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 reachinsr 

 beyond the radial cell, about three-quarters of the length of 

 the second cubital cell. Second and third abscissae of the 

 radius subequal. Second ventral segment subopaque, closely 

 microscopically punctured. 



Hab. S. 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 iu 

 simulatrix, 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 

 (1913). $. 



? . Very similar to T. ohservabilis, but somewhat smaller, 

 and may be distinguished at once by the clypeus, which is 

 depressed on the apical margin, very shallowly subemargiuate 

 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. The sculpture of the second ventral segment 

 resembles that of observabilis and basilica, but the minute 

 punctures spread over the small triangular area in the 

 middle of the apical margin. 



cJ . 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, ? 17 mm., $ 16 mm. 



Hab. S. Rhodesia, Springvale [Rhodesia Museum), April ; 

 Zulaland, Mfongosi {IV. E. Jones, S. African Museum), 

 April, (? ? . 



The labial palpi in this species are much shorter and 

 stouter than iu others of the group, the basal joint being 

 much shorter than the second joint of the flagellum, not 

 longer as in observabilis and other related species. 



2* 



