74 Memoirs of the Indian Museum. [Vol. VII, 



Pentalobus fur (Kuwert). 

 Didimus duplicates ab. fur, Kuwert, 1898. p. 307. 



Three specimens from Abetefi, Ashanti. Length 2 1-23 mm. 



It is possible that this form, which Kuwert regarded as an aberration of P. dwplicatus 

 (Har.) may be no more than a variety of P. parastictus. It differs from the latter only in 

 being without punctures in the posterior angles of the pronotum, in having the punctured 

 area on the central area of the metasternum less strongly marked, in having the punctures 

 of the seventh and eighth grooves of the elytra weaker and less distinctly transverse, and 

 in having the posterior angles of the elytra polished instead of matt. These are much 

 i;he same characters as those by which Kuwert distinguishes this form from the form 

 ^vvhich he regards as the typical duplicatus, a species which I have not seen. 



The above-mentioned species of Pentalobus may be distinguished as follows : — 



\ The anterior margin of the head with a strong median tubercle . . . . 2. 



( The anterior margin of the head medially concave . . . . . . 3. 



f The posterior intermediate areas of the metasternun unpunc- 



2 < tured . . . . . . . . . . P. Mugi, p. 72. 



( The posterior intermediate areas strongly punctured . . P. sansibaricus, p. 73. 

 ( The anterior margin of the head with a strong median concavity 



bounded by a pair of strong secondary tubercles . . . . . . . 4. 



The anterior margin of the head with a faint median concavity 



not bounded by definite tubercles . . . . . . . . . . 5. 



Antennae each with three moderately stout lamellae . . P. punctipectis, p. 73. 



Antennae each with five long and slender lamellae . . P. barbatus, p. 73. 

 Elytral grooves 7-8 strongly marked with transverse punctures, 



the posterior angles of the elytra matt . . . . P. parastictus, p. 73. 



Elytral grooves 7-8 more faintly punctured, the posterior 



angles of the elytra glossy . . . . . . P. fur, p. 74. 



Genus, ERIONOMUS, Kaup, 1868a, pp. 16-17. 

 Inch Calidas+Epeus+Eriosternus, Kuwert, 1896. 

 Type, Passalus planiceps, Eschscholtz, 1829, pp. 22-23. 



Erionomus palini (Percheron). 

 Passalus palinii, Percheron 1844, pp. 8-9, pi. cxxxv, fig. 1. 



A number of specimens from Abetefi, Ashanti, and two from Gaboon. Length 

 ^4-5-38-0 mm. 



This species superficially resembles Pentalobus barbatus. The antennae have, however, 

 only four lamellae ; the anterior margin of the head is approximately straight in the middle ; 

 the puncturing of the sides of the prothorax is somewhat less extensive ; the lateral areas 

 of the metasternum are hairy ; and the punctures of the lateral grooves of the elytra, 

 though very strong, are not transverse. 



