CLASSIFICATION OF INSECTS. 



59 



TABLE FOR DETERMINING THE ORDERS OF HEXAPODA.* 



(This table includes only adult insects.) 



A. Wingless or with rudimentary wings. 



B. Mandibles and maxillae retracted within the cavity of the head so 



that only their apices are visible. Page 63 Thysanura. 



BB. Mandibles and maxillee more or less prominent and fitted for 

 biting. (See BBB also.) 

 C. Head with long, trunklike beak. (Boreus.) Page 78. 



Mecoptera. 

 CC. Head not prolonged into a trunk. 



D. Louselike insects of small size ; body less than one sixth inch 

 in length. 

 E. AntenniK with not more than five segments. (Bird-lice.) 



Page 6g Mallophaga. 



EE. Antennae with many segments. (Book-lice.) Page 68. 



CORRODENTIA. 

 DD. Insects of various forms, but not louselike, and, except in 

 the case of some ants, with the body more than one sixth inch 

 in length. 



E. Abdomen with short, conical, compressed, many-jointed 

 caudal appendages. {Cockroaches^ Page 70. . .Orthoptera. 

 EE. Abdomen without jointed caudal appendages. 



F. Legs fitted for jumping. ( Wingless locusts, grasshopfers, 



and crickets^ Page 70 Orthoptera. 



FF. Legs fitted for running. 



G. Abdomen broadly joined to the thorax. 

 H. Body linear. ( Walking-sticks^ Page 70. 



Orthoptera. 

 HH. Body white and somewhat antlike in form. (Ter- 



mes.) Page f} Isoptera. 



HHH. Body neither linear nor antlike in form. ( Wing- 

 less Jirejly et al.) Page 85 Coleoptera. 



GG. Base of abdomen strongly constricted. (Ants et al). 



Page S5 Hymenoptera. 



BBB. Mouth-parts formed for sucking. 



C. Small abnormal insects in which the body is either scalelike or 

 gall-like in form, or grublike and clothed with wax. The waxy 



* See note at bottom of page 53. 



