288 ERNEST E. AUSTEN—NEW AFRICAN 
haus, which, on middle and hind tarsi, are mixed with minute black hairs ; distal 
extremities of joints of front tarsi fringed on each side with longer hairs. 
O.—Head light grey, face, jowls, and basioccipital region clothed with whitish 
hair ; front narrower below (at lower extremity about four-fifths as wide as at 
vertex), upper two-thirds (except sides) clothed with short, erect, blackish hairs, 
lower third clothed with minute, appressed, Naples-yellow hairs, which also 
extend on to sides of upper portion ; just below middle of front most specimens 
exhibit a mummy-brown mark, which is in contact with the eye on each side and 
is sometimes shaped like a wide VY or nearly straight transverse band, but more 
usually consists of a downwardly directed median portion (generally the only 
part of the mark visible when the insect is viewed directly from above*), con- 
nected with each eye by acurved, transverse offshoot; frontal callus in absolutely 
undenuded specimens entirely concealed by the grey pollinose covering of the 
head, but when exposed flat, small, yellowish horn-coloured and usually semi- 
circular in outline, with its straight edge resting on the upper margin of the 
subeallus, and elsewhere with a narrow mummy-brown border, which is widely 
separated from the eye on each side ; in specimens in which the frontal callus 
is not fully exposed, its position is nevertheless often indicated by its mummy- 
brown upper margin ; cyes sparsely clothed with minute pale hairs, just visible 
under a hand-lens magnifying 15 diameters (nominal) when the eyes are brightly 
illuminated and viewed against a dark background; palpi cream-coloured, 
preximal joint clothed with long, whitish hair, distal joint viewed from side 
shortly acuminate (swollen or strongly swollen at base and tapering quickly to a 
point), clothed on outer side with minute, appressed, silvery white hairs mixed 
with minute black hairs, and at base below with longer whitish hair; antennae 
agreeing generally in coloration with those of 4, but expanded portion of third 
joint usually broader (sometimes much broader and dark brown or brownish 
above), and annulate portion of same joint stouter. Thorax: ground colour, 
pleurae, and pectus as in G, except that ground colour of distal extremity of 
scutellum is chestnut or cinnamon-rufous ;{ dorsum greyer than in 3, longitudi- 
nally striped with light grey as shown in fig. 2, the paired, admedian, grey 
stripes usually broader than in 4; hairy covering of dorsum consisting of short, 
appressed, ochre-yellow or pale ochre-yellow hairs, mixed with longer and more 
erect blackish hairs, and with short black hairs on (at least posterior extremities 
of) admedian dark stripes, and on median portion of basal half of scutellum. 
Abdomen (cf. fig. 2): grey stripes on dorsum clothed with minute, appressed, 
cream-coloured or pale yellow hairs, dark markings clothed with black hairs of a 
similar character ; on the penultimate and antepenultimate segments (frequently 
also on others as well) the pale yellow hairs on the grey markings are freely 
interspersed with longer black hairs ; dorsal surface of last segment almost 
exclusively if not entirely clothed with black hair; sides of dorsum fringed 
with whitish hair, which however is not so long as in G ; ventral surface of first 
* Tt is this median portion which is shown in the figure on p. 286, where it appears somewhat 
too dark ; 1t must not be mistaken for the frontal callus. 
+ A trace of chestnut in the ground colour is often seen at the tip of the ¢ scutellum 
also. 
