322 Mr. Clark* j Obfervations on the Genus Oe/rrus, 



The miftake of hamorrhoidalh for Bovis arofe probably from their 

 fimilarity in description, in which they certainly interfere very much ; 

 though no two fpecies can be more diftincl when feen together than 

 thefe. This will ever be the bane of compilation in natural hif- 

 tory. 



it has been doubted whether thefe animals pofTefs any mouth: 

 Linnaeus exprefsly fays, " Os nullum punclis tribus ;" but when the 

 hairs are removed, which in every fpecies very much obfeure the 

 parts of the mouth, two clavated palpi are feen, and between them 

 the opening of the mouth ; and by laying open the veficular or 

 inflated part of the face, the continuation of it is vifible in the form 

 of a membranous haujlellum, which is generally coloured with forne 

 dark brown matter lodging on the infide ; though 1 confefs, after 

 repeated diileclions, I have not been able to trace this haujlellum far- 

 ther than the infide of the inflated part of the head, where it appears 

 to enlarge and terminate. 



Fabricius has minutely defcribed labia to the haujlellum, and 

 other apparatus to the mouth, which I have not been fortunate in 

 obtaining a fight of. At the fame time, I cannot help being fur- 

 prifed that he fTiould have overlooked the palpi, which he exprefsly 

 denies the exiflence of, though tolerably vifible even without the 

 aid of glafTes *. 



What farther circumftances I have obferved, in regard to the 

 generic characters of thefe infe&s, 1 have dated in the following 

 Latin defcriptions of them, and have alio added there what was 

 farther neceflary to complete the foregoing account, with fome 

 alterations in the fpecific defcriptions of them. 



I have, fince writing the above, been enabled to colled the ^7/0* 

 nyma more fully, and to examine all the authors who have treated 

 on this fubjecf, from the invaluable library of Sir Jofeph Banks, 



* Falricii Genera JnfeBcrum, 



whofe 



