Mr. R. Shelford on the Studies of the Blattidac, G53 



O. . Similar ; supra-anal lamina trigonal ; tegmina more heavily 

 suffused with castaneous. 



Ootheca chitinous, carried with the suture uppermost, sides and 

 base multicarinate, the carinae produced posteriorly to form minute 

 teeth. 



Total lengths 10 mm. ; length of body (^ ) 9 mm., (?) 8 mm. ; 

 length of tegmina 8"5 mm. ; pronotum 3 mm. x 3"5 mm. 



Hob. ? Kamerun (Stettin Mus., type ; coll. Bolivar ; 

 Berlin Mus.) ; French Guinea, Kouroussa (Paris Mus.) ; 

 Portuguese Guinea, Bolama, Rio Cassine (Fea) (Genoa 

 Mus., Oxford Mus.); Fernando Po, Basile (Fea) (Genoa 

 Mus.) ; Biafra, Cabo S. Juan (Escalera) (Madrid Mus.) ; 

 Congo State, Kaserjga Kalumba (Sheffield Neave) (Musee 

 du Congo). 



One of the Portuguese Guinea examples was found in 

 a Termites' nest. The Biafra specimens are much darker 

 than those from other localities ; in the Kamerun examples 

 the pronotal vittae tend to become obsolete. 



iii. Diagnosis of Hemithyrsocera, Sauss. (Sub- 

 family Pseudomopinae). 



Sexes similar or dissimilar. 



Vertex of head not covered by the pronotum. Antennae setaceous 

 but occasionally incrassated or plumose. Pronotum trapezoidal, 

 posteriorly produced obtusely. Tegmina and wings in £ always 

 exceeding the apex of the abdomen ; in the 9 the tegmina and 

 wings resemble those of the £ , or in a few species the tegmina are 

 reduced to quadrate lobes and the wings are rudimentary. Discoidal 

 sectors of tegmina longitudinal. Ulnar vein of the wing simple, 

 bifurcate, or rarely trifurcate ; apical triangle variable but usually 

 much longer than broad and with ill-defined boundaries, not cutting 

 off the apex of the ulnar vein from the outer margin of the wing. 

 Medio-discal and medio-ulnar areas narrow. Subgenital lamina of 

 the £ and styles usually very asymmetrical. Femora strongly 

 armed, front femora armed after Type A. Ootheca a membranous or 

 coriaceous capsule carried with the suture on one side. 



Type of the Genus : Thyrsocera histrio, Burm. 



Geographical distribution — The tropical and sub-tropical 

 regions of the world. 



Every variation of which the apical triangle of the wing 

 seems capable is presented in this genus ; it may be very 

 narrow and almost inconspicuous (e.g. histrio, Burm., 



