Mexican and Central American Chauliognathinae. 141 



abdomen is variable in colour. The Central American 

 specimens (seven females and three males seen) are simi- 

 larly coloured above; but in Ecuador an almost wholly 

 black form is not uncommon. Of this dark variety there 

 is a long series in the British Museum, found by Mr. Kosen- 

 berg, at Paramba, alt. 3,500 feet, in April, 1897, during the 

 dry season. The male of this dark form has the aedeagus 

 shaped exactly as in the three Nicaraguan specimens of 

 the same sex of typical C. dimidiatus. 



8. Chauliognathus faustus. 



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

 iii, 2, p. 278, pi. 12, fig. M (?). 



(J. Aedeagus : apical portion of the median lobe produced 

 into a long stout process; lateral lobes very elongate, sub" 

 equal in length, the left lobe sinuate, blunt, and closely ciliate 

 at the tip, and armed with a very minute tooth at the inner apical 

 angle, the right lobe strongly sinuate, bowed inward at about the 

 middle, and armed with a sharp claw towards the tip, the latter 

 entire and somewhat pointed. Plate V, figs. 12, 12a. 



Hah. Panama, Chiriqui. 



This insect, at first sight, would appear to be nothing 

 more than a form of G. dimidiatus (corresponding to the 

 var. nitidicollis of C. heros) with entirely pale elytra and a 

 rosy-red prothorax ; but, as the lateral lobes of the aedeagus 

 are differently shaped in the two males examined, C. faustus 

 must be retained as a distinct species. The prothorax is 

 transverse in both sexes (ten females and two males seen) ; 

 but as it varies in shape in C. heros, no rehance could be 

 placed on that character alone. 



9. Chauliognathus distinguendus. 



Chauliognathus distinguendus, Waterh., Trans. Ent. Soc. 



Lond. 1878, p. 328. 

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



iii, 2, p. 70. 



Hah. Guatemala; Nicaeagua; Costa Rica. 



Var. o. The elytra with the black discoidal subapical patch 

 nearly reaching the outer margin, and coalescent anteriorly with 

 the common scutellar mark, the outer limb to beyond the middle 

 and the prothorax also (the large black patch on the disc excepted) 

 sometimes rosy -red. 



