104 Annals of the South African Museum. 



J 1 . Length of the body 14-15 mm. ; of the wing 6'8-7 mm. ; of 

 the wing spread 15'5-17 mm. Occiput bare, dull black, with a faint, 

 dark grey dust near the border ; the very small, less prominent, bare 

 ocellar tubercle is red. Eyes united for a space about as long as the 

 frontal triangle ; the latter narrow and very acute above, bare, red, 

 with a tuft of short dark hairs in the middle ; mouth sides silvery, 

 shining, red <>n terminal and pale yellowish on basal half and on fore 

 border of chin, which is black with scattered darkish hairs like the 

 lower part of the occiput. Antennae with the first joint as long as 

 the two following joints together, red, with short blackish hairs ; 

 second joint black, one-fourth as long as the first, third joint black, three 

 times as long as the second, narrowly oval and flattened. Proboscis 

 black. Thorax deeply punctulate 011 the back and therefore rather 

 dull ; it is black in centre, red on sides and in front of the scutellum ; 

 the black of centre runs in front as a narrow point to the junction of 

 head. Pleurae red, with a broad black patch on mesopleurae, con- 

 tinued as a stripe in front below the hunieri; themetasteruum is broadly 

 black behind, and is clothed with silvery, shiny pubescence ; the back 

 of mesonotum has a short, pale yellowish pubescence, like the meso- 

 pleurae. Squamulae brown, with scarce dark hairs at border ; halteres 

 with dark yellowish stalk, and with the knob pale yellowish below, 

 black above. Scutellum entirely black, like the mesophragma ; lateral 

 callosities yellow. Abdomen with a long cylindrical stalk formed by 

 the hind half of the first segment, and by the whole of the second, of 

 the third and of the fourth segment, the terminal club being thus 

 formed by three segments only ; first segment with the broad basal 

 half black, punctulate and pubescent like the back of mesonotum, but 

 with a red transverse stripe at the extreme base ; the rest of the first 

 segment as well as the whole of the abdominal stalk to the end of the 

 fourth segment are entirely red above and below ; the fifth, sixth and 

 seventh segments are black, rather shiny, but the fifth is broadly red oil 

 the sides below in front. Genitalia red above, black below, with the 

 prominent, spine-like lamellae black. Legs and coxae entirely red, but 

 the front coxae are bristly black on the front side ; the 4 terminal 

 joints of the tarsi are blackened ; hind legs with the tibiae black on 

 the thickened terminal part, and with the tarsi entirely black ; spines 

 of hind tibiae 2:5:2. Wings greyish-hyaline with two distinct 

 yellowish longitudinal stripes, one along the upper part of the first 

 basal, the base of the marginal and almost the whole of the first sub- 

 marginal cell except at its end ; the second along the base of the 

 second basal and the upper part of the anal cell ; subcostal cell and 

 stigma dark yellowish. Upper branch of the cubital fork originating 



