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TEXT-BOOK OF ENTOMOLOGY 



single piece, in Campodea and Machilis there appears to be an 

 additional basal piece apparently corresponding to the stipes of the 

 A A' T; c 



FIG. 4fi. Various forms of mandibles. A, right and left of Termopsis. A' showing at the 

 shaded portion the "molar" of Smith. , Termesjiavipes, soldier; md, its inaudible. (', Panorpa. 



first maxilla, and separated by a faint suture from the molar or 

 distal joint. In Campodea there is a minute movable appendage 

 figured both by Meinert and by Nassonow, 

 which appears to represent the lacinia of the 

 maxilla (Fig. 48). Wood-Mason has observed 

 in the mandibles of the embryo of a Javanese 

 cockroach, Blatta (Panesthia) javanica, indi- 

 cations of " the same number of joints as in 

 that of chilognathous myriopods, or one less 

 than in that of Machilis." Also he adds: 

 " In both < larvae ' and adults of Panesthia 

 javanica a faint groove crosses the ' back ' of 



.4 



FIG. 48. Mandible of Campodea: I, prostheca or lacinia: 

 FIG. 47. Chiasofftuitkus g, galea; /, /, flexor muscles; t, extensor; /, r, retractor; rt, 

 grantii, reduced. Male. muscle retaining the mandible in its place. After Meinert, A. 

 After Darwin. extremity of the same. After Nassonow. 



the mandible at the base. This groove appears to be the remains of 

 the joint between the third and apical segments of the formerly 

 4-segmented mandibles." 



