14 Mr. H. W. Bates on the Longicorn Coleoptera 



thighs clavate ; tarsi undilated and simple in both sexes ; basal 

 joint of posterior tarsi as long as, or longer than, the three suc- 

 ceeding taken together. 



This genus is distinguished from all the preceding by the 

 cleft or deeply notched apex of the terminal ventral segment in 

 the females; in this it agrees with Graphisurus of Kirby*, 

 which, again, is connected by intermediate species with Acantho- 

 cinus, a group containing the well-known A. adilis, or carpenter- 

 beetle, an inhabitant of the wooded parts of our own island. 

 Thus all the numerous genera of Acanthocinitfe are closely linked 

 together; for species of Nyssodrys (e. g. N. signifera) exhibit to 

 a slight extent the character of a cleft apex of the terminal ven- 

 tral segment, and this genus leads on without any sharp line of 

 demarcation to Leiopus, — showing that the European genera 

 Leiopus and Acantkocinus, which appear to us so far asunder, 

 are connected together by insensible gradations of form. The 

 typical species of Toronmis (namely those which have no thoracic 

 spines) are easily distinguishable from Graphisurus ; but if the 

 bounds of the genus be extended a little, so as to embrace a few 

 closely allied species which have small thoracic spinesf, the only 

 difference between the two genera will be one of general form, 

 the Graphisuri being much flattened, with comparatively short 

 antennal joints, whilst the Toronai have convex shapes and very- 

 slender antennae. 



1. Toronaus figuratus, n. sp. 



T. oblongus, convexiusculus, nigro-castaneus, capite thoraceque vitta 

 centrali ochracea : elytris litura humerali, macula magna com- 

 muni ante medium antice et postice per suHiram excurrente, 

 fasciaque lata inflecta prope apieem cinereo-ochraceis. Long. 

 4-5 lin. c? $ . 



Head dark brown, sides of forehead and cheeks each with a 

 yellowish streak, vertex with a broad central yellowish stripe. 

 Antennae slender, twice the length of the body in both sexes, 

 reddish, tips of joints dusky, and bases of third to sixth joints 

 whitish. Thorax not much broader than the head, and with a 

 slight protuberance on each side about the middle, but no trace 



* This genus comprehends the following North-American species : — 



1. G.fasciatus, De Geer, Me'm. v. p. 114, t. 14. f. 7. 

 , Kirby, Fauna Boreali- Americana, Ins. p. 169. 



?= Lamia mixta, Fabr. E. S. Suppl. 144. 26. 



2. G. obsoletus, Oliv. Col. iv. p. 130, t. 13. f. 90. 



= Astynomus Icemcollis, Dj. Cat. 



3. G. pusillus, Kirby, Fauna Bor.-Americana, p. 169. 

 Acantkocinus atomarius (F.), of Europe, is also probably a Graphisurus. 

 t Such as Eutrypanus tessellatus, White, Cat. p. 372 (= E. variegatus, 



Dej. Cat.), and others, not found in the Amazons region. 



