Mr, Clark'j Obfervations on the Genus Oejlrus, 323 



whofe generous liberality in promoting ufeful refcarch by this in- 

 diipenlable aid can never be too much admired. 



The refult or* this enquiry has induced me with the greater rea- 

 dinefs to offer thefe remarks to the Society, from the irreconcileable 

 defcriptions and difficulties which will be found in the bed writers, 

 who have endeavoured to defcribe the prefent genus, 



I have omitted the reference to Ray, becaufe the description, if 

 meant for the CE. Equi % is hardly worth preferving. From the 

 " alls crebrls punclis^ one fhould luppofe the Tab anus pluvialis was 

 intended by this defcription. 



From the obfervations of Wohlfarht y " De vermibus per nares ex- 

 cretis" it appears not improbable that the CE. Ovis, under a fa- 

 vourable opportunity, and perhaps deprived of its ufual nidus, had 

 depofited its eggs in the human noilril, as I know of no otjier 

 larva of this kind that could fuftain the temperature of that fitu- 

 ation ; yet the figures given of the flies obierved by him do not 

 much refemble Oejlri*. ^^^^_ 



J. Leonhard Filch er (Difputatio Inauguralis. Llpfuv 1788) has 

 given an elaborate defcription of the OE. Bovis and Ovis, 



In the Anfangfgrunde der Ndturgefchlchte of Lejhe, the larva, tab. 9, 

 fig. 19, is that of the Equi ; while the fly (fig. 21) is the CE. Bovis, 



De Geer, who for excellent defcriptions and general accuracy 

 furpaffes, in^my opinion, nearly all the writers on thefe fubjects, 

 has rightly corrected Linnaeus by not confounding the Bovis and 

 Equi, but has unfortunately fallen into the error of confidering the 

 Bovis and the hcemorrhoidalis as the fame. Hijloire des Injectes, p. 297. 

 Genera et Species Infec7orum y p. 192. 



* Since the above was committed to the prefs, Dr. Latham has informed me of a cafe 

 related in the firft volume of the Medical Communications, in which infecls were removed 

 from the antrum maxillare of a woman, and are evidently, as Dr. Latham has fuppofed, the 

 larva of the (E. Bovis. 



T t 2 In 



