1940] 
The Genus Echestypus 
101 
Hinterrande so tief ausgebuchtet, dass es nur aus zwei 
zungenformigen, vorne in ihrer eigenen Breite zusammen- 
hangenden, divergierenden Lappen besteht. Sonst ist die 
Ventralflache gleichmassig beborstet und nur vor der Geni- 
taloffnung ein wenig derber braunlich chitinisiert.” 
3. Echestypus binoculus Speiser. Fig. 4. 
Echestypus binoculus Speiser, 1908, Denkschr. Med.- 
Naturw. Ges. Jena, XIII, pt. 1, p. 176, fig. ( 2 $ ; Kalahari; 
off Raphicerus campestris) . Bezzi, 1916, Natura, Riv. Sc. 
Nat., VII, p. 178. Bedford, 1932, 18th Rept. Div. Vet. Serv. 
An. Ind. South Africa, p. 420. 
Echestypus binoculatus “Speiser” Aldrich, 1923, Insecu- 
tor Inscit. Menstr., XI, p. 77 (error for binoculus ) . 
Previous Records. — Kalahari : Without more definite 
locality, off Raphicerus campestris , types. — Cape Province : 
Middelburg, off Antidorcas marsupialis (Bedford, 1932). 
Specimen Examined. — Orange Free State : Hoopstad 
District, one female, off Raphicerus campestris (R. du Toit) . 
Host Relationships. — The few specimens known were 
taken from steinbok, Raphicerus campestris (Thunberg) 
and springbok, Antidorcas marsupialis (Zimmermann) , 
both small South African antelopes. Antidorcas reaches 
southern Angola, while Raphicerus extends farther north in 
East Africa, to northern Tanganyika Territory. 
Distribution. — This rare species is known only from the 
Kalahari, the western Orange Free State and the west- 
central part of Cape Province. When steinbok and spring- 
bok are more carefully examined, the range of the parasite 
will no doubt be extended. 
Synonymy. — E. binoculus was described from two males 
and five females, from the Kalahari. I have not seen the 
types and I do not know where they have been deposited. 
The species is, however, easily recognized from the original 
description and figure. 
Characters. — I have only seen one female, received 
through the kindness of Dr. R. du Toit. The characters 
given in the key are taken from this specimen. In addition, 
it may be noted that the chetotaxy is more reduced than in 
either of the other species: there is only one pair of apical 
