1889.] 3(57 



ventral plate is the subgenital lamina ; this is the 9th of the abdominal 

 sterna in the $ and the 7th in the <j> , and its structure is of great 

 importance in distinguishing the genera. The subgenital lamina 

 sometimes bears (in the <^) a pair of pointed processes, called styles. 



The Blattidce deposit their eggs enclosed in a capsule, the ootheca, 

 the form of which varies in different genera, and the ? carries it, about 

 for some time partly extruded. 



In using the terms anterior, posterior, &c, the insect is supposed 

 to have the wings spread out. 



Table of G-eneea. 



1 (4) Small size. Subgenital lamina ? undivided. Elytra, when present, with 



most of the branches of the radial vein simple (fig. 1). 



2 (3) Supra-anal plate £ $ rounded and very narrow'. Elytra, when present, with 



the ulnar vein contiguous at the base with the radial vein ; and the latter 

 beyond the middle with branches on both sides. Wings, when present, 

 have an apically dilated folding area (fig. 1, a ar) i. Ectobia. 



3 (2) Supra-anal plate $ $ triangularly produced. Elytra with the ulnar vein free 



from the base ; radial vein not branching posteriorly. Wings with no 

 apical area ii. Phyllodromia. 



4 (1) Large size. Subgenital lamina ? divided into two lateral lobes. Elytra, 



when present, with most of the branches of the radial vein furcate (fig. 2)... 



iii. Periplaneta. 



i.— ECTOBIA, Westwood (fig. 1). 



This genus and Phyllodromia are at once distinguished by their 

 much smaller size as compared with Periplaneta, and the venation of 

 the elytra easily separates Ectobia from Phyllodromia. 



Brunner includes with this the genus Aphlebia, Br., in the tribe 

 Ectobidce, but we have no British species of the genus Aphlebia, though 

 their distribution in Europe may justify us in hoping that two of the 

 species, A. maculata, Schr., and A. punctata, Meg., may turn up here ; 

 they should be looked for under dry leaves, &c. 



Table of Species. 



1 (2) Pronotum with the disc fuscous or blackish with pale margins 



1. lapponica, Linne. 



2 (1) Pronotum with the disc testaceous (exc. E. ericetorum, var. nigripes). 



3 (4) Small size, colour griseous. Elytra truncate in $ 2. Panzeri, Steph. 



4 (3) Larger size, colour stramineous. Elytra longer than the abdomen (??■•• 



3. livida, Fabr. 



1. — Ectobia lapponica, Linne. 



Blatta lapponica, Linne, Eaun. Suec, p. 863; {Ectobia) Eiscber, Orth, 



Europ., p. 105, tab. vii, figs. 13—15. 

 Ectobius lapponicus, Steph., Mandib., vi, p. 46, tab. xxviii, fig. 7. 

 Ectobia lapponica, Brunner, Prod, der Eur. Orth., p. 31, fig. 7. 

 Ect. perspicillaris, Turton, Steph , Mandib., vi, p. 47, non Fuessly. 



II 2 



