272 Mr. R. Shelford's Studies of the BlattidcX. 



be with Archihlaita, Vollenb., as shown by the unarmed 

 femora and the structure of the tarsi ; the form of the 

 " epipleuron " is very different, in ArchiUatta this is formed 

 by a simple deflexion of the anterior part of the tegmen, 

 whereas in Miroblatta the area between the mediastinal 

 and radial veins is deflexed, but the mediastinal field itself 

 is in the same plane as the disc of the tegmen, forming in 

 repose a sort of flange ; I know of no parallel modification 

 of the tegraina in other Blattidte. The method of wing- 

 folding in MirolAatta is met with again only amongst the 

 Corydiinse. 



MiroUatta petro])hila, sp. n. (Plate XIV, figs. 4, 4ft.) 



(J. Elongate ovate ; dark castaneous. Head fuscous, front concave, 

 lower face rugose, clypeus flavo-testaceous, mouth parts castaneous ; 

 antennae longer than total length of body, a broad white annulus 

 before the middle, occupying twenty-one joints. Pronotum cas- 

 taneous, disc with strong elevated ridges in the form of a horseshoe, 

 giving off anteriorly two short diverging branches and laterally two 

 backwardly directed branches which are less strongly marked, a 

 median carina on the anterior cucullate part of the pronotum ; area 

 between the limbs of the horseshoe rugose, ridges and adjacent parts 

 black, a pair of orange spots on each side of the anterior carina and 

 another pair on each side of the limbs of the horseshoe-shaped ridge ; 

 scattered about the surface of the pronotum are numerous small 

 tubercles bearing erect set^. Tegmina castaneous, the radial vein 

 black. Wings flavo-hyaline, marginal field and apex suffused 

 with flavo-castaneous. Abdomen dark castaneous, paler at the base 

 above. Legs dark castaneous, apices of femora flavo-castaneous ; 

 formula of apical spines i, |, |, no genicular sjjines on anterior 

 femora. 



Total length 40 mm. ; length of tegmina 26 mm. ; pronotum 

 13 mm, X 16 mm. 



Mt. Santubong, 2500 feet, amongst rocks. One example. 



About half-a-dozen specimens of this cockroach were 

 captured by a native collector in August 1900; he stated 

 that they ran with great activity and that they were 

 incapable of flight. 



Genus Corydia, Serv. 



Corydia cccrulea, n. sp. 



(3 . Brilliant blue with metallic reflections. Head, pronotum and 

 anterior margins of tegmina and wings pubescent, antenna? fuscous, 



