Mexican and Central American Chauliognathinae. 151 



ous, with a black discoidal vitta extending from a little below the 

 base to near the tip, the base sometimes transversely fuscescent 

 on either side of the scutellum ; abdomen ochreous, the apical 

 segment and aedeagal cap more or less infuscate; anterior and 

 intermediate tibiae testaceous. Head moderately large, the eyes 

 not prominent ; antennae very elongate in ^, shorter in $, tapering 

 slightly at tip, joint 3 about half as long as 4. Prothorax large, 

 broader than long, in $ almost as wide as the elytra, rounded at 

 each angle, the margins rather broadly reflexed. Elytra subulate. 



cJ. Aedeagus : median lobe obliquely bent ; left lateral lobe 

 long, concave, angularly dilated at about the middle, the apical 

 portion abruptly curved, acuminate, hooked at the tip; right 

 lateral lobe much shorter than the left, twisted and angularly 

 dilated inwards near the base, the apical portion curved and com- 

 pressed, blunt at the tip. Plate VII, figs. 23, 23a. 



Length (excl. head) 9i-10 mm. {^ ?•) 



Hab. Mexico {Mus. Brit.), Orizaba in Vera Cruz (Salle). 



Three males and two females, apparently distinct from 

 the similarly coloured northern C. pennsylvanicus, De 

 Geer * ; difiering from it in the relatively larger prothorax 

 (especially noticeable in $), and the more subulate elytra. 

 From similarly coloured varieties of C. scutellaris the 

 broader and more transverse prothorax will serve to dis- 

 tinguish C. mundus. The aedeagus exhibits the same 

 general structure in all these nearly related forms. 



20. Chauliognathus scutellaris. 



Chauliognathus scutellaris, Lee, Proc. Acad. Phil, vi, p. 



230 (1853); Trans. Am. Ent. Soc. ix, p. 44 (1881); 



Gorh., Biol. Centr.-Am., Coleopt. iii, 2, p. 283 (part.). 

 Chauliognathus basalis, Lee, Col. of Kansas and E. New 



Mexico, p. 13 ; Trans. Am. Ent. Soc. ix, p. 44. 

 Chauliognathus lewisii, Crotch, Trans. Am. Ent. Soc. v, 



p. 78 (1874). 



cJ. Aedeagus: median lobe obliquely bent; left lateral lobe 

 long, angularly dilated at about the middle, and abruptly and 

 arcuately bowed thence to the apex, the basal portion stout, the 

 apical portion much narrower and hooked at the tip ; right lateral 

 lobe about as long as the basal portion of tlie left lobe, compressed, 

 and obliquely bent. Plate VII, fig. 24. 



Hah. North America, Kansas, Texas, New Mexico, etc. ; 

 Mexico, Monclova in Coahuila {Dr. Palmer), Saltillo in 



* The life history of this species has been fully described by Riley, 



