Mexican and Central American Chauliognathinae. 139 



(J. Antennae very elongate, with the last three joints wider than 

 those preceding. 



$. Antennal joints 3-11 narrow, equal in width. 



(^. Aedeagus : median lobe short, very stout, slightly produced 

 at the apex; left lateral lobe short, rather stout, hooked at tlie 

 apex within ; right lateral lobe altogether wanting. Plate V, 

 figs. 9, 9a. 



This species differs from all the other Central- American 

 Chauliognaihi in having the three apical joints of the 

 antennae widened in the male, and in the complete absence 

 of one of the lateral lobes of the aedeagus ; the prothorax, 

 too, is very shining and has the margins broadly reflexed. 

 The colour of the elytra is variable, the yellow portion 

 (extending over the basal half in the type of C. tripartitus) 

 being sometimes absent. C. luctuosus (Latr.) is an alhed 

 form, with one of the lobes of the aedeagus also wanting. 



6. Chauliognathus heros. 



Telephorus heros, Guer., Rev. Zool. 1843, p. 18. 

 Chauliognathus heros, Gorh., Biol. Centr.-Am., Coleopt. iii, 



2, p. 277 (?). 



Chauliognathus dimidiatus, Gorh., loc. cit. p. 69 (part.) ((^). 



Hab. Costa Rica; Panama; Colombia; Ecuador; 

 Peru. 



Var. a. Elytra with about the apical third black. 



Chauliognathus rex, Gorh., loc. cit. p. 68. 



Hab. Mexico, Oaxaca; Guatemala, Vera Paz. 



Var. )8. Elytra narrowly margined with black at the apex. 



Hab. Costa Rica, Volcan de Poas, alt. 2,000 metres 

 {Pittier, in Mus. Brit.). 



Var. 7. Elytra wholly ochreous or flavous. 



Chauliognathus nitidicollis, Gorh., loc. cit. p. 69. 

 Hab. Costa Rica. 



Var. 5. Elytra wholly black. 



Chauliognathus heros, var., Waterh., Trans. Ent. Soc. Lond. 

 1878, p. 326. 



Hab. Ecuador, Quito. 



cj. Aedeagus : apical portion of the median lobe produced 



