154 ORTHOPTEROUS GROUP INSARAE 



tion, but the average is smaller than in phalangium. In distribu- 

 tion the present form occurs in a region occupied by none of the 

 other forms of the genus except the widety distributed gracUipes, 

 being found entirely northeast of the range of phantasma and east 

 of that of the other forms of the genus found in the United States 

 except phalangium. 



Specimens Examined: 53; 29 cf. 24 9 . 



Dallas, Texas, (J. Boll), 5 c^, 3 9 . Type, allotype, paratypes. [Scudder 

 Collection];! 9, [U.S.N.M.]. 



Shovel Mount, Burnet County, Texas, June 30, 1901, (F. G. Schaupp), 

 1 cf„[A.N.S.P.]. 



Columbus, Colorado County, Texas, 1 9, [U.S.N.M.]. 



Rosenberg, Fort Bend County, Texas, July 25 and 26, 1912, (H.), 2 c?. 



Lavaca County, Texas, June 21, 1 cf, 2 9 , [U.S.N.M.]. 



Victoria, Victoria County, Texas, July 26 and 27, 1912, (H.), 17 c^, 15 

 9; June, (Caudell), 1 d", I 9, [U.S.N.M.]. 



Texas, (Lincecum), Id',! 9, [Scudder Collection]; 1 d", [U.S.N.M.]. 



Arethaea semialata new species (Figs. 34, 45, 55 and 66.) 



1902. Arethaea constricta Scudder and Cockerell (not of Brunner), Proc. 

 Davenp. Acad. Sci., IX, p. 52. (Part.) [Near Organ Mountains, 

 Mesilla Valley, New Mexico.] 



This form needs comparison only with the members of species- 

 group C, i.e. carita, hrevicauda and limifera, toward which it di- 

 verges from the other members of its own species-group B. From 

 all three species of Group C the male sex can immediately be 

 separated by the less decidedly sellate pronotum and the narrower 

 stridulating field of the tegmina, which has the portion at the apex 

 of the stridulating vein far less produced and the general form of 

 the speculum more longitudinal. In the female sex the tegmina, 

 instead of being lanceolate and abbreviate or ovate and sublobate, 

 are at least half as lopg as the body, the integument of the body is 

 smooth instead of strumose at the longitudinal bars and the mar- 

 gins of the dorsal abdominal segments are entire instead of dis- 

 tinctly crenulate. From the other members of Group B (i.e. 

 insaroides, phalangium and grallator) the present form can be dis- 

 tinguished by the greater production of the apex of the stridulating 

 vein of the male tegmina, the narrower ovipositor and moderately 

 brachypterous female. The male bears considerable superficial 

 resemblance to the same sex of gracUipes, but the two can be read- 



