S64 REPORT OF THE HARVARD AFRICAN EXPEDITION 
always over half the length of the first, often equally long, rarely longer; the 
third composed of five main divisions, but the basal division frequently more 
or less subdivided, sometimes quite deeply so. This tribe apparently com- 
prises but one genus, Chrysops Meigen. All the several names proposed for 
divisions of Chrysops are at most of subgeneric value. Even Nemorius Rondani 
does not seem to be a valid genus. 
2c. Tribe Scupsrprni. — Eyes bare, in life without spots or streaks. Ocelli 
present. Proboscis and palpi vestigial or aborted. Antennae short, the second 
segment at most half as long as the first. This tribe comprises Scepsis Walker, 
Adersia Austen, Braunsiomyia J. Bequaert (= Brodenia Surcouf), and Lesneus 
Sureouf. The three last-named genera are African. Scepsis is supposedly 
South American, but the single species, S. nivalis Walker, is known only from 
the poorly preserved type specimen.' 
3. Subfamily TaBaninan. — Eyes more or less broadly separated by the 
frons in the female, contiguous (holoptic) in the male. Ocelli generally absent, 
sometimes vestigial, rarely well-developed. Proboscis at most as long as the 
head. Hind tibiae without spurs. Wings with the sixth longitudinal vein 
(An) straight. 
This subfamily consists of two natural divisions, or tribes: 
3a. Tribe TaBanrini. — Eyes bare, pubescent, or hairy, uniformly colored 
or with cross-bands, very rarely with numerous rounded spots or with zigzag 
markings. Frons of female elongate, longer than wide. ‘Third antennal seg- 
ment almost always composed of five divisions, the basal division as a rule 
more or less expanded, often toothed or angulate at the base (in Thaumas- 
tocera the third segment consists of three or four divisions, but the basal division 
bears a long tooth). This tribe comprises most of the genera of the Tabaninae, 
but is only represented in Africa by Tabanus Linnaeus and T'hawmastocera 
Grinberg. 
36. Tribe HAEMATOPOTINI. — Eyes bare, very rarely pubescent, in life 
usually with peculiar zigzag markings. Frons of female wide, often about as 
wide as long or wider, with two or three velvety spots; the basal callosity 
transverse. Third antennal segment as a rule composed of four divisions, 
rarely of three or five, the basal division never crescent-shaped or toothed. 
This tribe comprises only three genera: Haematopota Meigen, Hippocentrum 
Austen, and Heptatoma Meigen, the former two being found in Africa. 
Two other genera are placed by Enderlein in his ‘‘subfamily’”’ Haemato- 
potinae (characterized by the third antennal segment of four divisions, rarely 
of three), viz., Dasybasis Macquart and Baikalia Surcouf.? Macquart’s genus 
was erected for an Australian species and Enderlein evidently has followed the 
original description and figures. Australian students of Tabanidae are of the 
opinion that Dasybasis owed its origin to a mistake in counting the divisions 
of the third antennal segment, and should be sunk under Tabanus (see Fer- 
1 Miss Ricardo (1901, Ann. Mag. Nat. Hist., (7) VIII, p. 286) says that the type of S. nivalis is a 
female, without antennae. Surcouf states that it is a male. I believe that Miss Ricardo was correct. 
2 This name being preoccupied by Bazcalia v. Martens, 1876, I have changed it to Surcoufiella 
J. Bequaert (1924, Psyche, XX XI, p. 26). 
