30< 



31 



32 



33- 



34- 



35- 



" €8 Memoirs of the Indian Museum. [Vol, VII, 



The central tubercle erect, more or less columnar, broadly 



rounded above .. .. .. .. p. occipitalis, p. 61. 



The central tubercle decumbent throughout, with slender free 



a P ex • • • • . . . . . . P. nasutus, p. 62. 



The epipleura densely hairy . . . . . . . . . , 32. 



The epipleura hairless . . . . . . . . . . . . 36, 



The general surface glossy ; the punctures in the lateral grooves 



of the elytra coarse but scarcely transverse . . . . . . . . 33. 



The general surface quite dull ; the punctures in the lateral 



grooves of the elytra very coarse, more or less transverse . P. opacus, p. 63. 

 The frontal area less than twice as broad as long ; the central 



tubercle without free apex . . . . . . P. toriferus, p. 62. 



The frontal area more than twice as broad as long ; or the 



central tubercle with free apex . . . . . . . . . . 34. 



The central tubercle with long and slender free apex . . . . . . 35. 



The central tubercle not extensively free . . . . P. interruptus, p. 63. 



The eighth ribs of the elytra hairless and unpunctured 



throughout .. .. .. .. ..P. punctatissimus, p. 62. 



The eighth ribs of the elytra punctured and hairy, especially 



in front . . . . . . . . . . P. unicornis, p. 63. 



( The frontal area more than twice as broad as long ... P. glaber, p. 61. 



) The frontal area less than twice as broad as long . . . . . . 37 . 



r The frontal area not grooved in continuation of the median 



concavity between the secondary tubercles on the anterior 



margin . . . . . . . . . . P. binominatus, p. 64. 



) The frontal area grooved medially in front, in continuation 



with the concavity between the secondary tubercles on the 



anterior margin . . . . . . . . P. erosus, p. 64 . 



Genus PTICHOPUS, Kaup, 1869, p. 27. 

 Type, Passalus angulatus, Percheron, 1835, pp. 84-86, pi. vi, fig. 5. 



Ptichopus angulatus (Percheron). 

 Passalus angulatus, Percheron, 1835, pp. 84-86, pi. vi, fig. 5. 

 Several specimens from Mexico, Guatemala, Honduras (San Pedro Sula), and Nicaragua. 

 Length 24-35 mm - These specimens show the species to be a somewhat variable one, 

 even in the characters used by Kuwert to distinguish others from it ; and the validity 

 of species thus distinguished seems very doubtful. The generic definition, therefore will 

 probably suffice for the identification of the present form, which is very unlike any other 

 Passalid known to me. 



Subfamily SOLENOCYCLINAE. 



The characteristics of this subfamily have been discussed and defined above (pp. 10-13). 



Specimens from Madagascar are characterized by the presence of a pair of. more or 



Jess pronounced marginal tubercles immediately on the inner side of the fronto-vertical 



