NEMATODES.— TEIGONOPLEUEUS. 243 



Nematodes atropos, de Bonv. Mon. p. 656, t. 31. fig. 6 1 ; Horn, Trans. Am. Ent. Soc. 1886, 

 p. 41 \ 



Hab. North America 1 , Canada to Louisiana 2 . — Mexico, Cordova 1 (Salle). 



A single specimen of this species from the Salle collection so labelled by de Bon- 

 vouloir seems to differ in some details from North-American examples ; but with the 

 known variability of the members of the genus it would be unsafe to consider 

 it distinct. 



5. Nematodes biarti. 



Nematodes Biarti, de Bonv. Mon. p. 669, t. 32. fig. 4 1 . 

 Hab. Mexico, Orizaba (Biart x ), Jalapa (Hoge). 

 Easily known by the joints 7-9 of the antennas being as broad as long. 



6. Nematodes cylindricus. 



Emathion cylindricum, Cast, in Silberm. Rev. Ent. iii. p. 171 x ; Hist. Nat. Col. i. p, 225 \ 

 Nematodes cylindricus, de Bonv. Mon. p. 676, t. 32. figg. 7, 8 3 . 



Hab. Nicaragua, Chontales (Belt) ; Panama, Volcan de Chiriqui (Champion). — Vene- 

 zuela, Caracas 3 ; Guiana, Cayenne 2 3 ; Amazons, Ega 3 ; Brazil, Bahia 2 3 . 



Of this species de Bonvouloir remarks that it is one of the most variable, and 

 very difficult to accurately define. It belongs to a small group without trace of 

 elytral striae. 



TRIGONOPLEURUS. 

 Trigonopleurus, de Bonvouloir, Mon. des Eucnemides, p. 681 (1870). 



Closely related to Nematodes, but with the metasternal episternum much narrowed 

 in front. The two species known agree in having the fourth and fifth joints of the 

 antennas very small and equal, together shorter than either the third or sixth. 



l. Trigonopleurus alienus. 



Subcylindrical, moderately elongate, parallel, piceous -black, opaque, sparsely clothed with a short, indistinct, 

 cinereous pubescence : antennas piceous, a little longer than the thorax ; head convex, densely coarsely 

 punctate, a very short carina in front ; thorax longer than wide, slightly wider at the apical third than at 

 the base, sides straight, arcuately narrowed in front, disc convex, an acutely impressed line extending from 

 the basal margin one third towards the apex, surface densely rather asperately punctate ; elytra finely 

 striate, intervals flat, closely roughly punctate, less so than the thorax ; body beneath piceous-black, cinereo- 

 pubescent, closely punctate, more coarsely on the abdomen ; femora piceous, tibiae and tarsi brown. 



Length 5 millim. 



Hab. Panama, Tole, (Champion). 



The only other known species of the genus is said to be from Victoria, N.S.W.*, 

 which differs from this in colour and in the presence of a long carina on the front. 



* This locality requires confirmation : Gemminger and Harold, Cat. v. p. 1479, give " Amer. bor. ;" but the 

 genus is not known to me from temperate North America. 



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