- LAMOSACCUS. 281 
LAMOSACCUS. 
Lemosaccus, Schonherr, Cure. Disp. Meth. p. 50 (1826) ; Gen. Cure, iii. p. 625; op. cit. vi. 1, 
p- 68 (part.) ; Lacordaire, Gen. Col. vii. p. 13; Leconte, Proc. Am. Phil. Soc. xv. p. 223. 
The generic name Lemosaccus has hitherto been used to include a heterogeneous 
assemblage of species which will have to be separated sooner or later (as noted long 
ago by Lacordaire):—(1) Lemosaccus, s. str., confined to America, and of which 
L. plagiatus (Fabr.) may be taken as the type; (2) LZ. pruinosus, Blanch., L. variegatus, 
Blanch., and other Chilian and Brazilian forms*; (3) all the Australian and Malayan 
forms. In JL. plagiatus and its American allies the elytra are lobed at the base on 
each side of the scutellum; the rostrum is rugulose and dull in the ¢, and shining 
and cylindrical in the 92, the scrobes descending to beneath the eyes; the antenne 
are short, inserted near the middle of the rostrum, the club nearly or quite as long as 
the funiculus; the anterior coxee are more or less widely separated; the metasternal 
episterna are broad; the ventral sutures are straight; the pygidium is largely deve- 
loped and fully exposed, in the ¢ divided into two segments (the upper one being the 
propygidium of Lacordaire), in the @ consisting of one segment only; and the tarsal 
claws are very slender. In ZL. prutnosus and its allies the elytra are not lobed in front ; 
the antenne are inserted near the base of the rostrum, at least in the @; the scutellum 
is elongate; the anterior coxe are contiguous; the metasternal episterna are narrow ; 
the ventral sutures 2-4 are slightly curved at the sides; the pygidium is rather 
narrowly exposed ; and the tarsal claws are comparatively stout. In ZL. electilis, Pasc., 
L. brevipennis, Pasc., and the numerous other Australian species I have seen, the elytra 
are hollowed at the base; the antenne are inserted near the middle of the rostrum ; 
the anterior cox are more or less separated; the metasternal episterna are narrow ; 
the second ventral segment in both sexes is angularly produced on each side posteriorly, 
almost as in Tychius and Sibinia; the pygidium is large and exposed; and the tarsal 
claws are very slender. In all these insects the legs are rugose, short, and strongly 
retractile; the anterior femora, at least (except in some of the Australian forms), are 
toothed; and the tibie are strongly hooked at the outer apical angle, as in Magdalis. 
The genus is well represented in Central America. Most of the specimens obtained 
by myself were beaten from the decaying branches of trees. 
qa. Anterior femoral tooth truncated or blunt. 
a. Anterior tibie arcuately dilated on the inner side beyond the middle ; 
prothorax very broad, strongly rounded at the sides; elytra with a 
large red humeral patch, this colour sometimes extending to the whole 
of the upper surface; pygidium carinmate . . - - ee ee es ruficornis, sp. 0. 
* Magdalis piprtzi and M, bicristata, Faust, from the Rio Grande do Sul, Brazil, are probably congeneric 
with these. 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 4, November 1903. 200 
