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



are subgranulate and closely cinereo-pubescent ; the pro- 

 thorax is transverse, rounded-siibquadrate, with the re- 

 flexed margins feebly notched behind the middle ; and 

 one of the claws of each foot is angularly dilated at the 

 base. P. megalophthalmus, from Durango, is not unlike 

 P. longicornis, but it has very large eyes, a longer pro- 

 thorax, and still more elongate, serrate antennae, in the 

 male, the scutellum yellow, etc. 



24. Polemius albimargo, n. sp. 



(^. Moderately elongate, very shining, sparsely pubescent; nigro- 

 piceoiis, the anterior margin of the head, the mandibles, antennae, 

 prothorax, scutellum, coxae, and legs (the base of the posterior 

 femora excepted), testaceous, the sutural and lateral margins of the 

 elytra whitish. Head together with the enormously developed eyes 

 wider than the prothorax, smooth, hollowed in the middle ; antennae 

 slender, as long as the body, joints 3-7 elongate (8-11 missing), 

 2 very small. Prothorax broad, transversely subquadrate, with 

 narrowly reflexed margins, which are dilated into a rather broad, 

 prominent, subangular tooth beyond the middle (appearing obliquely 

 convergent thence to the apex) and gradually widened posteriorly 

 to the subrectangular hind angles. Elytra considerably wider than 

 the prothorax, moderately long, subparallel, rather sparsely, finely 

 punctate. 



Length (excl. head) 4f , breadth 2 mm. 



Hab. Costa Kica {Mus. Brit., ex coll. Fry). 



One male, with the legs and antennae imperfect. A 

 remarkably distinct form, having the general facies of 

 Silis ocularis, Grorh., and the elytral coloration and sculpture 

 of Silis jocosa ; the prothorax, however, is very differently 

 shaped from that of the male of either of these species. 

 P. albimargo approaches P. (Silis) amicula, Gorh. {<^), 

 but it is broader, the eyes are still larger, the antennae 

 are longer and wholly testaceous, and the lateral promi- 

 nence of the prothorax is wider and not followed by an 

 oblique plica. 



25. Polemius amicula. 



Silis amicula, Gorh., Biol. Centr.-Am., Coleopt. iii, 2, p. 299 



(J. Eyes enormously developed ; prothorax subquadrate, arcuate 

 at the apex, narrowly margined laterally, the margins obliquely 



