INTRODUCTION 



of thirty-two quarto pages is illustrated l)y tour \ery sti'ikiiig 

 coloured plates which show the development of the fly and struc- 

 tural details, hotii external and intei-nal, i>\' ilic Hy and larva 

 (fig. 2). The author gives a somewhat ddailiMl account of the 



V:f^.(tj,c:<Xr, 



-iV Fig. 2. Kcprjduction of Plate I of Gleichen's Gc-schiclitc dcr <j,inciuc)i 



( Stiiheiiiiit'ne, 1790. 



1—2 



