368 INSECT A. 



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. 



^. striatum, OViv.; ^nobium pertinax, ¥a.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.; .^. mmutum, 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(l). 



The third and last section of the Serricornes, forming also 

 a last tribe, that of the Xylotrogi, is distinguished from the 

 two preceding ones, as we have already stated, by the entire 

 freedom of the head, and consists of the genus 



Lymexylox, 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 antennJE 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. 



Those, whose elytra are very short, and in the form of a little 

 scale, constitute the genus. 



Atractocerus, Palis, de Beauv. — Necydalls, Lin. — Lymexylon^ Fab. 



The antennae compressed and almost fusiform; thorax square; 

 abdomen depressed. 



A. necydaloides, Palis, de Beaux., Magaz. Encyclop.; Necy- 

 dalis brevicorniSf L.; Lymexylon abbreviatum, Fab.; Macrogas- 

 ter abbreviatuSy 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, 



(1) See Schosnh., Synon. Insect., I, 2, p. .101. Some of the species of FabriciuB 

 belong to the genus Cia. ' 



