362 Mr. H. Domsthorpe on 



Psilothrix nobilis, 111., and Dolichosoma lineare, Rossi. 



These two species, which are of a metallic-green colour, 

 much resemble Phytophaga. The former is very common 

 on flowers in the Isle of Wight, Chesil Beach, etc. 

 I have found that my lizards (1 Lacerta viridis; 2 Lacerta 

 muralis, v. tiliguerta ; and 2 Lacerta agilis) won't touch 

 the former species. 



Cleridjl 



Tillus elongahts, L. 



This beetle is very like a Zema, or Crioceris (Phytophaga). 

 It has two forms, a black, and a blue with a red thorax, 

 the latter being the more common of the two. In Zema, 

 L. melanopa has a red thorax, while the other species are 

 unicolorous. 



Tillus unifasciatuSy F., Tarsostemcs univittatus, Rossi 

 and Thanisimus formicarius, L. 



These three beetles are all very good mimics of the 

 fiercely stinging Mutillas. 



Necrohia and Corynetes. 



All the species of these two genera are much like 

 Phytophaga. The Cleridse are themselves mimicked by 

 other groups, so all these cases may be Mullerian, and not 

 Batesian mimicry. 



Lymexylonim:. 



Zymexylon navale, L. 



This beetle is somewhat like a Telephorus in appearance. 



Ptinim:. 



Niptus hololeucus, Fald., N. erenatus, F., Mezium affine, 

 Boield., and Gibbinm scotias, F. 



All these beetles bear a strong resemblance to spiders, 

 as do, more or less, the species of the genus Ptinus. 



At present we do not know the reason or the advantage 

 of this mimicry. Spiders are extremely liable to the 

 attacks of insectivorous foes. These beetles are found in 

 old houses, cellars, lofts, and similar places where spiders 

 abound. 



