The Tiam'' genera which are eiinunierated, rather 

 tha?! described in ivte-cquart' s papers are raostly 

 irreco£nizable because the diagnoses do not con- 

 tain arrv"- characters referring to the inore 

 irnoortant structures, and the characters which have 

 been used, and nearly all are taken from the 

 co'' oration, and therefore only are aoplicable by 

 coiparison, are ambiguous, slight attention havinp 

 been paid to the considerable difference in the 

 co I oration of the tv;o sexes of same species as it 

 occurs at least in the mos t numerous groups of the 

 farnily. He nce the descriptions car^ equally fit 

 one, tv7o or nore distinct species and of ten are 

 the two sexes of the sa^ie species tre a te d as 

 different species under tv.' o different nares. 



