10 Proceedings of the Royal Irish Academy. 



EXPLANATION OF PLATES. 

 Plate I. 



Fig. 



l.Pcripl%ii eta austrcdasice. Mandibles and tongue viewed from Ijehind. x 31. 



2, Mandibles closed, x 19. 



c, condyle ; g, ginglymus ; mp, pars molaris ; la, lacinia mobilis ; 

 liy, hypopharynx ; ten, tentorium ; x, y, z, sclerites on bypopharynx ; 

 Ex, extensor muscle ; L, long flexor ; S, sbort flexor ; In, muscle in 

 interior of mandible ; V, posterior muscle of tongue ; sal, salivary duct ; 

 rcep, left salivary receptacle. 



Plate II. 



1. Pervplaneta australasice. Eight maxilla seen from behind, x 28. 



2. P. australasice. Left maxilla seen from in front, x 28. 



3. P. australasice. Apex of right lacinia. x 56. 



4. Phylloclromia germcLnica. Apex of left lacinia, drawn to same scale as 



Fig. 3. 



car, cardo ; st, stipes ; pi, palp ; sc, sclerite at base of palp ; 

 ga, galea ; la, lacinia ; 'pr,'pr' , processes on apex of lacinia ; m, connect- 

 ing plate between lacinia and stipes ; ten, tentorium ; W, W , W" , cardo 

 muscles ; P, abductor of cardo ; G, G', stipes muscles ; D, E, H, L, N, T, 

 muscles of the palp ; B, muscle of galea ; A, Q, muscles of lacinia. 



Plate III. 



1. Periplaneta austrcdasice. Left side of labium viewed from behind, x 31. 



2. P. austrcdasice. Left side of labium : anterior ^dew. x 31. 



u, V, t, cervical sclerites ; sm, submentum ; me, mentum ; ga, galea ; 

 la, lacinia ; 2^i> palp ; 2W> palpiger ; S, muscle from u to epicranial 

 plate ; B, muscle from submentum to mentum ; I', E', muscles of 

 palpiger ; F, K, H' , muscles supplying basal segment of palp ; I' , muscle 

 of second segment of palp ; N' , M, muscles of terminal segment of 

 palp ; A', muscle of lacinia ; B', C, muscles of galea. 



