OF WASHINGTON. 



107 



thorax, free from partially fused with thorax, the first 



episternum episternum nearly always fus- 



ed with the epi- 

 sternum. 

 Metanotum without metanotum with med- metanotum with med- 



median groove ian groove ian groove. 



Pseudonotum absent. pseudonotum present pseudonotum present 

 in metathorax in metathorax. 



EXPLANATION OF PLATES II-V. 

 (Drawings by the author.) 



Ax, axillary cord or vein; Cx, coxa; Cx.a, accessory coxa! plate; 

 Cx. P, coxal process ; El, elytron ; Epm, epimerum ; Eps, episternum ; 

 F, femur; G, median notal groove; H, posterior part of head; I.Ab.N, 

 first abdominal notum; K, katopleure; M, base of intersegmental mem- 

 brane; MD, muscle disc; A'', notum; P, parapterum; iP, first or an- 

 terior parapterum; 2P, second or posterior parapterum; PA, pleural 

 apodeme; Pcpiii, postepimerum ; Ph, phragma; Pn, pseudonotum; PR, 

 internal pleural ridge ; P.S', plural suture ; Rd, reduplication of posterior 

 edge of notum; S, sternum; S.a, accessory sternal plate (" vorplatte ") ; 

 Sp, first abdominal spiracle ; T, trochantin ; T. a, accessory plate of 

 trochantin; Tr, trochanter; IVP, wing process of pleurum. 



a, Notal process of first articular wing sclerite; b, notal process of 

 third articular wing sclerite ; c, lateral emargination of notum ; d, 

 accessory plate of mesothoracic wing articulation; e, accessory plate of 

 metathoracic wing articulation ; /, posterior metanotal plates of Spongo- 

 phora; g, posterior marginal membrane of metanotum of Spongophora; 

 h, posterior plate of microthorax in fig. 8; i, point of articulation of 

 pseudonotum to epimerum; ;, yoke plates in Blattella between meso- 

 notum and metanotum; k, anterior marginal ridge of notum; /, posterior 

 marginal ridge of notum; m, anterior muscle disc of notum; n, 0, p, 

 ridges on ventral surface of notum; q, yoke plates of Calosoma be- 

 tween mesonotum and metanotum. 



Fig. I. 



2 



3 

 4 

 5 

 6 



7 



Plate II. 

 Spodromantis guttata, microthorax and submentum, ventral 



view. 

 Spodromantis guttata, mesopleurum. 

 Ischnoptera hyalina, mesopleurum. 

 Spodromantis guttata, mesopleurum, internal view. 

 Byrsotria funiigata, mesopleurum, internal view. 

 Blattella germanica, metanotum, dorsal view. 

 Blattella germanica, metanotum, ventral view. 

 Byrsotria fumigata, propleurum, external view. 



