Genera and Species o/" Blattid&e. 161 



radial vein bifurcate from near base, costal veins absent, 

 anterior ulnar simple, posterior ulnar simple or bifurcate, anal 

 field much reduced, anal vein 3trai<^ht, oblique, one axillary 

 vein. Wings similar in size, texture, and pubescence to the 

 tegmina ; posterior part of the wing reduced to a small lobe, 

 not pubescent, with one obsolescent axillary vein ; radial 

 vein simple, no costal veins ; median vein bifurcate from near 

 base, its anterior branch bifurcating near apex ; ulnar vein 

 bifurcate. Vena spuria present in both tegmina and wings. 

 Supra-anal lamina subquadrate, posterior border arcuately 

 emarginate. Subgenital lamina rounded, slightly irregular, 

 without styles. Cerci elongate, nine-jointed, apical joint 

 acuminate. Legs slender, long ; tibiae sparsely spined, the 

 spines on the posterior pair biseriately arranged ; femora with 

 genicular spines; tarsal claws minute, without arolia; no 

 pulvilli; posterior metatarsus longer than the remaining 

 joints. 



Cardax loilhyx, sp. n. (PI. IX. figs. 3-7.) 



$ . Fusco-hyaline ; tegmina with a sliglit iridescent sheen ; 

 legs testaceous. Front tibial with four apical spines, other- 

 wise unarmed ; mid tibiae with two spines near the base and 

 three apical spines ; hind tlbite with four spines along the 

 outer border and three apical spines. 



Total length 5'9 mm. ; length of body 3*8 mm. ; length 

 of tegmina 5 mm. ; greatest breadth of tegmina 2 mm. 



Peradeniya, Ceylon {A. Willey) ; several specimens. 

 Type in the British Museum ; co-type in the Oxford Museum. 



This is certainly one of the most remarkable cockroaches 

 known. In general appearance it is far more like a small 

 Neuropterous insect than like an Orthopteron, an effect 

 brought about by the similar texture and pubescence of the 

 tegmijia and wings ; this is a feature shown, to a limited 

 extent, by the genus llomopteroidea, mihi, but by no other 

 genera in the family. In the subfamily Corydiina3 the poste- 

 rior part of the wing does not fold up in a fan-like manner, but 

 merely doubles under the anterior part, which leads in some 

 instances to a reduction in size of the posterior part, so that 

 it becomes equal in size or even smaller than the anterior 

 part. In Cardax the reduction has proceeded so far that the 

 posterior part of the wing is represented merely by a small 

 functionless lobe ; and it is interesting to note that, correlated 

 with this reduction, is a parallel reduction of the anal field of 

 the tegmina. The anterior part of the wings is relatively 

 much larger than is usual in Blattida\ The venation of the 



Ann. (fc May. N. Hist. Ser. 8. Vol i. 11 



