412 Miss G. Ricavdo — A Revision of 



and sixth as in the "Wiedemann species. A tuft of white 

 hairs is present on the forehead, -^liich is usually absent in 

 B. coriarius, and the -^-hite hairs on the coxae are chiefly 

 limited to the auterior pair. It is distiuguished from B. vivax, 

 Hermann, by the absence of any bright colouring on the 

 thorax, and the tvivgs are lighter, not black with violet 

 reflections ; the abdomen also paler. 



Male. — Abdomen pale yellow, rather narrow compared with 

 those of other species of this genus, bordered by black tufts 

 of hair, with which white hairs are intermixed below. 



Length 30 mm. 



Face black, covered with yellowish tomentum, and with 

 long pale yellow bristles forming the moustache, chiefly con- 

 fined to the oral opening. Palpi with black hairs. Beard 

 white. Antennae black, the third joint long, with a short 

 bristle. Forehead with black pubescence, and a tuft of 

 white hairs anteriorly on each side. Hind part of head with 

 long white hairs and some shorter black hairs at vertex. 

 Thorax black, with some grey tomentum on dorsum ; sides 

 with black bristles and grey tomentum ; breast black, with 

 grey tomentose stripes. Scutellum dark brown, with black 

 bristles. Abdomen with the first segment black, with black 

 hairs, the remaining ones pale yellow, the posterior borders 

 paler ; the white hairs at sides are below the black ones and 

 most apparent on the fourth, fifth, and sixth segments ; 

 underside dark brown, with chiefly black pubescence. Legs 

 black, femora armed with black bristles, the pubescence on 

 the fore coxae long, yellowish white ; a few are visible on the 

 other coxae, otherwise their pubescence is black. Wings dark 

 grey, with reddish-yellow veins, the posterior branch of fork 

 strongly curved, the second posterior cell wide, almost 

 touching the former vein at one place; the third posterior 

 very wide, twice the width of the second at its widest part ; 

 the fourth posterior closed, the anal closed near the border ; 

 the small transverse vein about the middle of the discal cell, 

 which is long and narrow. 



Female. — Abdomen is darker yellow and broader, not so 

 glabrous as is that of B. coriarius ; the white hairs at sides 

 are more apparent than in the male. Ovipositor blackish, 

 short, not compressed at sides. 



Length 35 mm. 



Promachus, Loew. 



Linn. Ent. ill. p. 390 (1848). 

 Bactria, Meg., in litt. apiid Meig. 



