PLECTOPTEEIN^E. 



75 



Tribus PLECTOPTERINiE *. 



Chorisoneuridce, Brmmer de W. Syst. Blatt. p. 251. 

 Chorisoneuriens, Saussure, Melang. Orthopt. i. 2 e fasc. p. 94. 

 Chorisoneurites, Saussure, Miss. Scient. Mex., Orthopt. p. 89. 

 Diplopteriens, Saussure, Mem. Mex., Blatt. p. 154 (Prosoplectiens, p. 145). 

 Oocyhaloidw, Brunner de W. Bevis. du Systeme des Orthopteres, p. 40. 



This Tribe is equivalent to the Anaplectinse, but its species are destitute of spines on 

 the femora; it has the same peculiar structure of the wings, i. e. these organs have an 

 apical turned back field — either small and intercalated, or large and appendicular. In 

 the Plectopterinae this character becomes even more strongly pronounced {Diploptera) 

 than in the Anaplectinse. The resemblance of the two tribes is especially remarkable 

 in the genera Chorisoneura (corresponding to Ectobia) and Anaptycta (corresponding to 

 Anaplecta). The genus Plectoptera reproduces also with great similarity the wing of 

 an Anaplecta. 



The name " Chorisoneuridae " has recently been changed to " Oxyhaloidae " by 

 Brunner de Wattenwyl, this author having followed the suggestion of Stal in placing 

 Chorisoneura in his Tribe " Ectobinae," next to Ectobia, owing to its external resem- 

 blance to that genus. The name " Oxyhaloidae," formed from the generic term 

 Oxyhaloa, does not seem suitable, as Oocyhaloa is the only genus in which the most 

 important character of the Tribe (appendicular field to the wings) is not expressed 

 (see below, p. 77). In consequence, we prefer to name this Tribe " Plectopterinae," 

 after the typical genus Plectoptera (comp. pp. 14, 15). 



We do not adopt the views of Stal and Brunner de Wattenwyl as regards the position 

 of Chorisoneura. We consider that the Anaplectinse (Ectobinae, Brunn. de W.) and 

 the Plectopterinae form two parallel series, in each of which much the same kind of 

 types are repeated as follows : — 





Anapxectik^i. 



PlECTOPTEKIN-S!. 



Wings with small intercalated field .... 

 Wings with large appendicular field . . 





f Chorisoneura, Br. 

 1 Prosopleeta, Sss. 



r Plectoptera, Sss. 

 •< Anaptycta, Br. 

 ' Diploptera, Sss. 





The names "Ectobidae" and "Chorisoneuridae," introduced by Brunner de Wattenwyl, 

 are very appropriate, being based on corresponding equivalent genera. Now, as the 

 name " Chorisoneurinae " has to be abandoned, it is convenient to replace it by the 



* Eor the very curious structure and folding of the wings of the species of this Tribe, comp. H. de Saussure, 

 Mem. Mex., Blatt. p. 154; and 'Annales des Sciences Naturelles,' x. p. 161 (1868). 



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