954 
bo 
~I 
REPORT OF THE HARVARD AFRICAN EXPEDITION 
Antennae wholly pale yellowish; first segment short, not quite twice as long as wide 
at apex, not much swollen; basal division of third segment elongate, widened and 
somewhat angular above at the base, much longer than the first segment. Wing 
slightly smoky, with faint hyaline spots. Length, 11 mm............... H. tabanula. 
Body not Tabanus-like and not conspicuously marked as described above; or else the 
frons at least as broad as long or the antennae of a different shape.............-- 23. 
. Legs with many long, stiff bristles, especially marked on the fore and middle tarsi. 
S) 
Antennae long; first segment very slightly swollen, about two and one-half times as 
long as its greatest width as seen from above; basal division of third segment 
elongate-oval, more than twice as long as wide and about as long as the first segment. 
Frons slightly longer than wide at vertex, where it is very little narrower than at 
the basal callosity; with only two large, rounded, velvety, lateral spots. Length, 
ASTIN ING a ud ac erties ris ee Ona el PR rah: ag tre SN Roe ee era te a H. hirsutitarsus. 
Pars mot tmuswally bristly: vccs edy codes Sign hoe eee ae Ariens sates ee ene eee 24, 
24. First antennal segment slender, not or scarcely swollen, about three times as long as 
wide at apex as seen from above; basal division of third segment slender or elongate- 
2D: 
First antennal segment short or more or less distinctly swollen, about twice as long as 
wide at apex or very little more as seen from above...........-...-2+-essee0e- 27. 
. Frons rather narrow, over one and one-half times as long as wide at vertex and distinctly 
narrowed above; with a long, semi-elliptical, black, basal callosity which is far re- 
moved from the eyes; and with two large, velvety, lateral spots and one minute, vel- 
vety dot in the middle of the vertex. Basal division of third antennal segment about 
as long as the first segment, much wider near the base than at the apex. Apical 
clear streak of wing not reaching hind margin. Abdominal gray spots small. 
Benethe Oto 10: mim, s+ sais Age. Beales eee Lhe ee kes ee ee H. angustifrons. 
Frons broader, less than one and one-half times as long as wide at vertex; the basal 
callosity paler and transverse. Abdominal gray spots large...............-...-- 26. 
. Frons slightly longer than wide at vertex, where it is very little narrower than above the 
antennae; with only two large, rounded, velvety, lateral spots; basal callosity long, 
extending over the lower third of the frons, widened in the middle, very broadly 
touching the eyes on the sides. Basal division of third antennal segment longer 
than the first segment, slender and of almost uniform width throughout. Apical 
clear streak of wing reaching close to the hind margin. The basal ring of the hind 
tibiae much wider than the apical one. Length, 10 mm................ H. dwvisapex. 
Frons about as long as wide at vertex, where it is very little narrower than above the 
antennae; with two large, velvety, lateral spots and often with a median, black dot at 
the vertex; basal callosity short, covering about the lower fourth of the frons and 
notched in the middle by an extension of the gray pollinosity of the frons, rather 
narrowly touching the eyes in the lower corners. Basal division of third segment 
about as long as the first segment, slender, but much wider near the base than at the 
apex. Apical clear streak of wing not reaching hind margin. The two pale rings of 
the tibiae of about equal width. Length,9mm...................... H. stimulans. 
. Basal division of third antennal segment much widened, disciform, less than twice as long 
ER SCs 8 alate wince ict ha WC Bans ans aja! 21a iin wipe 00 oh NR ee Se ks a 28. 
Basal division of third antennal segment elongate-ovate, at least twice as long as its great- 
BEN WNL LU. crn ca Nice Abc re6 Gk nS o:0, 5 Sahee Symons as Spee im em, eR ls ee a ae 30, 
First antennal segment large and swollen throughout, a little over one and one-half times 
as long as wide in profile; both the upper and lower apices of the second segment 
strongly produced; third segment conspicuously flattened throughout, the basal di- 
vision about as long as the first segment, the second and third divisions more than 
twice as wide as long. Large, dark clove-brown to black species; the abdomen 
without distinct lateral spots. Wing strongly infuscated, with conspicuous clear 
markings forming distinct rosettes. Length, 9.5 to 11.5 mm.............. H. harpax. 
First antennal segment small, more swollen toward the apex; only the upper apex of the 
second segment slightly produced; basal division only of the third segment conspicu- 
ously flattened, the second and third divisions not twice as wide as long. Smaller 
pile Goldvedepecisse ve ery Focune Jt 3s 1d eee an ee ite mR re "99, 
