482 Prof. Dr. C. Mereschkovsky on 



nests. An exception, however, appears to be in C. genneserce, 

 Carp., described from Galilee, where it was discovered living 

 under stones in a salt-spring (Carpenter, 1913). 



Appended are some notes relating to the occurrence of 

 C. buxtoni kindly supplied by Mr. Buxton, to whom my 

 thanks are due for giving me the opportunity of examining 

 the material : — 



" Freetown, Sierra Leone, 19. vi. 1917. 



" Cyphoderus collected from a termites' nest, in which they 

 occurred in great numbers. The nest was a hard mud turret 

 18 inches high on the golf-course, and had been made appa- 

 rently by Eulermes suspensus, Silv., which inhabited it in 

 immense numbers. The nest also contained right in its middle 

 a colony of Pericapritermes urgens, Silv., workers, soldiers, 

 and winged sexual forms, and a few Basidentitermes potens, 

 Silv., of which I only secured nasutes. The termites have 

 been named by Prof. Sil.vestri." 



LlTERATUEE. 



Borner, C. "Neue Cyphoderinen." Zool. Anzeig. 1913, p. 274 et seq. 

 Carpenter, G. H. "A new Spring-tail from Galilee." Journ. & 



Proc. Asiatic Soc. ol Bengal (new series), vol. ix. no. 6, 1913, 



pp. 215-217. 

 Wahlgren, E. " Apterygoten aus Aegypten und dem Sudan." 



Results of the Swedish Zool. Exped.'to Egypt and the White 



Nile, 1901. No. 15. Upsala, 1906. 



LVII. — On some new Forms of Lichens. 

 By Prof. Dr. C. MERESCHKOVSKY. 



Physcia pulverulenta (Scheb.), Nyl., forma delicata, Mer. 



Thallus mediocris, pallide ochroleuco-cinereus, nudus vel vix pulveru- 

 lentus, laciniis quasi ut in typo, sed minoribus, tenuioribus. con- 

 cretis, marginibus subcrenulatis, centro ad margines lobulis micro- 

 phyllinis munitis. Apotbecia mediocria, vulgo l^-l'S millim., 

 2-6 haud superantes, marginibus tenuibus, saepe Miosis. — Corticola, 

 supra quercus. 



Spec. orig. in herb. Conservatorii botanici Genevse (vide 

 Tabulae Physcice pulverulentce). 

 Loc. Geneva (Helvetia). 



