PKOSTHACUSTES. 241 



vein very ramose. The humeral vein repulsed into the lateral field ; the discoidal vein 

 forming the ridge, arcuate or sigmoidal at the base, leaving a rather wide lateral area 

 between it and the humeral vein ; this area often narrowly fusiform, reticulated by 

 transverse nervures in the larger species. The oblique veins obliquely transverse, as in 

 the Gryllinge ; the last one not anastomosed at its base to the diagonal vein by an 

 arch, but emerging generally from the stridulating vein, as well as from the preceding 

 oblique veins. The speculum large ; its involving vein continuous, and the involving 

 area thus not divided into cells. 



These insects have very complete stridulating-organs, but produce delicate sounds. 



Group PHALANGOPSITES. 



Phalangopsites , Saussure, Melang. Orthopt. 6 e fasc. pp. 536, 543. 



Elegant and light insects, with long legs, these latter allowing them to progress with 

 ease amongst the grass and weeds. The females apterous in several American genera, 

 with a rounded supra-anal plate, and straight and acute ovipositor. 



In the elytra of the males the vena diagonalis rarely reaches the anal knot, its base 

 being generally fused with the base of the post-anal vein. The speculum is frequently 

 wide, divided by two or more veins. In the species which have apterous females the 

 elytra of the males are more or less abbreviated, destitute of an apical field, but with 

 the apical margin deflexed downwards, and the hind wings are generally completely 

 wanting. When both sexes are winged the elytra are elongate, and terminated by an 

 apical field. (Tab. XII. fig. 4.) 



PKOSTHACUSTES, Sauss. 

 Prosthacusta, Saussure, Miss. Scient. Mex., Orthopt. pp. 430, 436 (1870). 

 Prosthacustes, Saussure, Melang. Orthopt. 6 e fasc. pp. 536, 545. 



In this genus the male elytra are not much shorter than the abdomen, rounded at 

 the tip ; with a triangular speculum ; the oblique veins about four or more in number; 

 the veins of the lateral field simple and longitudinal {i. e., the mediastinal vein not 

 ramose). 



l. Prosthacustes mexicanus, Sauss. (Tab. XII. fig. l.) 



Prosthacusta mexicana, Sauss. Miss. Scient. Mex., Orthopt. p. 437. 1, t. 7. fig. 18 {$). 

 Prosthacustes mexicanus, Sauss. Me"lang. Orthopt. 6 e fasc. p. 545. 



5 . Gracilis, subcylindricus, rufo-testaceus vel brunnescens, rufo-pubescena. Caput et pronotum rufo-castanea. 

 Palpi albidi, articulia 3°-5° elongatis ; ultimo oblique compresso-truncato, infundibuliformi. Pronoti lobi 

 laterales margine infero obliquo, angulo antico minute rotundato. Elytra valde abbreviata, segmenta 3 

 abdominis tegentia, seseque per marginem suturalem tegentia ; campo dorsali fusco-nigro, venis longitu- 

 dinalibus elevatis 5-6; area humerali pallida; area discoidali irregulariter venulosa; campo laterali 

 testaceo, venis longifcudinalibus 4 instructo areaque supera fusca. Alse nullae. Pedes fulvo-rufi ; 

 anteriores et intermedii supra brunneo-annulati vel maculosi ; tibiae anteriores graciles, latere interno 



biol. centr.-amer., Orthopt., March 1897. 2 ii 



