250 Microscopical Essays. 



In general the male is fmaller than the female. The antennas 

 of the male are, for the molt part, larger than thofe of the female. 

 In fome moths, and other infects which are furmmed with fea- 

 thered antennae, the feathers of the male fly are large and 

 beautiful, while thofe of the female are fmall, and fcarce to be 

 perceived. Some male beetles are furnifhed with a horn, which 

 is wanting in the female. 



fc Pleraque infectorum genitalia fua intra anum habentabfcondita, 

 et penes folitarios, fed nonnulla penem habent bifidum : cancri 

 autem et aranei geminos, quemadmodum nonnulla amphibia, et 

 quod mirandum in loco alieno, ut cancer, fub bah caudse. 

 Araneus mas palpos habet clavatos, qui penes funt, juxta os 

 utrinque unicum, quae clavae fexum nec fpeciem diflinguunt ; et 

 fcemina vulvas fuas habet in abdomine juxta pectus ; heic vero 

 fi unquam vere dixeris : res plena timoris amor, fi enim procus in- 

 aufpicato accefferit, fcemina ipfum devorat, quod etiam fit, fi non 

 llatim fe retraxerit. Libellula fcemina genitale fuum fub apice 

 gent caudae, et mas fub pectore, adeo ut cum mas coll urn fcemina 

 forcipe caudae arripit, ilia caudam fuam pefctori ejus adplicet, ficque 

 peculiari ratione connexae volitent." 



Infects are either oviparous or viviparous ; or, in other 

 words, the fpecies is perpetuated, either by their laying of eggs, 

 or bringing forth their young alive. The former is the more 

 general cafe ; there are but few inftances of the latter. Thofe 

 infects which pafs through the different transformations already 

 defcribed, cannot propagate till they arrive at their imago or per- 

 • feci: ftate ; and we believe there is feldom any conjunction of the 

 4 fexes 



