VI CONTENTS OF VOL. XXFI. 



INSECT A. 



Coleoptera. 



Page 

 Two new species of the genus Helofa from British Bhotan. Described 



by C. RiTSEMA Cz 27. 



Sechs neue Lucaniden-Arten und eine nene Varietat. Beschrieben von 



W. MoLLENKAMP 44. 



Two new Malayan Lucanidae. Described by C. Ritsema Cz 189. 



Lepidoptera. 

 The evolution of colour in Lepidoptera. By Mr. M. C. Piepers ... I. 



MOLLUSC A. 



An undescribed 'Natica. By M. M. Schepman. — With 2 figures . . 188. 



Vol. XXII was issued in parts in the following order; 



N^s 1 and 2. — July 1900, Note I-X. 

 N° 3. — March 1901, Note XI-XVII. 

 N-- 4. — May 1901, Note XVUI. 



