EHYTIDICHEOTA.— EHACHICREAGRA. 339 



[5. Rhytidichrota turgida, Stal. 



Rhytidichrota turgida, Stal, Recens. Orthopt. i. p. 54 (1873) '; Syst. Acrid, i. p. 78 (1878) 2 . 

 Hab. Colombia, Antioquia 1 2 .] 



[6. Khytidichrota brunneri, Stal. 



Rhytidichrota brunneri, Stal, Syst. Acrid, i. p. 78 (1878) \ 

 Hab. Colombia 1 .] 



As stated above, all of these insects are liable to occur within " Biologia " territory. 



EHACHICEEAGRA, Eehn. 

 RhacMcreagra, Rehn, Proc. Acad. Nat. Sci. Philad. 1905, p. 444. 



The present genus contains several species of medium-sized, almost apterous, tropical 

 locusts, which are somewhat distantly related to Polysarcus, Saussure. They live 

 about the edges of jungles and in open woods, where they are to be found in moderate 

 numbers. Their sombre colours protect them to a certain extent against birds and 

 other vertebrate enemies. The four species may be separated by the subjoined 

 table : — 



Synopsis of the Species of Ehachicreagra. 



A 1 . Form decidedly robust, the hind femora coarse and considerably 



surpassing the apex of the abdomen in both sexes. Pronotal carina 



strongly undulate or toothed, as is also the hind portion of the meta- 



thorax and the first abdominal segment. 



b l . Legs of male uniformly oil-green, the hind pair of the female 



oehraceous-cinnamon above 1. nothra, Rehn. 



b 2 . Legs of both sexes, except the outer face of the hind femora and the 

 hind tibiae of the male, without the greenish tinge. The carina? of 



the upper edge strongly dotted with fuscous 2. pallipes, sp. n. 



A 2 . Form moderately slender, the hind femora more graceful and extending 



beyond the tip of the abdomen in the males only. Pronotal carina 



gently undulate, but not serrate, the hind edge of the first abdominal 



segment only gently nodulose at the middle. 



b\ Body rather strongly rugose above on the thorax and the first 



abdominal segment. Antennas long and slender. General colour 



of male, including the legs, deep verdigris-green 3. aeruginosa, sp. n. 



b*. Body above comparatively smooth. Antennae shorter and coarsen 

 General colour of both sexes brownish-clay, the legs of the male pale 

 oil-green 4. gracilis, sp. n. 



l. Ehachicreagra nothra, Eehn. 



RhacMcreagra nothra, Rehn, Proc. Acad. Nat. Sci. Philad. 1905, pp. 444-448, figg. 36-39 \ 

 Hab. Costa Eica, Carrillo 1 , Monte Eedondo (Underwood). 



