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, Oliv.; Anobium pertinax, Fab.; Panz., lb. 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. paniceuvi. Fab; A. minutum. Id. ; Oliv. lb. 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 ax'e much lai'ger than those of the 

 labium, pendent, pectiniform or tufted in the males, and terminated 

 by a large ovoid joint in the females. The antennee are short, 

 slightly widened in tlie middle, and narrowed at the extremity. The 

 tarsi are filiform, and all the joints entire ; the four posterior long 

 and very slender. 



Those, 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^YoXis. de Beauv., 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. 



Those, 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 the species of Fabricius 

 belong to the genus Cis. 



