and Central A^nerican Telephorinae. 77 



dentate in front of the excision, and arcuately converging thence to 

 the apex, the hind angles acute ; ($) broader, more rounded at the 

 sides, the latter bisinuate towards the base. Elytra moderately 

 long, much wider than the prothorax, somewhat dilated at the sides 

 in $, costulate and rugosely sculptured. Inner claw of anterior 

 tarsi, and outer claw of the other tarsi, lobed at base. 

 Length (excl. head) 5|-7, breadth 2-2| mm. (^ ?.) 



Hab. Mexico {Truqui, m Mus. Brit. ; Coffin, in Mus. 

 Oxon.). 



Two pairs. This insect is very like the N. -American 

 Polemius laticornis (Say), but has shorter and stouter 

 antennae, a shorter and more equally dilated prothorax, 

 and the margins of the latter deeply obliquely excised 

 near the base in the male, much as in P. {Discodon) 

 liigubris, Gorh. P. spissicornis has the facies of a small 

 Lampyrid. The antennae scarcely differ in form in the 

 two sexes. 



7. Polemius difflcilis. 



Discodon difficile, Gorh., Biol. Centr.-Am., Coleopt. iii, 

 2, p. 86 {nee p. 288, and fig. of T. 23hoturinus, pi. 6, 

 fig. 19, $) (Guanajuato examples only, ^ $). 



Polemius difficilis, Schaeff., Journ. N. York Ent. Soc. 

 xvi, p. 61. 



Comparatively short and broad, dull, finely pubescent; black, 

 the anterior portion of the head, base of mandibles, basal joint of 

 antennae externally, and prothorax flavous or testaceous. Head 

 broad ; eyes moderately large and prominent in (^, smaller in $. 

 Antennae rather short, comparatively stout, subserrate, tapering 

 outwards. Prothorax very broad in both sexes, subtruncate at the 

 apex (as seen from in front), rounded at the sides anteriorly; the 

 margins narrowly notched towards the base in cj, and abruptly 

 emarginate at the same place in $. Elytra rather short, of the same 

 width as the prothorax at the base, blunt at the tip, somewhat or 

 moderately explanate at the sides from a little below the humeri, 

 the sculpture rather coarse. Inner claw of anterior tarsi, and outer 

 claw of other tarsi, broadly lobed in J. 



Var. o. Prothorax with a black anteriorly dilated median vitta. 



Discodon triste, Gorh., loc. cit. p. 287 (part.) (Ventanas 

 specimens, $). 



Var. )3. Anterior half of head, basal joint of antennae, scutellum. 



