black ; discoidal cell as long as 

 broad; body clothed with silvery long hairs and below these with 

 yellow tomentum ..... nin-ns, Macq. 



s (7). Legs mainly yellow, at least on the tibiae; discoidal cell elongate.!, 

 often veiy much longer than broad. 



9 (14). Proboscis entirely black : frons in the known females narrow. 

 Hi (13). Scutellum black; proboscis short; wings small, entirely hyaline;, 

 discoidal cell rather short, not twice as long as broad ; femora not 

 black striped. 



11 (12). Femora entirely yellow, without distinct spines below; wings with 



rather distinct basal comb ovatus, sp. nov. 



12 (11). Femora black, with distinct bristles below on the hind pair ; wings 



with no distinct basal comb . . . seriatus, Wied. 



