hitherto confounded under the Name of Manth. 35 



^re the following, M.fpmofa, n. 9. M. bifp'mofa, n. 10. and M. aurha^ 

 ■iu 13. This lafl: is, in all probability, the male of the P ha/ma 

 Dracunculus, provided it has broad forelegs, and in general fkinny 

 margins on all its legs, which may eafily be determined by infpcc- 

 tion of the Lundian colle<f}ion in Copenhagen. The next in 

 order, Ph. Uneare^ is certainly at lead of the fecond family, and, pro- 

 bably, the male of my Ph. Obrtmanni, The Ph.fp'mfum and h'lfpino^ 

 fum belong certainly to the firft family, and are very nearly related 

 to the Ph, aircphkum and hcdicum. The laft mentioned arc alfo 

 males, of which the females are, perhaps, already known. In the 

 genus Phafma^ the males in general are very clearly diflinguifliablc 

 from the females. The fexual diflinclions may be taken with the 

 greateft advantage from thofe fpecics of which the males and fe- 

 males are known with perfefl certainty as belonging to each other. 

 Thefe are particularly my Ph, mevium and Ph, cduk. There arc, 

 indeed, fome genera in which it feems that the difference of the 

 fexes in rcfpeft to magnitude is only ohfcrvable in fome fpecies, and 

 not in the genus at large. I need not go fo far as to mention that 

 in the genus Cervus^ the flag, Cervus lUaphus, is greater than the 

 hind; and, on the contrar}', the roebuck, Cervus Capreohis^ is confi- 

 derably fmaller than the doe; fuch confiderations would carry me 

 too far from my purpofe. I will confine myfelf to infecls. Here wc 

 have the Bomhyx difpar, in which an inequality exifts between the 

 two fexes that may be called unexampled in this genus. It were 

 ufelefs to aflert that there is a natural genus among the Glrffata of 

 w^hich the fexes ai-e unequal in fize, and which ought to be fcpa>- 

 ratcd from the genus Bombyx, in the fame manner as the Lncani^ 

 where the fexes are of unequal magnitudes, are fcparated from the 

 more proportionate Paffal'u Yet, fetting afide all thefe minutire, wc 

 may affume it as a probable hypothefis, until the contrary be clearlv 

 |jroved, that the differences of moft, if not of all, the other fpecies ot 



F 2 Phafttut, 



