Mr. R. Shelford 07i the Stndies of the Blattidae. 645 



Pseudomopine, would, following my erroueous views, fall 

 into the Ectohiinae. It is perfectly true that the simple 

 or bifurcate ulnar vein of the wings is an Ectobiine 

 character, there being but few exceptions {Anapledoidea 

 and one or two species of Anaplecta), but it occurs so 

 often amongst the Pseudoniojnnae, that taken by itself 

 it has no great diagnostic value. 



It was my intention to write a complete revision of the 

 Ectobiine genera, but circumstances over which I have no 

 control prevent me from accomplishing this piece of work, 

 either now or in the future, and I must content myself 

 with giving a definition of the Ectohiinae^ a revision of 

 one characteristic Ectobiine genus, Theganopteryx, Br., and 

 descriptions of a few critical species of Hemithyrsocera, 

 Sauss. I hope that my researches will enable other 

 orthopterists to recognise clearly the differences which 

 separate the two genera — a point in classification which 

 was never very clear before, and by that means to discern 

 the characters of the two subfamilies to which the two 

 genera belong. 



i. Diagnosis of the Sub-family Ectobiinae. 



Fully winged, or tegmina and wings reduced, or aborted, or 

 absent. Sexes similar or dissimilar. Vertex of head not covered 

 by pronotum, which is transversely elliptic or trapezoidal. Tegmina 

 with discoidal sectors longitudinal or oblique. Wings nearly always 

 with simple or bifurcate ulnar vein ; a triangular apical area is 

 invariably present except in those forms in which it has developed 

 into a large apical field, reflected when the wing is folded ; the 

 triangular apical area is typically defined very clearly and easily 

 distinguished from the rest of the wing. Supra-anal lamina of the 

 male generally short and transverse. Subgenital lamina of the male 

 and the styles generally asymmetrical. Femora usually very sparsely 

 armed. Ootheca chitinous and carried with the suture uppermost. 



ii. Revision of the genus Theganopteryx, Br. 



I was led to a revision of this genus by an examination 

 of its type, T. lucida, Br., which was kindly lent to me 

 with several others by Dr. Dohrn of the Stettin Museum. 

 The type has lost its abdomen and never was provided 

 with a locality label, for the describer hazarded the 

 opinion that the species came from Australia. On seeing 



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