586 SEREICORNIA. 



punctate, with intermixed slightly coarser punctures, obsoletely canaliculate, broadly transversely depressed 

 on the disc before the apex and also transversely depressed before the base. Scutellum densely, minutely 

 punctate. Elytra very much wider than the prothorax, elongate, widening to beyond the middle, and 

 conjointly rounded at the apex, constricted at the base, with the humeri prominent and rounded ; each 

 with five oblique raised costse, the inner one abbreviated behind and connected posteriorly with the raised 

 suture by three transverse raised lines, the outer two indistinct, the interspaces very coarsely and closely 

 subseriate-punctate, the first and second with two rows of punctures only. Beneath densely, minutely 

 punctate. Legs moderately stout, the tibiae strongly dilated externally at the apex, the tarsal joints 2-4 

 very deeply emarginate, the lamellae long. 

 Length 14|, breadth 6 millim. 



Hab. Mexico, Ventanas in Dnrango {Edge). 



One somewhat abraded male example. Differs from S. nietoi in the narrow, conical 

 thorax, the longer and much more coarsely punctured elytra, with more prominent 

 costse, and the longer and more slender legs. The elytra resemble those of the females 

 of S. nietoi in shape. S. conicicollis is allied to the North- American S. niger, Knoch 

 (= knochi, Guer.) ; but, to judge from the description, it appears to differ from that 

 species in having the head more finely punctured, and the larger punctures on the thorax 

 less distinct, these being not much coarser than the others. If Guerin's figure (Spec, 

 et Icon. livr. i. no. 2, tab. fig. 13) of the male of S. knochi is correct, the present insect 

 has the elytra much more coarsely and less densely punctate. 



Fam. DASCILLIM]*. 



Subfam. ABTEMATOPINJE. 



ARTEMATOPUS. 



Artematopus, Perty, Del. Anim. art. Brasil. p. 115 (1830); Lacordaire, Gen. Col. iv. p. 261. 

 Lairus, Castelnau, Hist. Nat. Ins. Col. i. p. 258 (1840). 



This peculiar genus is confined to Tropical America, ranging as far north as 

 Nicaragua. Twenty species have been described, all from south of the Isthmus of 

 Panama. Eight are now recorded from within our limits. The South-American 

 forms, of which there are many unnamed in collections, need a thorough revision, 

 the sexual characters of many of the described species not having been properly 

 understood. Lacordaire, too, quite overlooked the form of the tarsal lamella?, joints 

 2-4 having each two long lamellae (not one large one) beneath, as in the genus 

 Sandalus. The Central-American forms belong to two well-defined groups : one with 

 the antennas moderately long, and with the third joint about twice as long as the 

 second, in both sexes ; the other with the antennas as long as, or longer than, the 

 body, and the third joint very small, in the males, and moderately long, and with the 

 third joint much longer than the second, in the females. The antennas also differ in 



* By G. C. Champion. 



