INSECT A — COLEOPTERA, 
175 
for genera, nor do they stand in immediate connection with the forms 
taken as typical. Under these circmnstances, the author, in order to 
avoid the error of splitting too much, has chosen the plan of determin- 
ing a limited number of genera, but distinguishing all the variations 
which occur within them ; and noting, as sub-genera with their own 
names, those farther removed. 
First, the genera with five' distinctly jointed tarsi. 
I. Cylidrus, divided into two groups, ^ — 1. {Cylidrus, Spin.) with a 
concealed labrum: O. cyaneus, F., fasciatus, Lap., and two new species, 
C. abdominalis, from Brazil, halteatus, from the Cape ; and, 2. (Denops, 
Stev.) with the front of the head emarginated and the labrum free : 
albofasciatus, Charp. 
II. Tillus. — A. Claws twice toothed before the tips. — 1. (Tillus) Body 
slender, antennae long and serrated ; T. elongatus, to which T. hyalinus, 
Sturm, and bimaculatus, Don., are joined as varieties. — 2. Body slender, 
thorax constricted, antennae doubly pectinated : T. pectinicornis, new 
species, native country unknown. — 3. {Cymathodera, Gray) Antennae 
filiform, last joint gradually becoming pointed, not much longer than the 
preceding : Hopei, Gr., cylindricollis, Chevr., inornatus, Say, and four 
new: marmoratus from Mexico, prolixus and conflagratus from Orinoco, 
cingulatus from the Cape. — 4. Antennae shorter, sub-serrated, the last 
joint as long as the two preceding : T. compressicornis, new species 
from the Cape. — 5. {Macrotelus, Kl.) Antennae ten-jointed, the tenth 
as long as all the others together: terminatus, Say. — 6. {Tilloidea, 
Lap.) Antennae short and serrated, labrum transverse : T. rubricollis, 
Guer. {pubescens, Lap.), transversalis, Charp., unifasciatus, F., and a 
new species, notatus, from the East Indies. B. Claws with only one 
tooth before the tips. — 7. {Gallitheres, Dej.) The last joint of the labial- 
palpi transverse (quergezogen) ; peculiar to Madagascar : a. {Pallenis, 
Lap.) Antennae broader towards the tips, serrated from the fifth joint, 
tarsal joints of equal breadth, tips of elytra rounded continuously : 
tricolor, Lap., and two new species, aulicus and viduus. b. (Jodamus, 
Lap., Gallitheres, Spin.) Antennae broader and serrated towards the 
tips, the first two joints of the hinder tarsi somewhat compressed, elytra 
elongated and pointed : acutipennis, Lap. c. {Xylobius, Guer.) Antennae 
broader towards the tip, compressed, with the last joint rounded, tarsal 
joints of equal breadth, tips of elytra rounded continuously : azureus, 
KL, and three new species, venustus, longulus, pulchellus. d. Antennae 
as in c, tarsal joints and tips of elytra as in b : fastigiatus, new species. 
e. Antennae scarcely serrated near the tips, tarsal joints and tips of 
elytra as in ct : auricomus, new species. — 8. (Philocalus, Kl.) Palpi 
the same, antennae bluntly serrated, body elongated : sicccinctus and 
zonatus, from the Cape. — 9. (Gleronomus, KL) Antennae thickened 
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