A Bevision of the Genus Synthocus. 97 



Prothorax longer than the width at base, but shorter than the 

 greatest width, the sides sharply angulated behind middle, strongly 

 narrowed towards apex, less strongly towards the base, which is sub- 

 truncate ; upper surface convex posteriorly, with large coarse punc- 

 tures and a distinct central furrow, transversely impressed near apex, 

 the impression containing an oblique fovea on each side of the 

 central furrow. Elytra oblong, basal margin subtruncate and not 

 broader than the base of the prothorax, shoulders roughly rectangular, 

 the sides subparallel from there to the declivity, which is very abrupt 

 and angulated dorsally; upper surface plane as far as the 4th interval, 

 then sloping sharply to the 6th, coarsely punctured in ill-defined rows, 

 the discal intervals rugose and subtuberculate ; interval 4 with a row 

 of conical tubercles ending at the declivity and almost parallel with 

 the suture, 6 with a similar row reaching the apex, 3 and 5 each 

 with a basal callus, and 2 with a row of small tubercles on the 

 declivity. Legs stout, with dense greyish brown scaling and black 

 setae; tibiae not scabrous, broad and subcompressed, inner apical 

 angle with a long curved spine, outer angle scarcely produced ; tarsi 

 short and stout. 



Little Namaqualand [Stockholm Mus.] . 



Type in the Stockholm Museum. 



Very similar in general facies to S. quadripennis, Per., from which 

 it may be distinguished by its much broader and sharply angulated 

 thorax, the absence of the anterior lateral carina on the thorax, the 

 much thicker and subcompressed tibi«, the long tibial spine, and 

 the much shorter tarsi. 



7. Synthocus quadripennis, P^r. 

 S. quadripemtis. Per., Trans. S. A. Phil. Soc, 1888, p. 165. 



Long llj- ; lat. 6 mm. 



Colour apparently uniform earthy-brown, but the specimen is 

 much rubbed dorsally. 



Prothorax a little longer than broad, sides rounded, broadest behind 

 middle, constricted anteriorly and slightly narrowed at the base, which 

 is truncate ; upper surface convex posteriorly, very rugosely scrobi- 

 culate throughout, with a distinct central furrow, transversely im- 

 pressed near apex and with a large fovea on each side of the central 

 furrow, the fovea being bounded externally by a curved carina which 

 extends from the apex to behind middle, where it terminates abruptly 

 in the form of a small vertical tubercle ; sides scrobiculate. Elytra 

 oblong, the basal margin subtruncate and slightly broader than the 

 base of the thorax, shoulders roundly prominent, sides subparallel 



7 



