144 



BRISTLE-TAILS AND SPRING-TAILS. 



cies, and is common. Fig. 160, greatly enlarged, copied from 

 Templeton; Fig. 159, side view, see also Fig. 161, where the 

 mouth-parts are greatly enlarged, the lettering being the same, 

 md, mandibles ; mx, maxillae ; mp, maxillary palpus ; lb, labium ; 



169. Scales of Tomocerus. 



171. Scale of Lepidocyrtus. 



Ip, labial palpus ; Zc, lacinia ; g, portion ending in three teeth ; I, 

 lobe of labium ; sp, ventral sucking disk ; the dotted lines passing 

 through the body represent the course of the intestine; b, end 

 of tibia, showing the tarsus, with the claw, and two accessory 



spines ; a, third joint of the spring. 

 Fig. 162, lacinia of maxilla greatly 

 enlarged. Fig. 169, different forms 

 of scales, showing the great vari- 

 ation in size and form, the narrow 

 ones running into a linear form, 

 becoming hairs. The "markings 

 are also seen to vary, showing 

 their unreliable character as test 

 objects, unless a single scale is 

 kept for use.) 



Lepidocyrtus. Abdominal seg- 

 ment unequal, with simple hairs 

 and scales. Antennae long, four- 

 jointed. Eyes eight in number 

 on each side. (Fig. 170, L. albi- 

 nos, an European species, from Hardwicke's "Science Gossip." 

 Fig. 171, a scale. Two species live in New England.) 



Podura. Abdominal segments subequal. Hairs simple, no 

 scales. Antennae four-jointed, shorter than the head. Eyes 



170. Lepidocyrtus. 



