HEX A POD A 215 



N. Prothorax much longer than the mesc thorax; 

 front legs fitted for grasping prey. (Mantidas). 



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. (Blattidas). 



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 hnear 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; antennse 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-like, and ftunished 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 . . . 



.0 HOMOPTERA 



