SINOXYLON.—XYLOPERTHA. 215 
more than half their length. The labrum (as is usual in other genera of this family) is 
fringed with golden hairs. Of the two specimens we have received, one has the granu- 
lations of the front of the thorax rather more pronounced than the other, and three of 
them form denticules; the mandibles are simple, but notched at the tip. The elytra 
and whole body are black without any tendency to redness. The suture is depressed in 
the declivity ; and there is there a faint sutural stria ; the apex is evenly punctured, like 
the rest of the elytra. 
This is the only American species of Stnorylon I have yet seen, 
XYLOPERTHA. 
Xylopertha, Guérin-Méneville, Ann. Soc. Ent. Fr. 1845, Bull. p, 17. 
Sinoxylon, sec. A, Horn, Proc. Am. Phil. Soc. 1878, p. 541. 
Aylopertha differs from Sinorylon in having the three terminal joints of the antenne 
elongate and arranged in sequence; in Sinoxylon, of which S. muricata, an Austrian 
insect, is the type, the same joints are arranged in a perfoliate club, the first and 
second joints of the club being transverse, much developed internally. The type of Xy/o- 
pertha is X. sinuata, also from Austria ; ‘and the North-American species referred by 
Horn to Sinoxylon, Dufts., must be brought into it, or a new genus be made for them, 
for which there is no present occasion. About fifteen species are catalogued of this 
genus, widely distributed, and many more undescribed exist in collections; but no 
doubt some of these will present generic differences from the European type. I have 
not seen species of this genus in which the apex is so abruptly truncate as in 
Sinoxylon. 
1. Xylopertha sericans. (Tab. X. fig. 21.) 
Sinoxylon sericans, Lec. Proc. Ac. Philad. 1858, p. 73, ¢ 
Sinoxylon asperum, Lec. loc. cit., 2. 
Sinoxylon sericans, Horn, Proc. Am. Phil. Soe. 1878, p. 542°. 
Sinoxylon mexicanum, De}. (Sallé coll.). 
Hab. Nortu America, Texas !, California peninsula !,—MeEx1co, Cordova (Sallé, 3 2), 
Presidio (Forrer, 3 2), Minas Viejas (Dr. Palmer, 3 2); GuatEMALA, San Geronimo, 
Zapote (Champion); Honpuras (d Sallé coll.); Panama, Tolé (Champion). 
This species is, I have no doubt, the S. sericans of Horn and Lec. ; but the expression, 
“The elytral punctures becoming gradually coarser from the base to the declivity,” 
affords me some perplexity, as the reverse is the case here. The curious development 
of the left mandible into a horn-like process in the male leaves little doubt on the 
subject. The Guatemala specimens are rather larger and darker, the Honduras one 
