EEHN AND HEBARD 149 



Types. — Texas, "May to August," (G. W. Belfrage), two fe- 

 males; Dallas, Texas, "June 13 to 26," (J. Boll), five males, three 

 females. Labelled "Scudder's Type 1876." [All in Scudder 

 Collection.] 



Single Type here chosen.— c? ; Dallas, Texas. (J. Boll.) [Scud- 

 der Collection.] 



Description of Type. — The characters are almost entirely those of difference 

 from the same sex of A. phalangium. Size moderately large. Fastigium 

 low, compressed, acute lanceolate, narrower than in phalangium, longi- 

 tudinally excavate; eyes slightly less prominent than in phalangium, propor- 

 tions of eyes similar. Pronotum slightly less compressed, the dorsum pro- 

 portionately broader, when seen from the side the dorsal outline is hardly 

 elevated cephalad; cephalic margin of disk subtruncate, caudal margin of 

 disk rotundato-rectangulate ; lateral portions of disk with distinct carinate 

 ridges on the prozona, these directed in a sinuate fashion dorso-caudad and 

 moderately converging caudad, stopping abruptly at the transverse sulcus, 

 the latter forming a broad V-shaped pattern on the disk, lateral portions of 

 the disk on the metazona rounding into the lateral lobes cephalad and with 

 very blunt rounded angles caudad, median portion of disk with a very fine 

 medio-longitudinal slightly raised line; lateral lobes with the greatest depth 

 contained one and one-half times in the dorsal length of the same, margins 

 as in phalangium except that the caudal margin is more vertical and less 

 oblique, when viewed from the dorsum the ventral portion of the lobes are 

 seen to diverge more laterad than in phalangium. Tegmina about a half 

 again as long as the body, the width at distal fourth contained slightly more 

 than eight times in the length of the same, the width at the proximal third 

 being hardly greater than at the distal fourth; marginal field and apex of 

 tegmina as in phalangium; discoidal vein with three to four rami; stridulat- 

 ing field subequal to the pronotum in length, its greatest width about two- 

 thirds its greatest length, stridulating vein not at all heavy, straight, 

 strongly oblique, margin of field hardly produced at the apex of the stridu- 

 lating vein, there moderately arcuate, immediately distad of the same 

 sinuato-arcuate, thence obliquely arcuato-truncate. Wings with the ex- 

 posed portion almost equal to half the tegminal length. Supra-anal plate 

 more semi-elliptical than in phalangium; cerci with the distal fourth bent 

 inwards at a right angle, the tips more acute than in phalangium. but other- 

 wise similar; subgenital plate carinate as in phalangium, the distal extremity 

 slightly narrower, distal margin arcuato-emarginate, the styliform processes 

 shorter and blunter. Limbs essentially as in phalangium, the character and 

 proportions similar. 



Allotype here selected. — 9 ; Same data as the selected type. 



Description of Allotype.- — The following characters are those of differ- 

 ence from the male sex of the present species and the corresponding sex of 

 phalangium. Tegmina in proportions and form as in the male; discoidal 

 vein with four rami on each side. Wings with the exposed portion equal to 



TRANS. AM. ENT. SOC, XL. (U) 



