36 MR. G. A. K. MARSHALL ON COLEOPTERA [Jan. 19, 



sides not much rounded, broadest before middle, dorsal anterior 

 margin truncate, ocular lobes well developed. Upper surface 

 convex, very closely set with low rounded tubercles, without any 

 central furrow ; tubercles unipunctate, bare and without setse, the 

 interstices with scattered large round white scales, which are 

 denser laterally and along a narrow central line. Elytra very broadly 

 ovate, shoulders with a strong tubercular prominence projecting 

 forwards, sides strongly rounded, broadest rather behind middle, 

 apical prominences very short and obtuse in $ . Upper surface 

 convex, the sulci with rows of subreticulated foveolse separated by 

 transversely- elongated granules and disappearing near apex ; all 

 intervals evenly raised, except for an obtuse prominence on the 

 declivity of 3, each with a row of small rounded tubercles, but 

 those on intervals 1 and 2 are usually almost obliterated ; tubercles 

 bare and with minute black setae, the sulci containing elongate 

 patches of large round white scales, which are denser towards the 

 sides. Legs short and stout, very rugosely foveate, and with a 

 few scattered white scales ; all the tibiae with their interior edges 

 strongly dentate ; posterior tarsi with the joints subequal in 

 length and breadth. 



Cape Colony : Namaqualand {L. Peringuey). 



Type in the Stockholm Museum. 



Of this species Mr. Peringuey writes : — " I found this insect on 

 a bush [Hhus sp.), with the black, white-spotted bai-k of which its 

 colour harmonises so well ; moreover, it always rests in the fork 

 of a branch, where so closely does it resemble a knob of wood that 

 I discovered it by mere chance. So well does it assimilate with 

 its surroundings that I had to examine each branch of this Rhus, 

 which was by no means plentiful, in order to obtain four or five 

 specimens. So far from letting themselves fall when touched, 

 these beetles clung tightly to the branches, and I could only 

 detach them with difiiculty. The curvature and toothing of the 

 tibiae were thus explained. ' The protective assimilation of this 

 insect to its environment is one of the most striking cases that I 

 have yet seen among South- African beetles." 



18. H. JANUS Mshl. (Plate I. fig. 3.) 



H.jamis Mshl. 1. c. p. 439 (1902). 



Long. 19 (with apical spines, 20), lat. 85^ mm. 



Head convex, with scattered shallow punctures on vertex, much 

 deeper and coarser on forehead, which is retuse and has a short 

 central carina ; anteocular furrows deep. Rostrum cut ofi" from 

 head by a deep dorsal incision, as long as prothorax only, scarcely 

 curved, subparallel for two-thirds of its length, thence dilated to 

 apex. Upper surface convex, with five narrow and undulating 

 carinae, the central one being higher and rather shorter than the 

 others ; latei'al sulci broad and deep, the lower pair longer, the 

 upper pair meeting at base ; scrobes sublateral, extending almost 

 beneath the base of rostrum ; inferior basal furrow deep. 

 AntenivB with scape just reaching eye ; the two basal joints of 



