146 E. E. AUSTEN. 



only projects 7'5 mm. beyond the extremity of the clypeus, exceeding the length 

 of the labrum-epipharynx and the other mouth-parts by little more than the labella, 

 while the proximal portion of the labium is bent backwards underneath the head, 

 and beneath the cleft between head and thorax forms an angle of 45° with the distal 

 portion. 



Although superficially presenting a decided resemblance to Pangonia oldii, Austen, 

 Corizoneura schwetzi can be distinguished from that species inter alia by the processes 

 (entirely wanting in P. oldii) at the tips of the first and second joints of the front 

 tarsi in the ^ ; by the much greater development of the dark spot (often scarcely 

 more than vestigial in P. oldii) at the base of the second abdominal tergite in the 

 same sex ; and in both sexes by the short stripe of black hair on each side of the 

 dorsum of the thorax, in front of the base of the wing. 



From Corizoneura inornata, Austen, apart from obvious difierences in coloration, 

 especially the sharply bicoloured venter of the species just described, C. schwetzi is 

 distinguished by the inferior development of the processes at the tips of the first and 

 second joints of the front tarsi in the (J. Whereas in C. inornata (J each of these 

 processes is so long as to project beyond the tip (excluding the process in the case 

 of the second segment) of the following joint, in C. schwetzi ^ neither process reaches 

 the tip of the succeeding joint. 



Corizoneura inornata, Austen. 



Diatomineura inornata, Austen, Bull. Ent. Res. i, p. 282 (1911). 



This species was described from a single 9, obtained in September 1907, in 

 S. Katanga, Belgian Congo, between Bunkeya and Kambove, at an altitude of 

 3,500 ft., by Dr. Sheffield Neave. The kindness of Dr. J. Schwetz, in presenting 

 to the British Museum (Natural History) a large number of specimens of both sexes, 

 now renders it possible to indicate the distinctive characters of the ^. 



C. inornata, Austen, (J. — Apart from ordinary secondary sexual characters, 

 agreeing generally with the $ except as follows. Head : hair clothing jowls and 

 basi-occipital region often hoary or nearly white ; first two joints of antennae 

 clothed mainly with black hair. Thorax : pleurae on each side with a tuft of black 

 hair below base of wing. Ahdo7nen : first (visible) tergite with a median brownish 

 black area at base, projecting somewhat beyond scutellum, but not reaching hind 

 margin ; second tergite with a conspicuous, median, brownish black, triangular 

 spot resting on front margin, and varying in size in different individuals, but not 

 extending beyond middle of segment, if so far ; fifth and sixth tergites mainly 

 brownish black, blackish brown or clove-brown, each of the two preceding tergites 

 often with an ill-defined median blotch of same colour occupying anterior two-thirds. 

 Legs : front and middle femora clothed largely with black hair, at least towards base, 

 hind legs clothed mainly with black hair, processes at tips of first and second joints 

 of front tarsi very long, in each case projecting beyond end of following joint 

 (excluding process in case of second segment). 



In the papers already referred to,* under the name " Pangonia zonata'' Dr. 

 Schwetz has furnished a series of interesting field notes on the behaviour of this 



* P. 145, note.* 



