ENTOMOLOGY 907 
Group A (Huancala) 
7. Wing moderately black, abundantly marked with hyaline; basal third and apex with 
very little black. Tip of abdomen with orange or reddish-yellow pubescence. 
caren Gnves MM aS eae coe 4 Jd pina anrudpiyis a au ya «dds rs T. maculatissimus. 
Wing much darker, speckled with hyaline; the base and apex extensively blotched with 
black. Tip of abdomen with black pubescence. Length, 14 to 15mm... T’. irroratus. 
Group B (Ancala) 
8. Antennae pale yellow in the basal two-thirds, more or less infuscate at the apex. Wing 
mostly hyaline, the base and a transverse median band Bae brownish. Abdomen 
more or less greenish in life. Length, 14 to 17 mm. a . T. fasciatus. 
Antennae entirely black or dark brown. Wing with darker, more distinct bands which 
are more or less connected. Abdomen not greenish in life. . 9. 
9. Large species, 20 to 21 mm. long, entirely brownish red dorsally ; under side of the « abdo- 
men black, each sternite with a narrow, yellow, apical margin. Black base of wing 
not peicndine into the basal cells and without hyaline spot, not connected with the 
Medion Hane sulome tiveramral Gelils <2 sacue deco =o Shoo Hers ce cul ae min oa elowinin Seho T. brucei. 
Smaller species, 16 to 18 mm. long. Abdomen brownish red, dorsally with black spots 
in the anterior angles of tergites 3 to 7, each followed by a patch of white hair. Black 
base of wing extending into the basal cells and with a hyaline spot, also more or less 
connected with the median band along the anal cell...................2- 000200 10. 
10. Apex of wing hyaline, anterior margin not darkened beyond the median band; the latter 
shortened so as not to reach the hind margin of the wing................. T. latipes. 
Apex of wing blotched with black along the anterior margin beyond the median band; the 
latter reaching the posterior margin of the wing.....................-. T. africanus. 
Group C (Therioplectes) 
11. Mostly black; humeral and prealar calli pale yellowish; first and second abdominal 
tergites broadly reddish-yellow on the sides and hind margins; extreme hind margins 
of second and following tergites whitish. Legs blackish brown; tibiae dirty white; 
extreme apices of middle and hind tibiae and distal half of fore tibiae infuscated. 
Wing subhyaline, with distinct brown stigma. Third antennal segment very slender, 
a little widened at the base and with a small upper prominence. Frontal callus 
small, reddish brown, oval, the line proceeding from it indistinct. Length, 16 mm. 
yA Mm Ne ae eR eate ck ee Ee MSpe RUN pee Our PEERS ae beleste ed Gane T. ruwenzoriv. 
Group D (Sziladynus) 
12. Mostly blackish brown, densely covered with grayish white pollinosity forming faint 
longitudinal bands on the thorax and three series of indistinct spots on the dorsum of 
the abdomen. Wing hyaline, with indistinct, gray stigma. Legs black, the tibiae 
whitish. Frontal callus large, square; a median, black line above it. Third antennal 
segment short and much widened at base, with a prominent, blunt upper edge. 
RCRD Mel MULLEN ce roe A Renee Rina abe nladt ora, kore eaten Viena a UE KK Mok oN T. muluba. 
Group E (Atylotus) 
13. Abdomen black; with two narrow yellowish stripes removed from the side margins, 
covered with grayish white pubescence and continuous from the base to near the 
apex; the median dark band between them with light spots of gray pubescence 
sometimes forming a continuous stripe, but more often indistinct. Frons with two 
minute callosities of about equal size. Eyes uniformly colored in life. Length, 
Dereon RR wil sonar wee oer, 2 Wier ee cniuavblc oe aimeds Ww OA T. ditoeniatus var. bipunctatus. 
Group F (Tabanus, proper, in part) 
14. Head and dorsum of thorax densely clothed with white or yellow pile; the dorsum some- 
times with two black spots. Abdomen black, fringed with whitish pile on the sides 
of the apical segments. Antennae and legs black. Frons broad, two and one-half to 
