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REPORT ON ZOOLOGY, MDCCCXLII 
the white oak, — the beetle on the leaves, the larva in the stem. 
Hylobius pales, Hbt., lives in pine wood ; also H. picivorus, Germ., and 
Pissodes Strobi, Peck (nemorensis, Germ.), often destroying tracts of 
several thousand acres of wood. In gardens, Conotractelus nenuphar, 
Hbt. [argula, F.), is particularly detrimental, chiefly to plums, but also 
to several other fruit trees ; it pierces the fruit as soon as it is formed, 
and there lays its egg. The larva gnaws the fruit, which decays and 
falls off as soon as the larva is grown. The metamorphosis goes on in 
the ground. If these insects are numerous, no plums ripen. The same 
beetle causes, by its perforation, warty excrescences on the younger 
twigs, in which also larvas are found, and in consequence of the circu- 
lation of the sap being disturbed, the branches die above these gaUs. 
Calandra granaria and oryzce are destructive almost every where to 
the grain laid up in granaries, the latter not only to the rice, but also 
to the maize. Of Bark Beetles, the Hylurgus terebrans is found in the 
pitch fir ; H. dentatus, Say, in the red cedar ; Tomicus exesus. Say, in 
the pitch fir ; T. pini, Say, in different species of pines ; Scolytus pyri. 
Peck (not an Eccoptog aster, rather a Tomicus), in pear trees, in the sap 
of the branches, which die in consequence of its gnawing. 
Hornung (Entom. Zeit. p. 115) discovered a nmnber of Bark Beetles 
inhabiting Betel-nuts [Areca Tcatechu). Bostrichus dactyliperda, F., 
was most numerous ; B. palmicola and carpophagus, both allied to the 
preceding, occurred more rarely^ B. arecce, a small new species, was 
abundant. 
Brenthides. — Harris has given some information concerning the 
larva of the Brenthus (Arrhenodes) septentrionis (Ins. of Massachus. 
p. 60). When full grown, it is above 1" long, and scarcely V" thick; 
almost cylindrical, only somewhat flat beneath ; white, with the excep- 
tion of the last segment, which is horny dark brown, hollowed out 
obliquely posteriorly and dentated at the margin. The thoracic segment 
bears legs, and at the end next to the body there is a fleshy pseudo leg, 
from which it is very evident that it has no alliance with that of the 
CurcuUonidce, but rather with that of the Elateridce, or perhaps still 
more the Colydii. Farther comparison must show how far it may agree 
with the one or the other. According to the opinion of the author, the 
larva bores in the wood ; the female pierces with her thin proboscis the 
bark of the white oak, and lays an egg in each perforation. The larva 
makes cylindrical passages in the hard wood, which it always keeps free, 
as it pushes out the chips to the external opening with the last segment 
of its abdomen, so that these passages are easily detected. The change 
to the pupa takes place in the larva-passage. The pupa has upon its 
back transverse rows of small spines and sharp teeth, which probably 
serve to retain the cuticle when the beetle escapes. 
Harris would place the Brenthides at the end of the CurcuUonidce, 
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