250 Rev. Mr. KirbyV Obfervations upon Infers that prey upon Timbtr, 



and the wood, upon the furface of which they ufually trace in 

 feeding, what Linnaeus calls pinnated labyrinths, in which a num- 

 ber of lateral lines, neariy parallel with each other, form right angles 

 on each fide, with a central one ; and thus the bark is finally fepa- 

 rated from the wood. Moft trees, I imagine, have a particular 

 fpecies of this genus affigned to them. Thus Ips piniperdus attacks 

 the fir. Ips Scolytus, the elm. Ips niger fa), 1. grifeus fb), I. riifef- 

 cens fc)y and, I believe, /. nebulofus (d)^ undertake the barking of the 

 a(h. Ipsfufcus (e), and probably more fpecies, feed upon the oak. 

 Even flirubs do not efcape, for wliin or furze (Ulex ewopaus) is 

 preyed upon by the minute Ips rhodoi:la£fyIus(f), which I have fre- 

 quently taken coming out of the larger flicks of a dead whin-fence 

 in my own garden. Next to thefe come the Ptini ; feveral fpecies 

 of which are found in wood. I meet with Pti/ius iejjelhitiis in the 

 willow, and I believe it will attack deal or any foft wood. It is 

 one of thofe infects that is called the death-watch, fro:n a certain 

 found which it makes at regular intervals refembling the clicking 

 of a watch, which, the vulgar fuperflitioufly imagine, forebodes the 

 death of fome perfon in the houfe in which it is heard. The 

 Piinus peSiinkornis aUb, and Pt. cylindricus fg), feed in the fame tree.. 



(n) Niger. 24. 1, fubcylindricus, niger, thorace punftulato, elytris crenato-ftriatis, plaa- 

 tis piceis. Matfliam M.S. 



(i) Grifais. 9. I. ferrugineus, capke nigro, fupra ferrugineo teftaceoque varius. Ibid. 



(c ) Rufefcens. 10. I. fubtus luteus, fupra rufus, elytris luteo nebulofis. Ibid. 



(d) Nfbuhfus. 8. I. fubvillofus, corpora nigro cineieoque vario. Ibid. Bojlrichus 

 Fra.vini : ater fufco cinereoque varius, elytris punflato ftriatis, antennis teftaceis clava 

 cinerea acuta, Pjnz. Fn. Inf. Genn. Inil. n. 66. tab. 13. 



(e) Fufcus. 5. I. fufcus, antennis pedlbufque teftaceis; elytris retu(is confertius punc- 

 lulatis. Marfliam M. S. 



(f) Rhoilo.hBylus. 22. I. niger, villofus totu5, plantis rufis. Ibid. 



(g) Cyt'mdnctis. 6. Pt. fubcylindricus fufco ferrugineus ; thorace gibbo laeviufculo ; an- 

 tennis pedibufque rufefcentibus. Ibid. 



7 But 



