8(3 HKITISH OttTHOPTERA. 



Our single species, B. germanica, used to appear 

 in the genus Phyllodromia Serv., which was thus 

 diagnosed : 



Abdomen conique, plus allonge que dans la premiere 

 division [i. e. " Blatte vraie, Blatta propru 1 . dicta ' 

 dans les males surtout ; diminuant sensiblement de 

 largeur, des sa base. Plaque sousanale des males, en 

 cone allonge et point u. Septieme ou dernier segment 

 abdominal, de meme largeur a peu pres que le 

 sixieme, et point echancre : taille ordinairement petite. 

 (Phyllodroinie, Pkyllodromia.) (<t>u'AAov, feuille ; SOE^W, 

 je cours.) (Serville, ' Ins, Orth.' p. 105 (1859).) 



Phyllodromia was, however, preoccupied in the 

 Diptera ; so in 1903 A. K". Caudell proposed Blattella 

 for Phyllodromia, the type being Blatta germanica of 

 Linnasus. Most orthopterists followed him but R. 

 Shelford did riot, because it was obvious that Phyllo- 

 dromia was in need of revision and subdivision. 

 Shelford came to the conclusion that Phyllodromia 

 Serv. should be split into at least six genera, one of 

 which is Blattella Gaud., and the others Neoblattella 

 Shel., Margattea She!., Supella SheL, Eobotta Shel., 

 and Chorisoblatta Shel. 



Diagnosis of Blattella Gaud, in Shelfordian sense : 



Antennae setaceous. Tegmina and wings exceeding 

 the apex of the abdomen. Tegmina with longitudinal 

 discoidal sectors. Wings with the anterior part 

 rather narrow, scarcely tapering to the base, ulnar 

 vein simple or bifurcate, very rarely tri-ramose, no 

 apical triangle. Front femora armed on the anterior 

 margin beneath with a complete row of spines, the 

 more distal shorter than the more proximal. Sexes 

 similar. Ootheca coriaceous, carried by the female 

 with the suture directed to one side. Type of genus 

 -Blatta (jennanica Linn. (" Preliminary diagnoses of 

 some new genera of Blattidae," ' But. Mo. Mag.' 1911, 

 p. 154.) 



