4 HETEROMERA. 
base; the elytra without opaque lateral patch ; and the head more or less narrowed or 
constricted behind into a neck.. The eyes vary considerably in size in the different 
species, but the head is usually narrowly extended on each side behind them. The 
apical joint of the antenne in some species is very long, often exceedingly elongate in 
the male; but in others (S. glabrata, S. irregularis, &c.) it is only about as long as 
joints 8-10 or 9 and 10 united, and not longer in the male than in the female. The 
presence or absence of a complete lateral carina to the thorax, the clothing or armature 
of the femora and tibiz, and the sulcation of the latter (recently noticed by Dr. Horn), 
are characters of great assistance in discriminating the numerous species: none of these 
points of difference are noticed by Maklin. The armature of the anterior femora and 
tibiee in the species here placed at the beginning of the genus, it may be noted, is not 
a male character, but is shared equally by the female. The spurs of the tibie, though 
short, are quite distinct in many of the species, while they are indistinct in others. 
A few species of small size, §. irregularis &c., have the thorax transversely convex 
and short, the apical joint of the antenne comparatively short in both sexes, and the 
prosternum exceedingly narrow and raised nearly to the level of the anterior coxe ; 
they cannot, however, be satisfactorily separated from Statira*. The number and 
position of the setiferous impressions on the elytral interstices afford good specific 
characters. The sixth ventral segment is sometimes extruded and visible ; but, like the 
elongate apical joint to the antenne in the male, it is apparently of no value as a generic 
character in this family t+. Most of the species obtained by myself were found upon 
herbage or under loose bark, or beaten from the decaying branches of fallen trees. The 
earlier stages are probably passed in rotten wood or in decaying vegetable matter. 
The following table will assist in the recognition of the Central-American species ¢ ; 
but it must be remarked that certain species which are otherwise closely allied are by 
this arrangement widely separated, e.g. S. nigrosparsa and S. guatemalensis :— 
A. Tibize rounded and not sulcate on their outer edge. 
a. Anterior femora denticulate and the anterior tibiz toothed within in 
both sexes © 0 ee tt te ee ge wee ee es «Species 1, 2. 
b. Anterior femora unidentate and the anterior tibie unarmed within in 
TG BERGE 68a ee a ee se ee Species 3. 
c. Anterior femora ciliate and the anterior tibiz toothed within in both 
BEXON ee ee ee ee a ee ae ee Species &, ob. 
* South-American species differing thus from Statira are noted by Lacordaire (Gen. Col. v. p. 572, nota). 
+ Leconte and Horn (Class. Col. N. Am. 1883, p. 393) state that the ‘Statirini’ are distinguishable by these - 
characters from the genuine ‘ Lagriini’; but this is a mistake, The former, however, may be known from 
the latter by the prosternum being raised between the anterior coxe ; Arthromacra agrees with the ‘ Lagriini ’ 
in having tbe prosternum depressed or not raised between the anterior coxe. 
+ S. tristis, Mikl., is unknown to me, and owing to the imperfect description it cannot be included in the 
table; it is accordingly placed at the end of the genus. 
