A58 SUPPLEMENT. 
All the forms were obtained together at Tlalpam, but from Amula and Amecameca 
only the typical form has been received. 
24 (a). Xylophilus appendiculatus. (Tab. XXI. fig. 9, ¢.) 
d. Moderately elongate, parallel, shining; the head (the eyes excepted), prothorax, and scutellum rufo- 
testaceous, the elytra black, with a transverse humeral patch yellow ; the antenne obscure rufo-testaceous, 
with the basal three joints yellow; the legs flavo-testaceous, with the hind femora (except at the base) 
black, and the hind tarsi and the apical third of the hind tibie infuscate; the under surface (the head 
and prothorax excepted) black; the entire upper surface thickly, moderately coarsely punctured, and very 
finely, sparsely pubescent, the pubescence not hiding the punctuation. Head rounded at the sides behind 
the eyes, the latter moderately large and rather widely separated; antenne slender, thickening out- 
wardly, very elongate, joint 2 stout, about half the length of 3, the latter shorter than 4, 4-10 not 
differing much in length, longer than broad, 11 stout, twice as long as 10, ovate, obliquely acuminate ; 
prothorax as long as broad, convex, with the sides parallel behind and slightly rounded in front, the disc 
with a very feeble arcuate depression in the middle behind; elytra nearly twice as wide as the 
prothorax, moderately long, parallel in their basal half, obliquely depressed on the disc below the base ; 
legs moderately elongate, slender ; the hind femora with a narrow pouch-like appendage along their inner 
edge ending abruptly a little before the apex (thus appearing angularly dilated), and a large rounded 
prominence on their anterior face towards the tip—this prominence being formed by a rounded lamellate 
process, which is abruptly twisted and bent downwards, and is only partly visible from above,—their lower 
face deeply concave beneath this ; the intermediate tibie deeply triangularly notched on their outer edge 
near the apex. 
Length 2} millim. 
Hab. Mexico, Amecameca in Morelos (Flohr). 
One specimen only of this extraordinary insect has been received. X. appendiculatus 
is coloured exactly like the typical form of X. dicolor, which occurs at the same locality ; 
but differs from it in its more elongate, more parallel shape, very elongate antenne, and 
extraordinary male characters. The hind femora( dé ) are greatly thickened towards the 
apex. X. guadrisignatus is the only other species of the genus known to me with the 
hind femora thickened on their anterior face in the male sex. 
30(a). Xylophilus obliquus, (Tab. XXI. fig. 10, ¢.) 
3. Elongate, parallel, slightly shining; the head pitchy-black, the prothorax brown, with the sides and base 
paler, the elytra obscure testaceous, with the apex and a rather broad oblique streak on the disc of each 
beyond the middle brown, the antenne, palpi, and legs testaceous ; the upper surface finely, rather densely 
pubescent, the pubescence partly hiding the punctuation. Head rather broad, minutely punctured, 
narrowly extended on either side behind the eyes, the latter very large, somewhat narrowly separated ; 
antenne long and slender, joint 2 very short, not half the length of 3, 3-5 very elongate (the other joints 
broken off); prothorax a little broader than long, much narrower than the head, narrowed in front, the 
disc deeply canaliculate anteriorly, and with a deep, transverse, subarcuate depression behind and a trans- 
verse groove on either side about the middle, the surface closely, minutely punctate; elytra elongate, 
nearly twice as wide as the prothorax, parallel for three-fourths of their length, densely, moderately finely 
punctate, the dise with a deep oblique groove extending from the shoulders inwards; legs very elongate 
and slender, the femora and tibiz unarmed. 
Length 2 millim., 
Hab. Mexico, Amecameca (fohr). 
One male example. In its elongate, parallel shape, this species approaches XY. argen- 
