Mr. R. Shelforcl on the Studies of the Blattidac. 655 



known from but a single specimen in a shocking state of 

 preservation. I have made as careful an examination of 

 the dilapidated type as is possible, and find that the apical 

 triangle is not at all conspicuous, and its boundaries are ill- 

 defined ; the femora are sparsely armed and the discoidal 

 sectors of the tegmina so far as can be seen are longitudinal, 

 but this latter point is exceedingly doubtful, owing to the 

 damage sustained by the tegmina. In my opinion none of 

 the other species included by different authors in this 

 genus are congeneric with luncli, and for the present I 

 prefer to regard Pseicdedohia as a monotypic genus. 



iv. Descriptions of some Species of Hemithyrsocera. 



Hemithyrsocera massiiac, Sauss. and Zehntner. (Plate 

 LXXIX, fig. 8, LXXX, fig. 9, compare also fig. 10.) 



Blatta onassuae, Saussure and Zehntner [in] Grandidier's 

 Hist. Madagascar, Orth. i, p. 28 (1895). 



^ . Flavo-testaceous. Head rufo-castaneous, eyes on vertex Avide 

 apart ; antennae testaceous. Pronotum anteriorly and laterally 

 margined with sub-opaque testaceous. Tegmina and wings barely 

 exceeding the apex of the abdomen. Tegmina with 14-1(3 costals, 

 radial-vein bifurcate from the middle, anterior ulnar bifurcate, 6-7 

 longitudinal discoidal sectors. Wings hyaline, veins flavous, media- 

 stinal vein 2- or 3-ramose, 10 incrassated costals, radial vein bifur- 

 cate from middle, medio-discal area about 3 times broader than 

 medio-discal, ulnar vein simple, triangular apical area moderately 

 distinct, 1st axillary 3-ramose. Supra-anal lamina triangular, 

 exceeded by the sub-genital lamina ; opening of scent-gland on 7th 

 abdominal tergite. Sub-genital lamina symmetrical, produced at 

 apex to form a rounded and slightly deflected lobe, right style 

 minute, left style large and shaped like a horseshoe. Cerci moderate, 

 9-jointed. Femora rather sparsely armed. 



Total length 10"5 mm. ; length of body 9 mm.; length of tegmina 

 8'5 mm. ; pronotum 3mm. x 3'2 mm. 



Hah. Abyssinia, Massovva (Geneva Mus., type); Ery- 

 THRAEA, Mt. Geleb (Geneva Mus.). 



Through the kindness of Dr. J. Carl of the Geneva 

 Museum I have been permitted to examine one of de 

 Saussure's specimens ; it is evident that the learned Swiss 

 entomologist overlooked the very remarkable genital styles 

 of this species. 



