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, maxilla j mp, maxillary palpus ; Ib, labium ; 



169. Scales of Tomocerus. 



171. Scale of Lepidoc^rtus. 



lp, labial palpus ; Ic, lacinia ; g, portion ending in three teeth ; ?, 

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

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

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



spines ; , 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 &quot;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. Antenna) long, four- 

 jointed. Eyes eight in number 

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

 nos, an European species, from Hardwicke s &quot;Science Gossip.&quot; 

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



Podura. Abdominal segments subequal. Hairs simple, no 

 scales. Antenna? four-jointed, shorter than the head. Eyes 



170. Lepidocyrtus. 



