910 
33. 
34. 
30. 
36. 
of. 
38. 
39. 
REPORT OF THE HARVARD AFRICAN EXPEDITION 
extends into the marginal and fourth posterior cells. Median pale spots of the ter- 
eites large; only the first, second, and fifth with lateral spots in the hind corners; 
sternites and legs as im the var, congoieold.....:..-20 4s alee een = ee T. marmorosus. 
Pale and dark markings of the wing very indistinct; no transverse hyaline band in the 
center of the wing; the wing fairly uniformly infuscated, paler in the center of most 
of the cells, especially in the discal and second submarginal cells. Median pale spots 
of the tergites small, connected along the margins with larger pale spots in the hind 
corners; second to sixth sternites with narrow, white hind margins. Legs black, the 
basal two-thirds of the fore tibiae conspicuously white. Length, 15.5 to 18 mm. 
T. obscurefumatus. 
2. Abdomen dark reddish brown, dorsally with broad, dark golden yellow apical margins 
which expand laterally and form yellowish, median triangles on the middle tergites. 
Thorax dark brownish black, with yellow hair on the sides. Legs dark; tibiae red- 
dish brown. Frons about four times as long as wide. Wing faintly smoky. Length, 
OAT Wes Yann Ee Pe Oe ee See coe oe aie Oe ea T. fulvicapillus. 
Abdomen not dark reddish brown with golden yellow markings as indicated above..... 33. 
Wing strongly infuscated, with a paler, cinereous apex. Head and thorax densely 
clothed with white or yellowish pile, sometimes with two black spots on the dorsum. 
Abdomen either entirely black or with median white or yellowish spots on the 
third and fourth tergites. Frons about two and one-half to three times as long as 
wide, with only a basal callosity. Length, 17 to23mm............... T. biguttatus. 
Head and thorax not densely covered with white or yellowish pile contrasting with the 
black abdomen. In doubtful cases the wing not dark brown with paler apex...... 34. 
Sides of at least the first three abdominal tergites densely covered with bright yellow or 
grayish white pile, sometimes continued over the sides of the fourth and fifth; the 
second and third usually more or less dark in the middle, sometimes but faintly so; 
the fourth with a median, yellow or white spot close to the anterior margin. Head 
and thorax covered with grayish white pile. Wing fairly uniformly infuseated.... 35. 
The first three abdominal tergites not mostly covered with yellow or grayish white pile. 
Median pale spot, if present on the fourth segment, situated on the hind margin... 36. 
Chrome-yellow or grayish white area of the first three abdominal tergites ending abruptly 
at the hind margin of the third; the median, black area of these tergites narrow and 
ill-defined, often reduced to a triangular or elongate spot on the second and third, or 
on the second only. (Male similar to that of 7. biguttatus, but the wing dark brown 
throughout, without clearer apex, and the golden spots of the abdomen smaller or 
madishmes).«  Benoth, 20 tows Mi, «<< s.tw< val tgee mee eee ee T. xanthomelas. 
Chrome-yellow areas of the first three tergites continued over the sides of the fourth and 
sometimes even of the fifth; the median black stripe separating the two yellow areas 
much broader and with well-defined edges. (Male more like the female than in 
iD APTA OT HOUS Vy, MURSIUCEU IA, “22 INTIAN Se, 22 fate SG ae aes ees revere ie hee eae een) eee T. pluto. 
Abdomen only with the hind corners of the tergites and two median pale spots covered 
with white or yellow hair; the spots placed on the hind margins of the third and 
fourth tergites and sometimes narrowly connected with the hind corners.......... Ot. 
Either the third and fourth tergites without median spots, or else there are also median or 
lateral.spots-on some of the other tengites. i005 ..ih. wuss ot Ole bau ee ee eee 42. 
Wing dark brown with clearer, cinereous apex. Length, 17 to 23 mm. (See above). 
ees Pon cree eee eee ae ee CeCe res eR T. biguttatus. 
Wing not. dark browmwithecinereous apex.+ cs iencs. vive ensue ane deen 4 «we eee ee 38. 
Thorax dorsally with two complete, median, longitudinal, white stripes, which are nar- 
rower behind the transverse suture. Abdominal median spots large, not connected 
with the hind corners. Antennae and legs blackish brown, the tibiae pale reddish. 
Wing slightly infuscated, especially along the veins; the stigma pale brown. 
Length, 17.5 mm. RHA Sm in'y 2/4 ose aime viele Oe I Bias Hak alee eae RGR Ie T. niveinotatus. 
Dorsum of thorax not with complete, median, longitudinal, white stripes. Tibiae almost 
wholly bright white or cream-colored. Smaller species......................... 39. 
Median spots of the abdomen, anterior longitudinal stripes of dorsum (distinct as far as 
the transverse suture), and scutellum covered with golden yellow pile. Length, 
LLB es LZ WG Belden yore a ike oe Ne ie ogee ee ne a T. roubaudi. 
Spots and stripes of abdomen and thoracic dorsum silvery or grayish white........... 40. 
