8 MONOPLATUS. 



Although of the preceding species (M. nigripes and Presidendce} 

 I have only been able to examine females, and of this species 

 only males, I have, after much examination, no doubt that they are 

 abundantly distinct the one from the other. M. distinguendus may 

 be known (irrespective of its different coloration, especially the flavous 

 margination of the elytra) by its manifestly less deep striation on the 

 elytra ; sometimes this is almost imperceptible, except under a high 

 power. There is also abundant distinguishing character in the mark- 

 ings on the head. 



4. Monoplatus Grayii. (FRONT, fig. 1.) 



M. oblongo-ovalis, subdepressus, parallelus, niger, nitidus ; capite 

 brevi, subdepresso, hand elongato, inter oculos longitudinaliter 

 foveolato, fusco-bimaculato ad basin, inter oculos; thorace trans- 

 verso, rectangulari, angulis anticis subacutisprominulis, ad latera 

 marginato, ad basin fovea transversa haud latera attingit, im- 

 punctato, fusco ; elytris subparallelis, punctato-striatis, sutura, 

 marginibus, fasciisque duabus transversis (interdum etiam ely- 

 trorum basi)flavis; antennispiceis, ad basin flavis; pedibus flavis. 



c? Long. corp. 3 lin., lat. 1 lin. 



Oblong-oval, subdepressed, parallel, black, shining. Head very 

 small, not elongated; eyes large, distant, prominent, reaching laterally 

 nearly as far as the apical angle of the thorax ; between the eyes, 

 above the insertion of the antennae, is a small obsolete longitudinal 

 impression ; the surface impunctate ; near the inner and posterior 

 margin of the eyes are two subcircular obsolete fuscous spots. Thorax 

 transverse, rectangular, in front very slightly emarginate ; the an- 

 terior angles are subacute and depressed ; the sides marginate, most 

 distinctly anteriorly ; at the base is a transverse linear fovea, nearly 

 parallel to the margin, which does not extend to the lateral margi- 

 nation, but is abruptly deflected to the base ; surface impunctate, 

 flavous. Scutellum triangular, impunctate, shining. Elytra parallel, 

 somewhat depressed, punctate-striate, black ; the lateral margination 

 (which is distinct) and the suture (except as either approaches the 

 base) are flavous: two transverse regularly formed fasciae of the 

 same colour are situated, the one medially (which is slightly deflected 

 towards the base as it approaches the margination), the other nearer 

 to the base, at the distance from the former of its own breadth : in 

 some examples the apex also is flavous. Antenna} filiform, as long as 

 the elytra, the joints being severally of the form of those of allied 

 species ; first to fourth flavous, the rest fuscous or piceous. 



The above description is from a male. Although several examples 



