76 Mr. G. C. Champion's Revision of the Mexican 



5. Polemius nigromarginatus, n. sp. (Plate III, fig. 8, ^.) 



Discodon cleroides, Gorh., Biol. Centr.-Am., Coleopt. iii, 

 2, p. 287 (?) {nee p. 84) (excl. var.). 



Rather broad, dull, clothed with fine blackish pubescence ; deep 

 black, with the base of the mandibles, and a sharply defined sinuate 

 submarginal stripe on each side of the prothorax (leaving a very large 

 triangular patch on the disc and the outer margins black), pale 

 flavous. Eyes somewhat prominent in c^. Antennae subserrate 

 and tapering towards the tip in $, a little longer and with joints 3-7 

 less widened in ^. Prothorax broad, transverse, widely explanate 

 laterally, the margins somewhat rounded, feebly sinuate, and with- 

 out trace of notch in (^, the hind angles obtuse. Elytra a little 

 wider than the prothorax, very feebly explanate in $, coriaceous, 

 subcostulate. Inner claw of anterior and outer claw of the other 

 tarsi broadly lobed in J'- 



cJ. Eighth ventral segment broad, sharply carinate down the 

 middle jjosteriorly ; ninth segment rather broad, parallel-sided, 

 abruptly, obliquely narrowed towards the apex, the extruded 

 fiagellum bent and sharjDly acuminate (fig. 29). 



Length (excl. head) 6j-9, breadth 2J-3^ mm. 



Hab. Mexico, Ciudad in Durango, 8100 ft. {Forrcr : $ ; 

 Hoge: ^ ^). 



The three females from Durango referred by Gorham 

 in his " Supplement" to Discodon cleroides belong to the 

 present species, of which a long series was subsequently 

 received from Hoge from the same locality. The females 

 of the two insects, it is true, are very similar, that of the 

 present species being recognisable by the wholly black 

 head, the rounded sides of the prothorax, and the less 

 dilated margins of the elytra. The males have a very 

 differently shaped prothorax, and the tarsal claws other- 

 wise formed. 



6. Polemius spissicornis, n. sp. (Plate VIII, fig. 59, 

 prothorax, (J.) 



Moderately elongate, rather broad, dull, finelj' pubescent; black, 

 the base of the mandibles and the prothorax (a broad patch on the 

 disc excepted) testaceous or flavo-testaceous. Head short; an- 

 tennae serrate, stout, about reaching the basal third of the elytra, 

 slightly tapering towards the tip. Prothorax ((^) very short, broad, 

 sulcate down the middle posteriorly, the lateral margins re flexed, 

 and narrowly, deeply, obliquely excised towards the base, appearing 



