140 Mr. G. C. Champion's Revision of the 



into a long, spoon-shaped process ; lateral lobes long, sinuous, the 

 left lobe narrowing to the tip, the right lobe longer, broader, 

 and more sinuate than the left, bifid at the apex, the inner produced 

 apical portion acute and claw-like. Plate V, fig. 10. 



The type of C. heros has the apical half of the elytra 

 black, the black being a Uttle less extended in the northern 

 C. rex and altogether wanting in the var. y (nitidicollis, 

 Gorh.) ; var. {3 is intermediate between the latter. At 

 Quito, Ecuador, as noted by Waterhouse, a form with 

 uniformly black elytra occurs. The abdomen in the type 

 is yellow, spotted with black along the sides; but the 

 ventral segments, the last excepted, are often more or less 

 nigro-fasciate in all the forms. The relatively broader 

 prothorax of C. heros, mentioned by Gorham as a dis- 

 tinguishing character, is simply a female peculiarity. The 

 prothorax itself is always ochreous, with a small, rounded, 

 black central spot; and the surface is shining in some 

 examples and opaque in others, possibly according to the 

 maturity of the insect. One of the dark males before me 

 from Ecuador has subparallel elytra. The structure of 

 the aedeagus is precisely similar in the male of each form. 



7. Chauliognathus dimidiatus. 



Chauliognathus dimidiatus, Waterh., Trans. Ent. Soc. 

 Lond. 1878, p. 330 (?); Gorh., Biol. Centr.-Am., 

 Coleopt. iii, 2, p. 69, pi. 5, fig. 3 (c^) (exclud. Costa 

 Rican specimen) {nee Dej. Cat.). 

 Hab. Mexico, Vera Cruz; Nicaragua, Chontales. 



Var. a. The elytra wholly black, the prothorax fuHginous, paler 

 along the reflexed margins. 



Hob. Ecuador, Paramba. 



<^. Aedeagus : apical portion of the median lobe produced 

 into a long, spoon-shaped process; left lateral lobe very elongate, 

 feebly sinuate, and armed with a short tooth at the apex within ; 

 right lateral lobe shorter and more strongly sinuate than the left, 

 angularly dilated before the apex, and armed with a stout hook on 

 the dorsal aspect just before the bifid tip (tlie apex thus appearing 

 trifid, when viewed from in front). Plate V, figs. 11, 11a. 



This species has the entire upper surface duller than in 

 C. heros, and the prothorax (which varies a good deal in 

 shape, irrespective of sex) wants the central spot. The 



