238 Mr. R. Shelford's Shidies of the BlafMclv. 



the species in the genus T he fi anoint cr ij x ; in some of the 

 species the posterior ulnar vein of the tegraina is markedly 

 angled, in others it is not. The form of the "titillator" 

 in H. lateralis, Wlk. {= H. major, Br.) is shown in Plate 

 XV, fig. 2, and is seen to be very different from that in 

 Th. mthiojnca, Sss. ; unfortunately we know so little of the 

 structure of this organ in the Blattid^, that at present 

 we can make no use of it in generic distinctions. The 

 titillator of H. histrio, Burm., is almost the same as in 

 H. lateralis, Wlk. 



The synonymy of Hemithyrsocera histrio, Barm., is here 

 given : — 



Thyrsoccra histrio, Burm., Handb. Ent. ii, p. 499, n. 7 

 (1838). 



Blatta lateralis, Serv., Ins. Orth. p. 107 (1839). 



Phyllodromia inversa, Br., Nouv. Syst. d. Blatt. p. 96, 

 n. 8 (1865). 



Pscwlomops Jissa, Wlk., Cat. Blatt. B. M., p. 213 (1868). 



Theganopteryx jucunda, Sauss., Mel. Orth. ii, p. 52 

 (1869). 



Thyrsocera lincaticollis, Bol., An. Soc. Espah. xix, p. 302 

 (1890). 



The sub-genital lamina and adjacent parts in the male 

 are figured on Plate XV, fig. 1. 



Hemithyrsocera ignohilis, n. sp. 



$ . Differs from H. ferruginea, Br., in its smaller size ; the golden 

 lateral margins of the pronotum reach the anterior margin, but are not 

 curved inwards here to the extent that they are in ferruginea ; the 

 posterior legs and the tips of the cerci are ferrugineous. 



Total length 12-5 mm. ; length of tegmina 10 mm. 



No locality. (An identical specimen in the British 

 Museum comes from the Khasia Hills.) 

 One example (Oxford Museum). 



Genus Esc ALA, nov. 



Allied to Theganopteryx, Br., but the sub-genital lamina of the 

 male bearing an asymmetrical lobe which may be unarmed, or 

 armed with a series of hooks or replaced by a stout hook ; the right 

 style sometimes absent, the left style accuminate. Supra-anal 

 lamina produced, triangular, not projecting beyond the sub-genital 



