IGG Mr. C C. Champion's Revision of the 



in the black head, the less expanded margins of the pro- 

 thorax, the prothorax itself much narrower and subparallel- 

 sided in ^, the testaceous humeri and scutellum, and 

 the angularly dilated left lateral lobe of the aedeagus. 

 Two of the specimens have the prothorax immaculate. 

 The somewhat similarly coloured C. marginatns, F., has 

 less subulate elytra and a differently formed aedeagus. 



39. Chauliognathvs histrio. 



Chauliognathus histrio, Gorh., Biol. Centr.-Am., Coleopt. 

 iii, 2, pp. 75, 281. 



(J. Aedeagus : median lobe obliquely bent, slightly produced at 

 tip ; left lateral lobe very elongate, sinuous ; right lateral lobe about 

 one-half shorter than left, compressed, curved. Plate VIII, fig. 42. 



Hab. Mexico, Durango, Vera Cruz. 



Sixteen specimens seen, scarcely varying in colour, the 

 sexes in about equal proportion. C. histrio is very like 

 the form of C. lituratus with broadly fusco-vittate elytra, 

 and has a similar horseshoe-shaped black mark on the 

 disc of the prothorax; but the elytra in both sexes are 

 greatly abbreviated, and have the apices rather broadly 

 yellow. These two insects have the aedeagus formed as 

 in C nigriceps, and all three have been received from the 

 same locality in Vera Cruz, Playa Vicente. As Gorham 

 states, the present species is very like the N.- American 

 C. marginatvs, F., now known to extend southward to 

 Nuevo Leon in Mexico; but the latter has stouter and 

 more tapering antennae in both sexes, less abbreviated 

 elytra, a broadly nigro-vittate prothorax, etc. 



40. Chauliognathus nigriceps. (Plate III, fig. 16, 

 var., ^.) 



Chauliognathus nigriceps, Gorh., Biol. Centr.-Am., Coleopt. 

 iii, 2, pp. 74, 280 (<^$). 

 Hab. Mexico; British Honduras; Guatemala, Vera 

 Paz ; Nicaragua. 



Var. a. Elytra narrowly margined with black from a little below 

 the base to near the apex, the black marginal streak often becoming 

 broader posteriorly, thus leaving an indication of a yellow apical 

 spot. (<??.) 



Chauliognathus nigriceps, var., Gorh., loc. cit. p. 74. 



