160 Mr. G. J. Arrow on the 



commonest of the species mentioned by him, H. daudms, 

 King, which, in my opinion, is the earlier described H. meles, 

 Billij. A small, but peculiar, feature of this species is 

 worthy of mention. The sexes of the Dynastinse (and 

 Rntelinse) are almost invariably distinguishable by the form 

 of the last ventral segment, which in the female is longer 

 and more pointed behind than in the male. In the latter 

 the apical part appears to be excised and replaced by a 

 shining quasi-transparent membrane. In the male of 

 Heteroligus meles this segment is narrow and the terminal 

 membrane is broad and conspicuous. In the female, con- 

 trary to the usual condition, there is also an apical excision 

 and membranous filling, but the excision is much narrower 

 than in the male and its form is very curious, a bilobed 

 process from the middle of its edge dividing it into two 

 parts, which are fringed with stiff hairs. 



This species is common in Sierra Leone and Nigeria, and 

 extends eastwards as far as Uganda. Mr. Peringuey has 

 described under its name {H. claudius, Klug) a form from 

 Damaraland, but, as shown by the figure of its oedeagus^ that 

 is another species. It appears to be different from H. brevis 

 and geotrupinus of Quedenfeldt, both of which are con- 

 siderably smaller. It must therefore be renamed, and I 

 propose to call it H. peringueyi. 



The following is very closely related, but again distinct : — 



Heteroligus gazanus, sp. n. 



Piceus, subtus parce rufo-hirtus, ovatus, crassus, capite OTunino 

 rnguloso, tiiberculis duo frontalibus distantibus, clypeo modica 

 angustato, antice arcuate, prothorace undique crebre punctate, 

 disco subtilius, tuberculis duo gomiuatis paulo ante marginem 

 anticura ; scutello paulo irregulariter punctulato ; elytris crebre 

 irregulariter punctatis, liueisquatuor indistinctis duplicis striaque 

 suturali profunda, propygidio parum subtiliter transverse striate, 

 pygidio parce subtilissime punctulato, angulis anticis crebro 

 rugulosis : 



^ segmento ultimo ventrali brevi, late membranaceo : 



5 , segmento ultimo ventrali longiori, apice anguste et simplicG 

 emarginato. 



Long. 32-35 mm. ; lat. max. 19 mm. 



Hab. Gazaland : Chirinda. 



A pair has been presented by Mr. G. A. K. Marshall. This 

 species has the closest possible resemblance to H. meles, 

 from which the sexual characters referred to distinguish it 

 most surely. The elytra are rather more coarsely and 

 irregularly punctured and the smooth longitudinal lines 



