28 SYNOPTIC KEY 



7(8) Twelve leg-bearing segments. A number of trunk 

 segments without legs. Maxillipeds absent. Dorsal 

 surface of the body covered with fifteen or sixteen 

 plates. (Pratt, 465.) Order Symphyla 



8(7) Rare small forms; trunk consisting of seven to ten 

 visible segments, with nine pairs of appendages. 

 (Pratt, 466.) Order Pauropoda 



Class I N S E C T A 



YOUNG STAGES AND WINGLESS 

 ADULTS 



1(2) With two pairs of conspicuous jointed appendages 

 (walking legs) and rudiments of a third pair on con- 

 secutive segments of the trunk; grubhke. Larvae of 

 Passalidae. (Comstock, 556; Lutz, 326.) 



Order Coleoptera 



With three pairs of conspicuous legs; body usually 

 divisible into head, thorax, and abdomen, antennae, 

 present; external wings or wing rudiments present 

 or absent; when present nearly or quite incapable of 

 movement but never fused in the median line. 3 



3(4) Legs not capable of being employed in locomotion^ 

 and rarely capable of movement; length always greater 

 than the width of the segment bearing them. Animals 

 usually quiescent; not feeding; abdominal wriggling 

 the only form of locomotion; wings or wing rudiments 

 usually present; body frequently inclosed in a cocoon 

 or cell or in the old larval skin. Pupae of insects with 

 complete metamorphosis. p. 42 



^ In a very few of the lower forms, the pupa becomes active and 

 walks about for a time before the pupal skin is shed; in most forms the 

 appendages are slightly movable just before the adult insects emerge 

 and are used in helping to free the body from the pupal skin. The larvae 

 and nymphs are frequently incapable of using their legs in locomotion 

 for a period after molting. This key does not cover all these cases. 



