72 LONGICORNIA. 
from the front nearly to the hind margin, in which the short central black vitta seems 
partly imbedded. The black vitta is, in fact, only the surface-colouring of-a narrow 
strip of the integument, which is vertically flexuous, and at its extremity (near the 
centre of the pronotum) is detached from the sides of the sulcus. The same peculiar 
structure is seen in E. nobilis; but the sculpture is not so coarse in that species. The 
scutellum is formed nearly as in EL. nietot. 
4, Evander xanthomelas. 
Amphidesmus xanthomelas, Guérin, Rev. Zool. 1844, p. 258; Mag. Zool. 1844, Amphidesmus, p. 3. 
Hab. Mexico!; Guatemaa, Tocoy, 1000 feet (Champion). 
DELTOSOMA. | 
Deltosoma, Thomson, Syst. Céramb. p. 258 (1864); Lacordaire, Gen. Col. ix. p. 163. 
This genus belongs to a small group in which the elytra are dilated and flattened out 
in imitation of the Lycide (tribe Malacodermata), the characteristic colours of which — 
they also imitate. Deltosoma is further remarkable for the distinct lateral margins 
of the pronotum, a character of the Prionide family. Only one species has been 
described; but others, all very closely allied, exist unnamed in collections. The range 
of the genus is confined to-Tropical America, from Bolivia to Guatemala. | 
1. Deltosoma guatemalense. 
Paullulum convexum, elytris gradatim modice a humeris usque prope apicem dilatatis, apice ¢ magis, 2 minus, 
late et obtuse rotundatis, marginibus haud explanato-reflexis ; thorace fere semicirculari, basi utrinque 
sinuata ; elytris obtuse et late bicostatis ; corpore toto breviter erecte setoso, cum antennis pedibusque 
nigro, occipite medio, thoracis marginibus et maculis dorsalibus fulvis; elytris cyaneo-nigris, humeris et 
fascia lata mediana fulvis, 
Long. 53-83 lin. ¢ Q. 
Hab. GuaTEMALA, San Gerdnimo (Champion). 
The amount of tawny-yellow colour on the thorax is variable: there is always a spot 
on the front margin near the middle; but sometimes there are also two other spots 
nearer the disk; the underside of the thorax is sometimes nearly entirely fulvous. 
PTEROPLATUS. 
Piteroplatus, Buquet, Rev. Zool. 1840, p. 287; Ann. Soc. Ent. Fr. 1840, p. 385; Lacordaire, 
Gen. Col. ix. p. 164. 
The species of this genus (also peculiar to America) closely mimic the Lycide, and 
they are more numerous than the Deltosome. The range is rather more extended, 
reaching from the Argentine territory in the south to Florida in the north. Twenty 
species have been described. 
