166 HETEROMERA. 
Fam. XYLOPHILIDZ. 
We follow Thomson (Skand. Col. vi. p. 367) in referring Xylophilus and the genera 
formed at its expense to a separate family. The form of the abdomen and tarsi is very 
different from that of the Pedilide or Anthicide, with one or the other of which they 
are associated by most authors. The first and second ventral segments of the abdomen 
are connate and immovable, a character noticed by Thomson, but overlooked by other 
writers: Lacordaire, Mulsant and Rey, Jacquelin-Duval, and Leconte and Horn all 
include Xylophilus in groups stated to possess five (distinct or free) segments, exclusive 
of the short and sometimes visible sixth. The antepenultimate joint of the tarsi * is 
produced beneath into a long and rather broad lobe, which extends beneath the small 
penultimate joint to beyond the base of the apical one, the lobe itself being feebly 
emarginate at the apex. These two characters, apart from others to be derived from 
the shape of the head, &c., at once distinguish this family from all others of the 
Heteromera {. Many authors place Xylophilus and Scraptia in the same group or 
family; but these genera are not closely allied, though they have the head very 
similarly formed. 
XYLOPHILUS. 
Xylophilus, Latreille, Fam. Nat. du Régne anim. p. 383 (1825) ; Lacordaire, Gen. Col. v. p. 584. 
Aderus, Westwood, Zool. Journ. v. p. 57 (1829). 
Euglenes, Westwood, Zool. Journ. v. p. 59 (1829). 
Phytobenus, Sahlberg, Nov. Col. Fenn. p. 9 (1834). 
Olotelus, Mulsant & Rey, Hist. Nat. Col. Fr., Colligéres, p. 22 (1866). 
Anidorus, Mulsant & Rey, loc. cit. 
Sixty-two species of this genus have been described; of these, twenty-three are from 
Europe, five from Algeria, six from Japan, three from Ceylon, and sixteen from the 
United States of North America. No less than thirty-six are here recorded from 
Central America, and the genus will probably prove to be equally numerous in species 
in the northern parts of South America; no American species has hitherto been 
described from south of Texas or Florida. Of these thirty-six species, most of which 
are exceedingly distinct, and not at all closely allied, nearly two thirds (twenty-two) 
are represented by single examples only, and at least double this number must inhabit 
Central America. 
Not a single representative of the genus is contained in either of the very extensive 
Mexican collections of M. Sallé or Herr Hoge; and the only specimens of Mexican 
AXylophili we possess are a few recently captured by Mr. H. H. Smith. The general 
-® Mistaken for the penultimate by Lacordaire and Westwood. 
+ In our figures of Xylophilus the tarsi are represented as 4-, 4-, 3-jointed, the penultimate joint being 
too small to be shown. 
¢ The Agialitide, containing one genus only, Zgialites, is stated by Leconte and Horn to have the first and 
second ventral segments connate. 
