PELECOTOMOIDES.—EMENADIA. 353 
Three examples, all females. A specimen of the same sex, from Brazil, in Mr. F. 
Bates’s collection (from that of Dejean), labelled Trigonodera nebulosa, is no doubt a 
variety of the same species ; it has the pubescence of the upper surface golden-brown, 
with the base of the thorax and some markings at the base of the elytra, and a few 
small spots on the disc of the latter, whitish. The description of Zrigonodera 
pallipes, Gerst., based upon a male example from Brazil, nearly agrees with the 
present insect as regards the form of the antenne; but Gerstiicker says “articulo 
primo oblongo-triquetro, sequentibus quatuor transversis,” a definition not applicable 
to P. nebulosa ( ¢ ). 
EMENADIA. 
Ripiphorus, Fabricius, Ent. Syst. i. 2, p. 109 (1792) (part.). 
Macrosiagon, Hentz, Trans. Am. Phil. Soc. iii. p. 462, t. 15. figg. 3 a—d (1830). 
Emenadia, Castelnau, Hist. Nat. Ins. Col. ii. p. 261 (1840); Lacordaire, Gen. Col. v. p. 627; 
Gemminger & Harold, Cat. vii. p. 2120. 
Rhipiphorus, Gersticker, Rhipiph. Col. Fam. Disp. Syst. p. 19 (1855); Horn, Trans. Am. Ent. Soc. 
v. p. 121. 
This genus is represented in most parts of the world, and several of its members are 
extremely variable in colour. Some of the American species are very widely distri- 
buted, and out of the eight enumerated by Dr. Horn in his excellent monograph of 
the species of the United States (op. cit. pp. 121-125), no less than six occur within 
our limits; of these latter one only was noticed by Gerstiicker as from Mexico. Four 
other species are also recorded here from Mexico or Central America, two of which are 
described as new. ‘The important structural characters to be found in the form of the 
prosternum and in the anterior and hind tarsi are noticed by Dr. Horn; they seem to 
_have been entirely overlooked by Gerstacker. The name Macrosiagon, Hentz, though 
it is ten years earlier than that of Castelnau, has not been adopted by authors. The 
Central-American species may be tabulated thus :— 
Anterior coxee contiguous towards the tip; vertex very much raised. 
Basal lobe of the thorax with a strong, acute, transverse elevation, the space 
between this and the tip deeply excavate . . . . . . . . . . . Species 1. 
Basal lobe of the thorax moderately raised or convex. 
The thorax with a very deep, abrupt, triangular excavation on either 
side of the disc towards the base; elytra strongly dehiscent, very 
acute at the tip. . . 2... . . woe . . Species 2. 
The thorax with a longitudinal groove on either side of the disc behind. 
The elytra long, sharply pointed, moderately dehiscent . . . . Species 3. 
The elytra shorter, more obtuse at the tip, strongly dehiscent . . Species 4. 
Basal lobe of the thorax not raised, faintly carinate or with a smooth 
central line, notched at the tip . . . . Species 5-8. 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 2, November 1891. O07 
