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



process towards the tip. This last-mentioned structure 

 separates C. evanidus from C. exsanguis, etc. 



28. Chauliognathus liiuralus. 



Chauliognaihus lituratus, Gorh., Biol. Centr.-Am., Coleopt. 

 iii, 2, pp. 74, 280. 



Hah, Mexico, Vera Cruz, Oaxaca ; Guatemala ; 

 Nicaeagua; Panama. 



Var. a. The black horseshoe-shaped patch on the disc of the 

 prothorax more extended ; the elytra testaceous or fuscescent. ((^^ ?.) 



Chauliognaihus emaciatus, Gorh., loc. cit. p. 75, pi. 5, 

 fig. 17 (?). 



Hab. Guatemala. 



Var. $. The elytra almost entirely infuscate, the prothoracic 

 marking obsolete. ($.) 



Hab. Mexico, Tabasco; Guatemala. 



Var. 7. The head rufescent or testaceous, nigro-bivittate at the 

 base; the prothorax with an oblong black patch on the disc; the 

 elytra pale. ($.) 



Hab. Mexico, Jalapa. 



(J. Aedeagus : median lobe long, obliquely bent, spoon-shaped at 

 the tip; left lateral lobe extremely elongate, more or less sinuate, 

 feebly hooked at the apex; right lateral lobe one-half or one-third 

 shorter than the left, twisted, compressed, distinctly hooked at the 

 tip. Plate VIII, figs. 33, 33a. 



A very variable insect, and not uncommon in Southern 

 Mexico and Guatemala. In the form described by Gorham 

 as C. lituratus the elytra, which do not completely cover 

 the abdomen, are testaceous or yellow, and often have the 

 whole of the disc (the sutural and lateral margins excepted) 

 infuscate, and the prothorax has a horseshoe-shaped 

 black patch (sometimes divided into two spots) on the 

 disc. The head usually has the basal half almost entirely 

 black; it is gradually narrowed behind, and is large and 

 elongate in the male, but the eyes are not prominent in 

 either §ex. Four males have been dissected, showing Httle 

 variation. The structure of aedeagus is extremely Uke that 

 of C. exsanguis. 



