CLASSIFICATION OF INSECTS 307 



C. Prothoracic legs normal . . RAPHIDIIDAE 



CC. Prothoracic legs fitted for grasping ...... MANTISPIDAE 



BB. Prothorax normal. 



C. Wings clear, densely net-veined. 



D. Antennae filiform, without terminal knob. Lace wings. 



(Page 92) CHRYSOPIDAE 



DD. Antennae filiform, with terminal knob. Ant-lions. (Page 93 ) 



MYRMELEONIDAE 



CC. Wings more or less opaque, with many longitudinal but few cross 

 veins . HEMEROBIIDAE 



THE MECOPTERA 



This order includes only one family, having four membranous wings, fur- 

 nished with numerous veins. The head is prolonged into a beak, at the end 

 of which are the biting mouth-parts. Scorpion-flies. (Page 93) PANORPIDAE 



THE TRICHOPTERA 



This order includes but one family, having four membranous wings, fur- 

 nished with numerous longitudinal but few cross veins ; wings more or less 

 densely covered with hair ; rudimentary biting mouth-parts. Caddis-flies. 

 (Page 93) _ .. . . PHRYGANEIDAE 



KEY TO THE PLATYPTERA 



A. Body cylindrical, social insects with white, antlike bodies. White ants. 

 (Page 103) , .. . . .. . . . . . . . . . . TERMITIDAE 



A A. Body depressed, if cylindrical, not antlike. Nonsocial, louselike insects. 

 B. Antennae of not more than five segments. Bird-lice. (Page 106) 



Suborder MALLOPHAGA 

 C. Antennae exposed, consisting of three or five segments. 



D. With three-segmented antennae ; tarsi with one claw ; infesting 

 mammals only . ^rV . . . .... TRICHODECTIDAE 



DD. With five-segmented antennae ; tarsi with two claws ; infesting 

 birds only . . . .-..,.. . .'' ..; . . .. PHILOPTERIDAE 



CC. Antennae concealed in shallow cavities on underside of head, con- 

 sisting of four segments. 



D. Tarsi with one claw ; infesting mammals only . GYROPIDAE 

 DD. Tarsi with two claws ; infesting birds only . . LIOTHEIDAE 

 BB. Filiform antennae of more than five segments. 



Suborder CORRODENTIA 

 C. Wings well developed ; ocelli present in addition to the compound 



eyes. Bark-lice. (Page 105) PSOCIDAE 



CC Wings and ocelli wanting. Book-lice. (Page 105) . ATROPIDAE 



