﻿ERNEST E. AUSTEN — NEW AFRICAN TABANiDAE— PART ill. 40l 



on hind margin with a small median patch of appressed pale yellowish hair ; 

 posterior angles and lateral margins (except anterior halves of lateral margins in 

 case of second and third segments) of tergites of following segments clothed with 

 silvery-white hair, which is longest on posterior angles of fifth tergite ; second 

 and third tergites each with a median patch of appressed, glistening whitish hair 

 on or adjacent to hind margin, and on hind border on each side of this patch, and 

 between it and posterior angle, clothed with appressed, glistening, ochreous or pale 

 yellowish hair ; hind borders of fourth and fifth tergites, except rather less than 

 median third in case of latter, clothed with appressed glistening whitish hair, 

 which on fourth tergite in middle line also extends forwards as a roughly tri- 

 angular patch almost reaching front margin ; dorsum of abdomen, except as 

 already stated, clothed with appressed black hairs ; venter ochraceous-buff (last 

 two segments mouse-grey), speckled here and there with clove-brown or mouse- 

 grey, and clothed with short, appressed, glistening, cream-buff-coloured hair. 

 Wings conspicuously broader across centre of basal and axillary cells than at 

 distal extremity, faintly tinged with drab, extreme base, third costal cell, and 

 veins or portions of veins bounding distal extremities of basal cells suffused with 

 light mummy-brown, second costal cell light raw-umber-coloured. Squamae 

 cream-buff. Halteres light sepia-coloured. Legs : front and middle coxae clove- 

 brown, grey pollinose, clothed with whitish hair, which is especially long and 

 dense on front pair, hind coxae dark grey in front, greyish-buff posteriorly, 

 clothed with whitish hair ; front femora, except extreme tips, upper surface of 

 middle femora, and extreme base and distal extremities of middle and hind 

 femora, also except extreme tips, dark brown, extreme tips of all femora buff, 

 middle and hind femora except as already stated, ochraceous-buff, all femora 

 clothed with whitish or yellowish-white hair ; tibiae and tarsi dark brown or 

 clove-brown, clothed with black hair, which on hind tibiae forms a fringe on inner 

 and outer surfaces, anterior surface of front and middle tibiae, except at distal 

 extremities, clothed with minute, appressed, glistening yellowish hairs. 



Northern Khodesia : Feira District, 1911 (E. A. Copeman). 



Diatomineura lineatithorax, which agrees with the following species in the 

 shape of its wings, is by reason of its thoracic markings easily distinguishable 

 from any of its African congeners known to the author. 



Diatomineura penetrabilis, sp. n. 



Q. — Length (1 specimen) 18 mm. ; width of head 5'4 mm. ; width of front at 

 vertex 1 mm. ; distance from upper margin of occiput to anterior extremity of 

 face 4*6 mm. ; length of proboscis 15 mm. ; length of wing 18'5 mm. 



Front and upper surface of face dusky yellowish pollinose ', front clothed entirely 

 with pale yellowish hair ; dorsum of thorax dark olive-brown, dusky yellowish-grey 

 pollinose, practically unicolqrous, without conspicuous markings ; tergite of first 

 abdominal segment raw-sienna-coloured, ivith a greyish clove-brown median blotch 

 at base ; tergites of next three segments brownish tawny, each with paler hind border 

 and an irregularly shaped, more or less transversely elongate, clove-brown or black 

 median spot or blotch at base ; tergites of last three segments clove-brown, their 

 lateral borders and hind margins dull yellowish ; wings conspicuously narrower at 



