n6 



CRABS AND INSECTS. 



Works on Neuroptera for further reference. 



" Synopsis of described Neuroptera of North America," H. A. 

 Hagen, "Smithsonian Miscellaneous Collections," vol. iv, No. I, 1862 ; 

 " Transformations and Anatomy of Corydalus Cornutus," Holdeman 

 and Leidy, " Memoirs American Academy," vol. iv ; " Immature State 

 of the Odonata," L. Cabot, " Catalogue of Museum Comparative Zo- 

 ology," No. 5, 1872; "Caddis-Worms and their Metamorphoses," 

 " Popular Science Review," July, i86S. 



FIG. 139. Praying mantis. 



Order III. Straight- Winged Insects (Orthopteral 

 General Characteristics. Insects having four straight. 

 narrow, net-veined wings ; metamorphosis complete ; about 

 5,000 species are known. 



