854 REPORT OF THE HARVARD AFRICAN EXPEDITION 
basitarsus is bright white or yellowish white with broad black apex and narrow 
black base, and is produced apically into a distinct lobe; the following segment 
is much narrower, with a deep dorsal incision at base and a basal scale-like proc- 
ess, its extreme base dirty yellowish. Some additional characters are as follows: 
Claws with a sharp tooth near the base. Antennae of eleven segments, black 
with the first two segments and part of the third reddish yellow. Pleura with- 
out a patch of soft hair near the spiracle. First longitudinal vein (radius) ending 
on the costa beyond the middle of the wing, with fine setulae over its entire 
length, its stem vein with pale hairs. Third longitudinal vein (radial sector) 
simple. The best description of the female has been given by Roubaud (1906), 
while Pomeroy (1920) has described the male and figured the genitalia of that 
sex. 
I am inclined to regard Edwardsellum cingulatum Enderlein (1922, Sitzungs- 
ber. Ges. Naturf. Fr. Berlin (1921), p. 80; 9; Khartoum, Anglo-Egyptian Sudan) 
as not specifically distinct from H. damnosum. The only difference which I can 
discover between my specimens and the description of EH. cingulatwm is in the 
color of the antennae, which Enderlein describes for his species as follows: ‘ Fuh- 
ler ockergelb, Geissel mit grauen Reif.’ 
The second Congo species, Husimulium dentulosum (Roubaud), agrees with 
E. damnosum in many of the characters mentioned above. It is, nevertheless, 
readily distinguished by the shape of the fore tarsi, which are long and slender 
throughout, by the color of the legs, which are extensively honey-yellow over the 
femora and tibiae, and by the patch of black pile on the stem vein of the radius. 
The peculiarities of the wing place both H. damnosum and E. dentulosum in 
the genus Husimulium Roubaud, as defined again by Dyar and Shannon (1927, 
Proc. U. 8. Nat. Mus., LXIX, Art. 10, p. 12). These authors use as a generic 
character the presence of pilosity over the entire length of the radius in EHusi- 
mulium, whereas in Simulium, proper, the radius is bare between the stem vein 
and the branching off of the radial sector, which in both genera is simple. I am 
somewhat doubtful as to the generic value of so slight a difference. In H. den- 
tulosum the pilosity of the radius is abundant but short throughout. In #£. 
damnosum, however, the basal stretch of this vein (beyond the stem vein) bears 
only a few short hairs which, although readily seen under the microscope, could 
hardly be made out with a hand-lens. 
In attempting to place these two species in Enderlein’s recent classification 
of the Simuliidae,” one finds that H. dentulosum would fall in the ‘‘tribe Never- 
manniini’’ and most probably in the genus Friesea Enderlein (1922). On the 
other hand, #. damnosum should be placed in the ‘‘tribe Simuliini,’’ where 
Enderlein made it the type of a distinct genus, Hdwardsellum Enderlein (1921), 
characterized mainly by the sharp tooth close to the base of the tarsal claw and 
1 These remarks are based upon a study of five paratypes of EH. dentulosum. 
2 Enderlein, G. 1921. ‘Das System der Kriebelmiicken (Simuliidae).’ Deutsche Tieriirtzl. Wochen- 
schr., X XIX, (April), pp. 197-200. 
1921. ‘Die systematische Gliederung der Simuliiden.’ Zoolog. Anzeiger, LIII, (June), pp. 43-46. 
1922. ‘Neue Beitriige zur Kenntnis der Simuliiden.’ Konowia, I, pp. 67-76. 
1925. ‘Weitere Beitrage zur Kenntnis der Simuliiden und ihrer Verbreitung.’ Zoolog. Anzeiger, 
LXII, pp. 201-211. 
