CERAMBYCID^E 363 



tumido-angulate at apex. Length (9) 12.2 mm.; width 2.8 mm. 

 Mexico (Durango City), YVickham *vitticollis n. sp. 



Ruficollis is of a common Mexican type and a number of allied 

 species have been described by Bates and others, such as laticeps 

 and mexicana of Bates and rotundicollis of Thomson, but I fail to 

 find any description very well fitting mtticollis as above defined. 

 Horn did not mention the dense f ulvo-sericeous vestiture toward the 

 sides of the last three ventral segments of the male in ruficollis, 

 but it is described by Bates in the Mexican species. Vitticollis 

 may be among the forms confused with ruficollis by Horn, but I 

 have not seen his material; it is, at any rate, widely different from 

 that species in the punctuation of the head, in the coloration and 

 sculpture of the prothorax, in the shorter and less numerous erect 

 hairs of the pronotum, less coarse elytral punctures and evident 

 inner, as well as still much stronger outer, of the raised discal lines 

 of the elytra; these divergencies are mostly of an asexual nature. 



Amillarus Thorns. 



This neotropical genus is introduced merely to announce a pe- 

 culiar form, which I have had undetermined in my collection for 

 many years, having very slender antennae and long elytral spines; 

 it may be described as follows: 



*Amillarus tenuicornis n. sp. Form very slender, moderately convex, 

 black throughout, the entire legs and all the antennae excepting the scape 

 dull but pale testaceous, the scape deep black; pubescence above not 

 dense and consisting of extremely minute appressed cinereo-fuscous 

 hairs, condensed in three feeble vittae on the prothorax, longer and denser 

 beneath, albo-subvittate at the sides of the metasternum and along the 

 posterior part of the met-episterna; erect hairs everywhere wanting; 

 head as wide as the prothorax, with very convex eyes, which are unequally 

 bilobed, finely faceted and widely separated; antennae long and very 

 slender, filiform, fully three-fourths longer than the body, subglabrous, 

 sparsely fringed beneath, the scape slender, extending to the base of the 

 prothorax, the third joint very long, half as long as the elytra and nearly a 

 third longer than the scape, three to eight diminishing gradually in 

 length; prothorax slightly transverse, bitruncate, slightly narrower at 

 base than at apex, the sides feebly swollen and subprominent at the middle; 

 surface subevenly cylindric, alutaceous, strongly but not very coarsely, 

 loosely punctate; scutellum semicircular and having dense pale pubescence 

 contrasting much with the blackish general surface of the elytra, the latter 

 much wider than the prothorax, with rather angulate humeri, subparallel, 

 the sides gradually converging and arcuate posteriorly to the very acute 



