ACAXTHOPHORU6. 23 



mandibles projecting forwards almost horizontally in both sexes. 

 The clypeus not coriaceous in front, but the suture between it 

 and the labrum distinct. The legs are smooth, and the third 

 tarsal joint is completely bilobed. The wing-venation in Acantho- 

 pliorus resembles that of Dori/stJienes and most Prionince, but in 

 Tithoes, its African representative, there is a cross-vein uniting 

 vein Cu. 2 with Cu. 1. 



Genus ACANTHOPHORUS. 



Acanthophorus, Sermlle, Ann. Soc. Ent. Fr. \, p. 152 (1832) ; Lacord. 

 Gen. Coleopt. viii, p. 69 (1869). 



Type, A. sermticornis, Oliv. 



Range. India, Southern Arabia, East and South Africa. 



c? . Head short, broad, oblique in front ; clypeus depressed in 

 the middle, slightly raised at the sides, bounded behind by an 

 arcuate groove ; the interocular space above it bounded on each 

 side by a more or less prominent supra-orbital ridge ; antenniferous 

 tubercles widely separated ; mandibles long, directed forwards, 

 carinate above, and either (1) curved almost from the base leaving 

 a narrow space between them in the middle when closed, or 

 (2) straight at the base, and incurved from the middle to the tip ; 

 in the first case armed each with three or four teeth beyond the 

 middle, in the second with a series of teeth along the inner edge. 

 Antennae shorter than the body, 11- or 12-jointed ; first joint 

 stout, scarcely longer than broad ; third three times as long as 

 the first ; the fifth and following joints, except the last, more or 

 less strongly toothed at the apex on the anterior side. Pronotum 

 strongly transverse, with three spines on each side, the second the 

 longest and placed a little before the middle. Elytra twice as 

 long as broad, rounded at the apex. Intercoxale of prosternum 

 nearly horizontal behind, narrowed towards the end, where it 

 rests on the mesosternum. Last ventral segment sinuate at the 

 apex. Legs moderately long ; femora stout, widest at or before 

 the middle ; tarsi rather broad, with the third joint deeply bilobed; 

 first joint of the front tarsus scarcely longer than the second, 

 that of the hind tarsus nearly as long as the second and third 

 united. 



$ . Mandibles shorter than those of the male and always 

 of the second male form. Antennae scarcely reaching beyond 

 the middle of the elytra. Last ventral segment rounded at 

 the apex. 



20. Acanthophorus serraticornis, Olio. (Prionus) Ent. iv, no. 66, 

 p. 14, pi. 9, fig. 33 (1795) ; Serville (Acanthophorus), Ann. Soc. 

 Ent. Fr. i, p. 153 (1832). 



c? . Reddish tawny in colour, with the head, the basal half of 

 the antenna) and the pronotum black or brownish-black. Head 



