178 ORTHOPTEROUS GROUP INSARAE 



Arethaea phantasma new species (Figs. 35, 49, 59 and 71.) 



This very strongly marked species differs from all of the other 

 forms of the genus in the structure of the pronotum, of the margins 

 of the abdominal segments and the form of the anal vein of the 

 tegmina. In the texture of the tegmina it is different from the 

 majority of the species, the non-produced dorsal margins of the 

 genicular extremity of the cephalic and median femora separate 

 it immediately from phalanghmi and grallator, the long-winged 

 female from semialata, aracJmopyga and probably all the species of 

 group C, while the non-produced extremity of the stridulating vein 

 distinguishes it from gracilipes. 



Type.— d' ; Benavides, Duval County, Texas. August 9 and 10, 

 1912. (Rehn & Hebard.) [Hebard Collection.] 



Description of Type.— Size medium; form very slender. Head with the 

 greatest width across genae contained one and one-half times in the greatest 

 depth of the head; occiput moderately declivent to the fastigium and 

 strongly so to the antenna! scrobes; fastigium very broad, strongly rounded 

 when seen from the lateral aspect, narrowing cephalad, lateral margins 

 sharp, with a moderate medio-longitudinal sulcus, apex low and subobsolete, 

 interfastigial suture distinct; facial fastigium low, median ocellus ovate, 

 deeply impressed, large ; eyes short elliptical, less than twice as deep as the 

 greatest width of the same, the depth slightly greater than that of the infra- 

 ocular portion of the genae, very prominent; antennae about two and a half 

 times as long as the tegmina. Pronotum strongly sellate, when seen from 

 the side the dorsal outline is rather sharply elevated cephalad and more 

 gradually elevated caudad, the disk and dorsal portion of the lateral lobes 

 considerably impressed mesad; cephalic margin of disk arcuato-emarginate, 

 caudal margin of same strongly arcuate, slightly flattened, all of the margins 

 of the pronotal disk and lateral lobes with more or less regularly placed 

 calloused points or beads; disk with a median impressed V-shaped figure, 

 the lateral portions of which design are continued obliquely ventro-cephalad 

 over a considerable portion of the lateral lobes; disk completely rounded 

 into the lateral lobes and only the faintest possible indication of angles 

 present cephalad and caudad; lateral lobes with the greatest depth (caudal) 

 contained about one and one-half times in the greatest dorsal length of the 

 same, cephalic margin of lobes sinuato-emarginate, ventro-caudal angle 

 bluntly rectangulate, ventral margin arcuato-emarginate on cephalic three- 

 fifths, caudal two-fifths of ventral margin and caudal margin broadly ar- 

 cuate, humeral sinus broad, deep, rotundato-rectangulate, surface of 

 ventro-caudal portion of the lobes rugulose. Tegmina (as well as the 

 greater portion of the exposed area of the wings) coriaceous in texture, ven- 

 ation decidedly elevated, the length exceeding that of the body by about a 

 fourth, narrow, at proximal third distinctly but not greatly narrower than at 

 distal fourth; marginal field considerably expanded but limited to proximal 



