90 MADEIRAN COLEOPTERA. 
239. Ptinus mauritanicus. 
Ptinus mauritanicus, Lucas, Col. de V Algérie, 208 (1849). 
— — , Woll., Ins. Mad. 261 (1854). 
Inhabits Madeira proper, occurring sparingly at low elevations. 
§ IL. Corpus plus minus sphericum squamosum apterum, prothorace 
convexo, scutello vie observando: antenne ad apicem plus minus 
subclavate : tarsi breviusculi subacuminati, art** 4 bascos longitu- 
dine subcequalibus. (Ptini aberrantes, sed in insulis Maderensibus 
typrce.) 
(Genus TRIGONOGENIUS, Gay et Soler, 1849.) 
240. Ptinus Dawsoni. 
Ptinus Dawsoni, Woll., Ins, Mad. 263. tab. v. f. 5 (1854). 
Inhabits the Central and Southern Dezertas, occurring under stones 
and (amongst lichen) in the crevices of the weather-beaten rocks. 
Rare. 
241, Ptinus nodulus. 
Ptinus nodulus, Woll., Ins. Mad. 265 (1854). 
Inhabits the mountains of Porto Santo, being found in similar 
places as the last species. 
242, Ptinus pinguis. 
Ptinus pinguis, Woll., Ins, Mad, 264 (1854). 
Inhabits Madeira proper, principally at rather low elevations. 
Rare. 
243. Ptinus orbatus. 
Ptinus orbatus, Woll., Ins. Mad. 264, tab. v. f. 6 (1854). 
Inhabits Madeira proper, in rotten wood ; and is hitherto unique. 
244, Ptinus pilula. 
Ptinus pilula, Woll., Ins, Mad. 266 (1854). 
Inhabits Madeira proper ; and may perhaps be merely a variety of 
the P. albopictus. 
245. Ptinus albopictus. 
Ptinus albopictus, Woll., Ins. Mad. 267. tab. v. f. 4 (1854). 
longicornis, Woll., Ins. Mad. 270 (1854). 

Inhalnts all the islands of the Madeiran Group, occurring within 
the pithy stems of plants (especially of the Silybum Marianum, 
