COLEOPTERA. LYMEXYLONID.E. 275 



is very long and slender, with the first segment after the head di- 

 lated into a large hood, and the terminal segment produced into a 

 large obtuse lobe (^fig- 30. 19.) copied from Ratzeburg, tab. 2. 

 fig. 23. B. 



The genus Hylecoetus comprises the Cantharis Dermestoides Linn. : 

 a long reputed British species also distinguished by the remark- 

 able filamentous structure of the third joint of the maxillary palpi in 

 the males {fig. 30. 21. maxilla $ ). It is found in oak trees, which it 

 perforates in the same manner as the preceding. M. T. Desvignes, 

 however, who recently discovered the species in Sherwood Forest, 

 and to whom I am indebted for a specimen, saw them flying round 

 one of the old birch trees, upon which they alighted, and then ran 

 quickly up and down the bark. Its larva, copied at Jig. 30. 23., 

 from Schellenberg' s EntomologiscJie Beytrage. Winterthur, 1802. 4to. 

 tab. 1. ; (a work of great rarity, and which I have been only able to 

 meet with in the library of the Natural History Society at Berlin) has 

 a remarkable protuberance, or huncii, upon the first segment, and a 

 long horn upon the back of the terminal one. Its pupa, from the 

 same work, is represented at Jig. 30. 24. Sturm has given another 

 figure of this larva (Deidchsl. Faun. v. xi.) ; and, more recently. Dr. 

 Ratzeburg has published figures of the same insect in its different 

 states {Die Forst-Lisecten, vol. i. tab. 2. f. 25, 26., with details). The 

 pupa of H. barbatum, also figured by Schellenberg, is similar in form, 

 but the elytra are shorter. The same author has also represented the 

 details of these species. Bechstein and Scharfenburg have likewise 

 published a long account of the economy of this genus ( Vollstandige 

 Naturgesch. der Schadlichen Forst- Insect. Leijiz. 4:to. 1805.). Dr. Perty 

 (Delect. Animal. Articul. Bras. pref. p. 8.) states that the largest 

 species of this genus (H.. brasiliensis Dej.) is found upon fungi, in 

 which it forms long cylindrical burrows; and that H. cylindricus 

 JDej.^ which varies greatly in size, enters at night into houses, being 

 attracted by the lights. 



The exotic genus Atractocerus is remarkable for the very minute 

 size of the elytra, leaving the wings exposed, and not so long as the 

 flattened abdomen (fig. 31. l. Atractocerus from Brazil). It com- 

 prises very few species, the type being the Necydalis brevicornis Linn. 

 The typical species is presumed, by M. Palisot de Beauvois, to reside 

 in wood; but Perty informs us that the habits of A. brasiliensis are 

 similar to those of Hylecoetus cylindricus, mentioned above. The 



T 2 



