REHN AND HEBARD 131 



The characters separating the present race from A. gracilipes 

 s.s. have been emphasized under the typical form. 

 Type. — cf ; Dallas, Texas. [Berlin Museum.] 



Description of Male. — ^The following characters, which are purely com- 

 parative with the same sex of true gracilipes, are drawn up from a male bear- 

 ing the following data; Victoria, Victoria County, Texas, July 26 to 27, 1912, 

 (Hebard), [Hebard Collection]. 



Size medium. Head with the depth greater in proportion to the width im- 

 mediately ventrad of the eyes; occiput more compressed, lanceolate, mar- 

 gins nearly straight cephalad but moderately divergent caudad ; eyes slightly 

 narrower in proportion to the length than in true gracilipes. Pronotum 

 less inflated, not buUate across the lateral lobes, dorsal outline more con- 

 cave when seen from the side, than in the other race; disk distinctly longer 

 and proportionately narrower, the greatest width of the disk caudad hardly 

 more than half the length of the same; cephalic margin of the disk bisinuate 

 with a median blunt angle, caudal margin of disk acute-angulate; obomegoid 

 figure of transverse sulcus narrower; lateral lobes with the caudal margin 

 obliquely sinuato-truncate. Tegmina with the lobate marginal field no 

 longer than the pronotum; stridulating field much shorter than the pronotal 

 disk, structure of the field as in true gracilipes except that the stridulating 

 vein is more obliquely arcuate. Process of the proximo-dorsal abdominal 

 segment not strongly erect nor recurved, trigonal when seen from the side, 

 the dorsal outline oblique, the caudal vertical, the whole appendage low, in 

 form more decidedly a fold of the plate than an elevated specialized append- 

 age as in gracilipes s.s. Disto-dorsal abdominal segment with the distal 

 margin sinuato-truncate; supra-anal plate semi-elliptical in form; cerci as in 

 true gracilipes but with the distal fourth not bent rectangularly, but oblique- 

 ly directed inwards and the same portion slenderer; subgenital plate with the 

 distal margin moderately broad, subtruncate, lateral styliform processes 

 moderately long. Cephalic and median femora proportionately as in gra- 

 cilipes s.s. Caudal femora a third again as long as the tegmina, very slender. 



Description of Female. — As typical of the female sex we have selected a 

 topotype; Dallas, Texas, September 25 to 26, 1912, (Rehn and Hebard), [He- 

 bard Collection]. The features of the female have been almost entirely 

 covered in the preceding description of gracilipes (female) and the male of 

 the present form, so that it is only necessary to call attention to several 

 points. Fastigium lower and less developed than in the male. Caudal mar- 

 gin of the disk of the pronotum equally as acute-angulate as in the male. 

 Appendages as in the female of gracilipes s.s., but ovipositor not quite so 

 deep and the apex of the dorsal valves slightly sharper. 



TR.4NS. AM. ENT. SOC, XL. 



