254 HETEROMERA. 
transverse ; antennsz piceous-black ; prothorax broad, the anterior angles broad, swollen, and rounded, the 
hind angles strongly and acutely produced, the base distinctly emarginate in the middle before the scutellum, 
the disc broadly transversely impressed behind, the basal fovew short but deep, the surface comparatively 
coarsely, sparingly, and very irregularly punctured, a broad longitudinal space on the posterior half of the 
disc more or less impunctate; elytra broad, narrowing very gradually to some distance beyond the middle, 
thence more rapidly so to the apex, with rows of shallow fine punctures, the terminal spines rather short ; 
legs smooth, sparingly punctured, brownish-eneous; posterior tibie for about one fourth of their length 
flattened on the inner side before the middle (this space feebly concave and dull within), and the femora 
glabrous (the trochanters with a few longish bristles) beneath, in the male ; beneath very shining, brownish- 
eeneous, the metasternum with numerous scattered coarse impressions, the ventral surface finely and 
sparingly punctured. 
Length 164-173 millim. (¢ 9.) 
Hab. Nicaragua, Chontales (Belt). 
Three examples. This is the largest and finest of the Central-American species. 
2. Acropteron langurioides. 
Closely allied to A. belt, and differing as follows:—Smaller and narrower; the head not so deeply excavate, 
similarly sculptured; prothorax much more finely and shallowly punctured; the elytra distinctly nar- 
rower (especially in the male), and narrowing more rapidly from the base ; the posterior tibiee in the male 
formed as in A. belt?; the metasternum more sparingly punctured ; the rest as in A. belt. 
Length 14-16 millim. (35 2.) 
Hab. Panama, Bugaba, Volcan de Chiriqui (Champion). 
Many examples. ‘This species will be easily distinguished from A. belti by the above- 
mentioned characters; the elytra in most specimens are rather more coarsely striate- 
punctate than in that insect, though the thorax is invariably much more finely punc- 
tured; the colour of the upper surface is rather more of a golden-bronze, sometimes 
the thorax is slightly tinged with cupreous; the transverse depression on the base of 
the latter is usually deep. 
3. Acropteron maklini, (Tab. XI. fig. 12, 3.) 
Greenish-bronze, shining. Head closely, irregularly, and rather coarsely punctured, transversely excavate in 
front, a shallow rounded fovea on the vertex; antenne piceous, the two basal joints and the outer half of 
the apical one ferruginous ; prothorax broader than long, the anterior angles broadly rounded, the posterior 
angles acutely produced, the sides almost straight, the base shallowly emarginate before the scutellum, the 
disc very shallowly transversely impressed behind, the basal fovee short but deep, the surface moderately 
coarsely, irregularly, and somewhat closely punctured, the punctures not quite so closely placed on the 
disc; elytra narrowing from the base, with rows of rather coarse punctures, the terminal spines short; 
legs smooth, sparingly punctured, brownish-eneous, sometimes lighter; posterior tibia curved, obliquely 
widened on the inner side at the apex, and the outer half slightly concave within, and the femora almost 
glabrous beneath, in the male. 
Length 10-11} millim. (¢ 9.) 
Hab PanaMa, Bugaba, Volcan de Chiriqui (Champion). 
Numerous examples. From A. agriloides this species will be known by its more 
sparingly punctured head and thorax, the latter with the basal foveee more deeply 
impressed (the disc as in that species very shallowly impressed behind), smoother tibie, 
and male characters. 
