100 ORTHOPTEROUS GROUP INSARAE 



1907. Arethaea Rehn and Hebard, Ibid., 1907, p. 300. 



1908. Arethaea Rehn and Hebard, Ibid., 1908, p. 398. 



1909. Arethaea Rehn and Hebard, Ibid., 1909, p. 168. 

 1912. Arethaea Rehn, Kansas Univ. Sci. Bull., V, p. 306. 



The genus was based on a single species. Genotype.— .4 re^/iaea 

 gracilipes (Thomas) [Ephippitytha gracilipes]. 



Generic Description. — Body elongate. Head having great free- 

 dom of movement permitting vertical or subhorizontal position, 

 occiput tumescent; fastigium declivent, narrowing cephalad, in con- 

 tact with the frontal fastigium, sulcate; internal margin of anten- 

 nal scrobes ampliate; eyes prominent, elongate-elliptical to ovoid; 

 antennae very elongate, brittle, proximad subcrassate. Pronotum 

 more or less decidedly sellate, disk concave, compressed on prozona, 

 more or less deplanate on metazona, caudal margin of disk pro- 

 duced, arcuate to acute-angulate, no lateral carinae or angles pres- 

 ent but strumose lines of pattern on prozona simulating same; 

 transverse sulcus distinct, passing regularly from disk to lateral 

 lobes; lateral lobes longer than deep, narrowing cephalad, caudal 

 margin oblique-truncate or rotundate, with a strumose thickening, 

 caudal portion of lobes moderately to decidedly bullate laterad. 

 Tegmina elongate in male sex, with generally subparallel margins, 

 or in female of similar form but shorter or extremely abbreviate, 

 acute-ovate and shorter than the pronotal disk; apex more or less 

 rounded or acute (in extremely brachypterous females); marginal 

 field roundly developed proximad, evanescent mesad and distad; 

 discoidal vein in distal half emitting two to six rami to sutural 

 margin and apex; anterior ulnar vein straight; stridulating field 

 of male tegmina as long as or distinctly shorter than ]:>ronotal disk, 

 stridulating vein oblique, nearly straight or arcuate, margin of the 

 jBeld not at all or decidedly produced at the apex of the stridulating 

 vein, more or less angularly emarginate distad of the same. Wings 

 in all but extremely brachypterous females surpassing the tips of the 

 tegmina. Meso- and meta-sternum lobate. Abdomen of male sex 

 with or without a dorsal elevated development on the proximo-dorsal 

 segment. Cerci of male simple, attenuate, distal extremity sharply 

 bent or faintly arcuate inwards, apex depressed or conically acute; 

 subgenital plate of male with distal margin truncate or emarginate, 

 true free styles never present, lateral processes substyliform or 

 mere knobs. Ovipositor short, moderately or very deep, margins 

 serrulate distad, disk of ovipositor distad with lamellate teeth ar- 



