218 AN INTRODUCTION TO ENTOMOLOGY 



N. Prothorax much longer than the mesothorax; 

 front legs fitted for grasping prey. (Mantidae). 



p. 230 Orthoptera 



NN. Prothorax not greatly lengthened. 



O. Cerci present; antennas usually with more 

 than fifteen joints, often many-jointed. 

 P. Cerci with more than three joints. 



Q. Body flattened and oval. (Blattidae). 



p. 230 Orthoptera 



QQ. Body elongate. 



R. Head very large. (Termopsis). p. 273. 



ISOPTERA 



RR. Head of moderate size. p. 268. 



Grylloblattid^ 



PP. Cerci short, with one to three joints. 



Q. Body linear with very long linear legs. 



(Walking-sticks), p. 230 ... Orthoptera 



QQ. Body elongate or not, if elongate the 



legs are not linear. 



R. Body elongate; front tarsi with first 



joint swollen, p. 338. . .Embiidina 



RR. Front tarsi not enlarged. 



S. Minute insects, less than 3 mm. 

 in length; antennae nine-jointed. 



p. 270 Zoraptera 



SS. Larger insects; antennae usually 

 more than nine- jointed. (White-ants) . 



p. 273 IsOPTERA 



00. Cerci absent; anteimae usually with eleven 



joints, p. 464 COLEOPTERA 



HH. Antennae short, not pronounced; larval forms. 



I. Body cylindrical, caterpillar-like. p. 550.MECOPTERA 



II. Body not caterpillar-like. 



J. Mandibles sickle-shaped; each mandible with a furrow 

 over which the maxilla of that side fits, the two forming 

 an organ for piercing and sucking. (Ant-lions, aphis- 

 lions, hemerobiids). p. 281 Neuroptera 



JJ. Mouth-parts not of the ant-lion type. 



K.. Larva of Raphidia. p. 281 Neuroptera 



KK. Larvae of beetles, p. 464 Coleoptera 



EEE. Mouth-parts haustellate, fitted for sucking; mandibles not 

 sickle-shaped. 

 F. Body covered with a waxy powder or with tufts or plates of wax. 



(Mealy-bugs, Orthezia). p. 350 Hemiptera 



FF. Body more or less covered with minute scales, or with thick- 

 long hairs ; proboscis if present coiled beneath the head. (Moths) . 



p. 57 1 Lepidoptera 



FFF. Body naked, or with isolated or bristle-like hairs. 



G. Prothorax not well developed, inconspicuous or invisible 



from above, p. 773 Diptera 



GG. Prothorax well developed. 



H. Last joint of tarsi bladder-like or hoof-like in form and 

 usually without claws; mouth-parts forming a triangular 



unjointed beak. p. 550 Thysanoptera 



HH. Last joint of tarsi not bladder-Uke, and furnished with one 

 or two claws; mouth-parts forming a slender; usually 

 jointed beak, 

 I. Beak arising from the front part of the head. p. 350. 



Hemiptera 



II.Beak arising from the back part of the head. p. 394. . . 



. HOMOPTERA 



