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TETEACHA . —PSEUD OXTCHEIL A. 



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with by Rogers in Costa Rica. With regard to the black colouring of the apex of the 

 hinder femora, this exists to a far greater extent in the var. ignea than in geniculata ; 

 in the sobrina type there is generally little or no trace of it. 



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4. Tetracha affinis. 



Megacephala affinis, Dej. Spec. Gen. i. p. 12 \ 

 Megacephala Lebasii, Dej. loc. cit. v. p. 203 2 . ' 

 Megacephala violacea, Reiche, Rev. Zool. 1842, p. 239 2 . 

 Megacephala impressa, Chevrol. Mag. Zool. 1841, t. 56 3 . 



Hab. Mexico, Vera Cruz 3 {Salle) ; Panama, Chiriqui (Champion). — South America, 



Colombia 2 , Venezuela, Cayenne \ 



Belongs to a group in which the thorax is longer (more gradually narrowed behind) 



and the elytra more dilated behind the middle than in the Carolina series of species. 

 The elytra in all the examples of T. affinis which I have seen are very thickly sculp- 



punctures running partly 



into transverse 



tured, the basal half being covered with 



rugae, and the apical half rather closely and uniformly roughened with imbricated 



granula. 



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5. Tetracha angustata. (Tab. I. fig. 1.) 



Megacephala angustata, Chevrol. Mag. Zool. 1841, t. 55 \ 



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Tetracha fuliginosa, Bates, Ent. Monfhl. Mag. x. 1874, p. 261 *. 



Hab. Mexico *, Vera Cruz (Salle) ; Guatemala (Salle) ; Nicakagua, Chontales (Belt 2 ). 



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Very similar to T. affinis, but effectively distinguished by the much fainter and sparser 



lpture of the elytra. The 



of 



surface is sooty black with an oily 



bluish 



g 



The 



lustre, the sides of head, thorax, and elytra being grassy green or 



apical virgule is of similar form, gradually narrowed behind, with scarcely perceptible 



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sinuation. 





6. Tetracha virginica. 



Cicindela virginica, Linn. Syst. Nat. i. 2, p. 657. 

 Megacephala virginica, Dej. Spec. Gen. i. p. 10. 



Hab. North America, Eastern States. — Mexico (Salle). 





PSEUDOXYCHEILA. 



Pseudoxycheila, Guer. Diet. Pitt. vi. p. 573. 

 Oooycheila, Dej. Spec. Gen. v. p. 205. 



Peculiar to Tropical America, but more restricted than the following genus in its 

 range, occurring only on the Andes and its continuations, at considerable elevations. 

 Five species, feebly differentiated from each other, are known. 



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