8 MALACODERMATA. 
3. Lygistopterus sulcicollis. 
Niger, rostro tibiis anticis longitudine equali; elytris sordide flavis, circa scutellum usque ad medium infu- 
scatis ; thorace ineequali, sulco profundo in medio dilatato, lateribus flavis. 2. Long. 16 millim. 
Hab. Mexico, Juquila (Sallé). 
This peculiar species is in the colour of the elytra unlike any which are yet described ; 
yet its characters are entirely those of a Lygistopterus. The thorax has the central 
channel wide and deep, its sides and the oblique carina very strongly raised, the former 
terminating in a tubercle near the base, which, with the sides, is reflexed. It is unique. 
4, Lygistopterus hematopterus. (Tab. II. fig. 1.) 
Nigro-cyaneus, elytris rubris, prothorace inequali, sulco mediano dilatato, rostro brevi. ¢ 2. Long. 12-138 
millim. 
Hab. Mexico, Jacale (Salé). 
Blue-black, shining beneath ; antenne scarcely half the body’s length, compressed, 
not serrate ; the joints scarcely widened more internally than outwards ; rostrum short. 
Thorax as wide as long, the usual parts raised, and very evident blue-black rather 
shining. Elytra bright brick-red, clothed with very close pubescence, with not distinct 
raised lines. ‘The male has the penultimate segment not excised. 
CALOPTERON. 
Calopteron, Guérin, Voyage Coquille, p. 72 (18380). 
Upward of a hundred species have now been described, and nearly all from South 
America. Calopteron appears to be the characteristic genus of the Lycide in America ; 
I have not seen any species from other parts of the world which can properly be referred 
to it. It extends as far north as the United States; its limits in the southern direction 
are not well ascertained. 
At present the genus contains both species with very inflated elytra and very narrow 
linear insects, and is no doubt capable of subdivision. Hitherto but one species (C. cor- 
rugatum, Candéze) has been recorded, in any systematic work, from Central America ; 
recent exploration has shown that they are as abundant there as in South America. 
We have now to record twenty-seven species. 
Section A i. Elytra widened posteriorly ; thorax with a simple carina ; 
antenne at most only serrate. 
1, Calopteron bifasciatum. (Tab. I. figg. 11, 12 var.) 
Niger, thorace subquadrato lateribus luteis ; elytris ad apicem dilatatis et convexis, lete caxruleis, basi et fascia 
pone medium flavis. ¢. Long. 14-20 millim. 
