250 Mr. R. Shelford's Studies of the Blattid^. 



margined with yellow all round its border leaving a trefoil-shaped 

 black centre. 



Th. spedahilis, Burm. (Nepal, Ceylon, Malacca.) 

 (Type in Berlin Museum.) 



Two joints beyond the antennal tuft white. Pronotum with pos- 

 terior margin and with two antero-lateral spots yellow, the black of 

 the disc forming a cruciform figure. Ante-penultimate segment of 

 abdomen beneath yellow. 



Th. siMciosa, Wlk. (E. Indian Archipelago.) (Type in 

 Oxford Museum.) (Plate XIV, fig. 5.) 



ii. The Oriental species exclusive of spcctahilis, hitherto 

 included in the genus Thyrsocera, belong to two different 

 genera, viz. one in which the vena ulnaris alarum is simple 

 or ramose and an apical triangle present, Z^c??^^^!^?/rsocg?'a,Sss., 

 another in which the vena ulnaris alarum is ramose and 

 an apical triangle absent : for the latter species a new genus 

 is created and may be diagnosed as follows : — 



PSEUDOTHYRSOCERA, gen. nov. 



Similar to Pseudomops, Serv., but with the anterior ulnar vein of 

 the tegmina bifurcated instead of simple, and the pronotum truncate 

 behind instead of produced. Antennte more or less incrassated and 

 plumose in both sexes, whereas in Pseiulomops the antennae are not 

 always plumose in the male. Rami of the posterior ulnar vein of the 

 tegmina angulate ; ulnar vein of the wings ramose, but sending no 

 branches towards the dividing vein. 



The species to be included in this genus are : — 



1. P. scutigera, Wlk. 



PseudomoiJs scutigera, Walker. Cat. Blatt. B. M. p. 212 

 (1868). (Sarawak, Borneo.) 



2. P. 'pica, Walker, 



Pseudomops p)ica. Walker. Cat. Blatt. B. M. p. 213 

 (1868). (Sumatra and Singapore,) 



3. P. xanthophila, Walker. 



Blatta xanthophila. Walker. Cat. Blatt. B. M, p. 230 

 (1868). (Menado, Celebes.) 



The types of these are in the Oxford Museum. 



