322 Mr. Clark'j Obfei-vations on the Genus Oeflrus. 



The miftake of hri-morrboidalii for Bovis arofe probably from their 

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

 tliough no two fpecies can be more diftinct when feen togetlier than 

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

 tory. 



It has 'htcn doubted whether thefe animals pofTefs any mouth : 

 Linnaeus exprefsly fays, " Oi nullum punSlls iribus ^ but when the 

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

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

 the o|7ening 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 haujlcllum^ which is generally coloured with fome 

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

 repeated diffedions, 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 iight of. At the fame time, I cannot help being fur- 

 prifed that he fliould have overlooked the ^a^/, which he exprefsly 

 denies the exiflence of, though tolerably vifible even without the 

 aid of glaffes *. 



What farther circumftances I have obferved, in regard to the 

 generic charafters of thefe infedls, I have ftated in the following 

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

 farther neceflaiy to complete the foregoing account, with fome 

 alterations in the fpecific defcriptions of them. 



I have, fince writing the above, been enabled to colled \\\zfynO' 

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

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



* FabTtcli Genera InftBorum. 



whofe 



