NOTES ON THE NOMENCLATURE OF CERTAIN AFRICAN TABANIDAE. 147 



species, which, at the end of May 1914 and at the close of the same month and 

 beginning of June 1918, was found by him in great abundance in the vicinity of 

 Kakanu, N. Katanga, at and about the flowers of Acanthus montanus (termed by 

 the natives " Nafimbia"), which grows in sheets in open spaces outside the forest. 

 According to Dr. Schwetz, the existence of C. inornata is " intimately connected " 

 with that of the flowers in question, the nectar of which is imbibed by both sexes, 

 though the females also suck blood on occasion. It is interesting to note that, 

 having in a number of cases observed the process of sucking blood by females of this 

 and the foregoing species (Corizoneura schwetzi, Austen), Dr. Schwetz states that, 

 in these Pangoniinae at any rate, the actual piercing organ is the proboscis (labium) 

 itself, which is " evidently sufficiently rigid " to penetrate the human integument, 

 and is driven by the insect " fairly and squarely into the skin to the extent of 

 one-third or one-half of its length. . . ." * 



Genus Pangonia, Latr. 

 Pangonia discors, sp. n. 



$. — ^Length (1 specimen) 19*6 mm. ; width of head 5'6 mm. ; width of front at 

 vertex 0'75 mm. ; distance from upper margin of occiput to anterior extremity 

 of face 4'5 mm. ; length of proboscis 5*5 mm. ; length of wing 17 '6 mm. 



Deep black, somewhat shining ; first (visible) and second abdominal tergifes densely 

 covered with pale gull-grey pollen, and thickly clothed with closely appressed, silvery 

 white hair ; area beneath scutellum free from pollen and clothed with black hairs, some 

 black hairs also present in middle line on anterior border of second tergite, latter likewise 

 exhibiting a broad, median, triangular area (its base resting on front margin, its apex 

 directed backwards and reaching beyond middle of segment) which, like front border of 

 same segmeyit, has a blackish look owing to pollen on it being thinner than elsewhere ; 

 lateral extremities of second tergite clothed with black hair ; wings mummy-brown, 

 proximal half (as far as base of discal cell) and stigma pale orange-yellow or light orange- 

 yellow. 



Head : ocelli wanting ; face moderately prominent, front above relatively some- 

 what narrow ; area from middle of front to anterior margin of clypeus olive-buff, 

 upper half of front fuscous black, sides of face clove-brown, occiput and basi-occipital 

 region smoke-grey or pale smoke-grey, jowls clothed with yellowish cream-coloured 

 hair ; palpi clove-brown, terminal joint elongate, tapering to a point and somewhat 

 curved ; first and second joints of antennae dark mummy- brown, clothed with 

 minute black hairs mixed with some minute yellowish hairs, first joint short, expanded 

 portion of terminal joint cinnamon-brown (terminal portion missing in case of type). 

 Thorax : postalar calli chestnut-brown ; dorsum including scutellum clothed with 

 short black hair, which on front border of scutellum is interspersed with minute, 

 glistening, appressed, golden hairs, a few golden hairs also on upper portion of 

 swelling occupying depression at each end of transverse suture, hair on pleurae and 

 pectus entirely black or fuscous black. Abdomen : third (visible) and following 

 tergites clothed with appressed, black hair ; venter, except second sternite, clothed 

 with appressed, black or brownish black hair, ventral surface of second segment 



* Cf. Schwetz, Rev. Zool. Africaiae, vii, pp. 101-102 (1919). 



