COLEOPTERA. 
447 
divided anteriorly by a depression ; elytra with punctured striae. 
According to De Geer, it will permit itself to be roasted to 
death by a slow fire, rather than exhibit the least sign of life 
when it is seized. 
A. striatum, 0\iv.; Ajiobium pertinax,Fa.h.; Panz., Ib. LXVI, 
5. Very similar to the preceding, but smaller, and destitute of 
the yellow spots at the posterior angles of the thorax — very 
common in houses. M. Dufour has observed a number of ap- 
pendages round its pylorus which form a kind of strawberry. 
A. paniceum. Fab; A. minutum. Id, ; Oliv. Ib. II, 9. Very 
small; fulvous; thorax smooth ; elytra striated. It gnaws fari- 
naceous substances, and devastates our cabinets of Insects, if 
left undisturbed. It also establishes its domicil in cork*. 
The third and last section of the Serricornes, forming also a last 
tribe, that of the Xylotrogi, is distinguished from the two pre- 
ceding ones, as we have already stated, by the entire freedom of 
the head, and consists of the genus 
Lymexylon, Fab., 
Which we will divide as follows. 
In some, the maxillary palpi are much larger than those of the 
labium, pendent, pectiniform or tufted in the males, and terminated 
by a large ovoid joint in the females. The antennse are short, 
slightly widened in the middle, and narrowed at the extremity. The 
tarsi are filiform, and all the joints entire ; the four posterior long 
and very slender, 
Tliose, whose elytra are very short, and in the form of a little 
scale, constitute the genus 
Atractocerus, Palis, de Beauv . — Necydalis, Lin . — 
Lymexylon, Fab. 
The antennae compressed and almost fusiform ; thorax square ; 
abdomen depressed, 
A. necydaloides,VsX\^. de Beativ., Magaz. Encyclop.; Necy- 
dalis brevicornis, L. ; Lymexylon abbreviatum. Fab.; Macro- 
gaster abbreviatus , Thunb. This Insect is found in Guinea, and 
appears to differ but little from another species that inhabits 
Brazil, There is a second much smaller and perfectly distinct, 
enclosed in amber, that belongs to the Museum. A third is 
met with in Java. 
Tliose, in which the elytra are as long as the abdomen, or not 
much shorter, form two subgenera. 
Here, the antennae are compressed and serrated, the joints trans- 
versal ; thorax almost square. Such is the 
* See Schoenh,, Synon. Insect,, I, 2, p. 101. Some of tlie species of FabriciuS 
belong to the genus Cis. 
