438 HETEROMERA. 
31. Hymenorus americanus. 
Oblong ovate, brownish-piceous or obscure reddish-brown, the prothorax usually of a more reddish tint and sub- 
opaque, the elytra a little more shining, thickly clothed with short pubescence. Head closely and coarsely 
punctured, the vertex still more coarsely so; eyes small and widely separated in both sexes ; antenne 
short and stout, the joints short and very distinctly widening towards their apex, ferruginous ; prothorax 
transverse, rather convex, the sides straight behind and rounded and narrowing in front, the hind angles 
rectangular, the basal fovee indistinctly indicated, the base rather strongly bisinuate, the surface densely 
and finely punctured ; scutellum closely punctured; elytra a little wider than the prothorax at the base, 
rather short, finely and shallowly punctate-striate, the interstices almost flat and closely punctured ; legs 
short, ferruginous, the first joint of ‘the hind tarsi rather shorter than the following joints united. 
3g. Fifth ventral segment shallowly foveolate in the middle. 
Length 43-5§ millim.; breadth 17-23 millim. (¢ @.) 
Hab. Mexico (coll. F. Bates), Colima city, Chilpancingo, Jalapa (Hodge) ; GUATEMALA, 
Rio Naranjo, Zapote (Champion); Nicaragua, Granada (Sallé). 
This is one of a group of numerous species inhabiting the southern United States, 
Mexico, Guatemala, and Nicaragua, but not known to me from further south. Three 
only (H. confertus, H. densus, and H. punctatissimus, Lec., all from the southern United 
States) have been hitherto described. From H.densus the present species may be sepa- 
rated by its broader and more transverse thorax (the sides of which are more rounded) 
and entirely ferruginous antenne; from H. confertus (a Californian male example of 
which, determined by Leconte himself, is before me) by its shorter and stouter antenne 
(the joints of which are more serrate in shape), more coarsely punctured vertex, shorter 
and rather more coarsely punctate-striate elytra, and more ovate shape; and from 
H. punctatissimus by the more coarsely punctured thorax. The single example in 
Mr. F. Bates’s collection is labelled H. confertus, Lec. Guatemalan examples have the 
vertex still more coarsely punctured, but intermediate forms occur. All these species 
have small and widely separated eyes in both sexes, a densely punctured thorax, finely 
punctate-striate elytra (the interstices of which are almost flat and closely punctured), 
and a subopaque surface. 
32. Hymenorus densus. 
Hymenorus densus, Lec. New Sp. Col. p. 188 (1866) °. 
Hab. Norru America, Florida 1, Texas.—Mexico, Vera Cruz (Sallé). 
A single example from Vera Cruz in the Sallé collection agrees well with others from 
Texas and Florida. This species may be distinguished from the allied forms by its 
rather long, coarsely and densely punctured, reddish thorax, the sides of which are 
parallel behind and gradually narrowed and rounded in front, and by its antenne being 
fusco-ferruginous with the two basal joints red. 
33. Hymenorus ruficollis. (Tab. XX. fig. 8.) 
Oblong ovate, brownish-piceous, the head and thorax more or less red, very dull and opaque, thickly clothed 
with short pubescence. Head closely and coarsely punctured ; eyes small and widely separated in both 
