78 OKTHOPTEBA. 



CHOEISONEUEA, Brunn.de W. 

 Chorisoneura, Brunner de W. Syst. Blatt. p. 255 ; Saussure, Miss. Scient. Mex., Orthopt. p. 90. 



In this genus the elytra have always two longitudinal nervures — the discoidal and 

 the median veins. The nervures of the discoidal field are either all longitudinal or 

 oblique ; in the latter case they form oblique branches of the median vein, but they are 

 neither numerous nor dense. 



Synopsis specierum. 

 I. 



a. Venae campi discoidalis omnes longitudinales. — [1. anomala, sp. n.] 

 aa. Venae campi discoidalis obliquae, in vena ulnari remote subpectinata. 



b. Campus intercalates alarum basi rectangulus, apice prominulus, rotundatus vel sub- 

 truncatus. 

 c. Vena ulnaris alarum apice ramosa. — [2. texensis, sp. n.] ; [3. surinama, Sss.]. 

 cc. Vena ulnaris alarum apice indivisa. (Campus intercalatus basi subacutus.) 



d. Alae infuscatae, campo intercalato valde prominulo, apice arcuato, basi obtusangulo. 

 — [4. dimidiaticomis, sp. n.] 

 dd. Alae flavicantes. 



e. Campus intercalatus minus prominulus, apice subtruncatus, parum arcuatus, 



basi subacutangulus. Elytra vix fulvescentia. — 5. mysteca, Sss. 

 ee. Campus intercalatus prominulus, apice valde arcuatus, basi rectangulus. 

 Elytra fulva. — 6. flavipennis, sp. n. 

 bb. Campus intercalatus basi acutangulus. 



c. Vena ulnaris alarum apice ramosa ; campus intercalatus apice vix prominulus. 



d. Campus intercalatus apice leviter incisus ; alae flavicantes, venis et costa flavis. — 

 7. pellucida, Sss. ; [8. minuta, sp. n.]. 

 dd. Campus apicalis haud incisus. 



e. Alae flavicantes, apice infuscatae. — [9. inquinata, Sss.] 

 \ee. Alae hyalinae, venis brunneo-testaceis, campo marginali vitta brunnea. — 10. 

 teeniata, sp. n. 

 cc. Vena ulnaris alarum apice indivisa vel haud distincte ramosa. 



d. Alse infuscatae, campo intercalato apice prominulo, subsinuato, basi subrectangulo ; 

 elytra inter venas frequenter infuscata. — 11. translucida, Sss. 

 dd. Alas flavicantes ; campus intercalatus breviter prominulus : 



e. apice arcuatus, basi valde acutangulus. — [12. gracilis, Sss.] 

 ee. apice subtruncatus, basi subrectangulus. — 5. mysteca, Sss. 



II. 



1. Pronotum: 



a. Antice arcuatum. — \_2. texensis"] ; 6. flavipennis ; 10. tceniata ; 11. translucida. 

 aa. Magis ellipticum, antice transversum, subtruncatum. — 5. mysteca; 6. flavipennis ; 

 7. pellucida) [9. inquinata]; 11. translucida; [12. gracilis] . 



