Wasps of the Genus Tachytes. 19 
at the apex; spur of hind tibia as long as the basal joint of 
the hind tarsus. Third cubital cell on the cubitus reaching 
beyond the radial cell, about three-quarters of the length of 
the second cubital cell. Second and third abscisse of the 
radius subequal. Second ventral segment subopaque, closely 
microscopically punctured. 
Hab. 8. Nigeria, Okigwi (J. J. Simpson), May. 
This species is nearly allied to T. hamiltoni, but has the 
galea much longer, fully three times as long as the scape in 
simulatriz, only a little more than twice as long in hamiltoni. 
As this character does not appear to differ in the sexes of 
other species, I do not think that these can be sexes of one 
species. 
17. Tachytes rhodesiana, Bisch. 
Tachytes rhodesianus, Bisch. Arch. f. Naturges. A. 3, p. 70 
(LOTS) Geo 
?. Very similar to 7. observabilis, but somewhat smaller, 
and may be distinguished at once by the clypeus, which is 
depressed on the apical margin, very shallowly subemarginate 
in the middle, with three well-defined teeth on each side. 
The distance between the eyes on the vertex is somewhat 
greater, slightly exceeding the length of the second joint of 
the flagellum. ‘lhe sculpture of the second ventral segment 
resembles that of odservabilis and basilica, but the minute 
punctures spread over the small triangular area in the 
middle of the apical margin. 
6. Clypeus as in the female. Eyes separated on the 
vertex by a distance not quite equal to the length of the 
second joint of the flagellum, much further apart than in 
observabilis and basilica. Seventh tergite broad, rather 
broadly subtruncate at the apex, eighth sternite very shal- 
lowly emarginate at the apex, the angles not forming 
distinct teeth. Fourth and fifth joints of the flagellum 
subarcuate beneath. 
Length, 9? 17 mm., ¢ 16 mm. 
Hab. 8. Rhodesia, Springvale (Rhodesia Museum), April ; 
Zululand, Mfongosi (W. E. Jones, 8. African Museum), 
April, g 2. 
The labial palpi in this species are much shorter and 
stouter than in others of the group, the basal joint being 
much shorter than the second joint of the flagellum, not 
longer as in odservabilis and other related species. 
Q* 
