Annals of the Transvaal Museum 247 
3. Sternocoxal plate (maxillary sternite) provided with distinct prosternal 
dentiferous plates. The pleurae end in a process with spines. Tergites 
not provided with broad elevated ridges and deep impressions, they 
are smooth and bisulcate. Sternites bisulcate or without sulci. Only 
first three or first four segments of antennae are naked ... 4 
4. Femur of maxillipede provided with well-developed basal tooth ex- 
tending beyond the prosternal plates. Generally the first three (very 
seldom the first four) segments of antennae naked. Stigmata deep- 
ened, surrounded by a prominent wall that inclines to the inside, the 
stigmata wall seldom flattened ..... Rhysida Wood 
Femur of maxillipede not provided with a basal tooth extending beyond 
the prosternal plates, at most a dwindling rugosity is present. Only 
first four segments of antennae are naked. Sitgmata large, the first 
is exceptionally large, they are flat-bottomed. The pleurae usually 
end in a long process ...... Ethmostigmus Pocock 
Genus ALIPES Imhoff. 
(See figs, i and 2.) 
Alipes crotalus Gerst. Antennae 17 segments, 2.\ basal segments naked. The 
two longitudinal and the median carinations of the tergites begin on the third 
somite with broad shallow ridges richly covered with fine, short, hairy setae. 
Marginations begin from the fifth or sixth tergite. Lateral depressions are 
partly developed, densely and finely punctured. The carinations are densely 
t x = proximal tarsus; / 2 = distal tarsus. 
punctured and finely granulated ; anal tergite finely punctured with a distinct 
median depression. Sternocoxal plate (maxillary sternite) sparsely punctured, 
with abbreviated anterior sulcus; prosternal plates about as long as broad, 
each bearing four teeth. The sternites are smooth, without median sulci, but 
often with two lateral depressions and on the posterior edge a median depres- 
sion; anal sternite abbreviated, posterior margin rounded. Posterior margin 
of pleurae curved, almost rectangular. Femur of anal legs coarsely punctured 
dorsally, without a basal process or tooth-like prominence; tibia a little longer 
than the breadth (measured from point to point) of the posterior margin ; first 
tarsus about £ broader than the posterior margin of tibia (5-5 : 4-5 mm.), 1 J 
times as long as broad, studded with flattened oval rugosities. Colour yellowish 
brown to reddish brown; the head-plate often redder. Length up to 64 mm. 
with breadth 5 mm. 
