HETEROMERA. 457 
One male example. Closely allied to X. atricolor, from the State of Panama; but 
larger and broader than the male of that insect (the head and elytra wider in propor- 
tion to the width of the thorax), the head and thorax more densely punctured, the 
latter a little wider at the base, with the sides less parallel, the elytra obliquely 
depressed on the basal portion of the disc, the anterior femora stouter and the anterior 
tibize less bowed in the male. | 
16 (a). Xylophilus geniculatus. (Lab. XXI. fig. 8, ¢.) 
Moderately elongate, rather broad, somewhat convex, black, shining, thickly clothed with long, ashy pubescence, 
the pubescence not hiding the punctuation; the palpi and antenne pitchy-brown, the latter with joint 2 
entirely, and 3 and 11 at their tips, testaceous ; legs pitchy-brown, with the tibie testaceous at the base ; 
the upper surface densely punctured, the punctures coarse on the elytra, finer on the head and prothorax, 
the head more sparsely punctate between the eyes. Head not much wider than the prothorax, narrowly 
extended on either side behind the eyes, the latter hairy, moderately large, separated by a space nearly 
equalling the width of the eye as seen from above; antennw—( g ) moderately elongate, rather slender, 
joint 3 much longer than 2, 3-10 about equal in length and increasing slightly in width, longer than 
broad, 11 stout, twice as long as 10, ovate, obliquely acuminate—( @ ) a little shorter, with the penultimate 
joints as broad as long and the apical one shorter ; prothorax broader than long, moderately convex, the sides 
parallel behind, rounded in front, the disc almost unimpressed ; elytra rather short, narrowing from about 
the middle, about twice as long as broad, without oblique groove on the disc anteriorly ; legs moderately 
long, slender, the femora a little thickened, the hind pair stout in the male, more slender in the female ; 
anterior tibie feebly sinuate within and armed with a very short, fine tooth at the inner apical angle in 
the male. 
Length 2} millim. (¢ ¢.) 
Hab. Mexico, Tlalpam (Flohr); Guatema.a, Quiche Mountains 8000 feet (Champion). 
Four examples. The single ( ¢ ) specimen from Guatemala was doubtfully referred by 
me (ante, p. 178) to X. funereus; from which the present species may be known 
by its less elongate, less parallel shape, rather more widely separated eyes, and differently 
coloured legs and antennee—these organs being entirely black in X. funereus. ‘The dark 
tarsi &c. will distinguish X. geniculatus from X. atricolor and X. flavipalpis. 
Xylophilus bicolor (p. 182). 
To the Mexican locality given, add:—Near the city (Hoge), Tlalpam, Amecameca 
(Mohr). 
Found in numbers by Mr. Flohr on oaks near the city of Mexico. This species 
varies greatly in the colour of the elytra, from black with a flavo-testaceous or testaceous 
humeral patch (as in the type) to entirely testaceous. The following forms may be 
noticed :— | 
(1). Elytra black, with a transverse, rounded, or oblique humeral patch testaceous. 
(2). Elytra piceous or brown, with an oblique patch extending from the shoulders downwards and a large 
patch of variable size on the disc beyond the middle testaceous *, these markings sometimes confluent. 
(3). Elytra entirely testaceous. 
* The Mexican Xylophilus mentioned by me, antéa, p. 190, nota, belongs to this form of X. bicolor. 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 2, arch 1893. 3NN 
