1918.] F. H. Gravely : Passalidae of the World. 7S 



Pentalobus sansibaricus (Harold). 



Passalus sansibaricus, Harold, 1880, pp. 262-263. 



Five specimens from Zanzibar, one from Abyssinia, one from Abetefi, one from 

 Rkombomp (Sierra Leone), a number from Dar-es-Salaam, and six said to come from 

 Bolivia. Length 16*5-27 "5 mm. 



P. sansibaricus differs from P. Mugi only in having the antennal lamellae somewhat 

 longer, in having the upper surface of the head thickly punctured more or less all over, in 

 having the mesosternum smooth and polished, with well defined scars, and in having the 

 posterior intermediate areas of the metasternum coarsely punctured. The central plate of 

 the metasternum is lightly and sparsely punctured in small specimens. 



Pentalobus punctipectus (Kaup). 

 Fig. VIII, 3. p. 70. 

 Leptaulax punctipectus, Kaup, 1868«, p. 11. 



One specimen from Gaboon. Length 18 mm. 



This species differs from small specimens of the last in having a median pair of secondary 

 marginal tubercles instead of a single median tubercle, and in having the central plate of 

 the metasternum less sparsely covered with stronger punctures. 



Pentalobus barbatus (Fabricius). 



Passalus barbatus, Fabricius, 1801, p. 256. 



A large number of specimens from Abetefi, Ashanti ; also a few from Amu, Ashanti ; 

 Gaboon ; Old Calabar ; Aquapim, Guinea ; Barombi, Cameroons ; and Angola ; all 23-29 

 mm. long. Also one specimen from East Africa, 20 mm. long, and two from Franceville, 

 French Congo, 17-19 mm. long, between which and the larger forms I am unable to find 

 any structural difference. 



This species differs from P. punctipectis in having five antennal lamellae, all of them 

 very long and slender ; and in having the central area of the metasternum unpunctured. 



Pentalobus parastictus (Imhoff). 



Passalus parastictus, Imhoff, 1843, pp. 171-172. 



One specimen from Aquapim, Guinea, and one from Barombi, Cameroons Interior. 

 Length 21-24 mm - 



The punctures on the head are somewhat shallow, and the anterior margin of the head 

 is lightly exavate medially, but has no median tubercles. The punctures on the central 

 area of the metasternum are more or less concentrated beside the posterior margin. The 

 transverse punctures of the lateral grooves of the elytra are more or less obsolete in the two 

 outermost of these grooves, and all the grooves except the fifth and sixth tend to unite in 

 a matt depression behind. In other respects this species resembles P. punctipectis. 



