230 NEW NORTH AMERICAN DECTICINAE 



No relationship exists with any of the other species which have 

 been referred to the present f>;enus. 



Type. — cf; Lee Canyon, Spring Mountains, Clark County, 

 Nevada. Elevation, 6000 feet. August 18 to 21, 1919. (Rehn 

 and Hebard; in tree yucca {Clistoyucca brevifolia). [lieljard C'ol- 

 lection, Type no. 541.] 



Size and form imicli as in A. ^rgnis: surface similar hut ])ron<)tuin smootlior 

 and less ru^ulose. 



Head as in ,1. sq/nis hut less inflated ventrad on the genae, the greatest 

 widtli of the head across genae very slightly greater than that across eyes, 

 tiie outline of genae from cephalic aspect moderately arcuate, instead of 

 api)re(aably diverging ventrad, as in A. segnis: interspace between the fastigia 

 of the vertex and of the face broader and shallower than in A. segnis, when 

 seen in profile: fastigium of the face very low and very blunt. 



Pronotum with greatest dorsal length about three-fourths of the length of 

 the caudal femora. In profile tlie dorsal outline of the pronotum is nearly 

 straight cephalad, moderately areuate-decurved caudad; when seen from 

 caudal aspect distinctly arcuate transversely on disk. Disk of pronotum 

 with the mesozona and metazona elliptic-ovate in outline, the broadest 

 point of disk very faintly caudad of middle of same, the greatest width con- 

 tained one and two-thirds times in the greatest length of pronotum, the width 

 of disk on j^rozona about three-fifths of the greatest width of same on meso- 

 zona: (cephalic margin of disk of pronotiun subtruncate; caudal and distal 

 portions of lateral margins of disk semi-ovate, the lateral margins obsolete 

 on the ])rozona, distinctly and arcuately developed on mesozona, but less 

 sharply so than in A. segnis, on metazona less strongly arcuate laterad than 

 in segids, there non-strumose and hardly thickened: median carina obsolete 

 on the prozona, subobsolete on the mesozona and very weakly indicated and 

 not appreciably elevated on the metazona: surface of the disk with micro- 

 scopic transverse vermiculate etchings, but never the rugulae of A. segnis, 

 the internal channel bordering the caudal margin of the disk distinct but 

 shallow, hardly indicated along the lateral margins: transverse sulci as in 

 A. segnis but less decided and smoother. Lateral lobes of pronotum of the 

 type found in this germs: greatest depth of lobes at cephalic fifth, contained 

 two and two-thirtls times in the dorsal length of the same: cephalic margin 

 of lobes truncate, ventro-cephalic angle obtuse, ventral margin descicnding 

 in cephalic; fifth, there rounded obtuse-angulate, the margin thence obli(iuely 

 ascending, straight, to the distal foiu'th, where it is weakly concave: surface 

 of lobes but weakly rugulosc;, the transverse sulci but weakly impressed, the 

 caudal sulcus not afjpreciably interrupting or even severing the lateral carinae 

 of the disk. Tcigmina as in segnis. Sternal parts as describcul in A. segnis. 



Abdomen as de.scribed for .1. .segnis, with the following differences: supra- 

 anal plat(> or el(!venth tergite, which is apparently fused with the tenth ter- 

 gite, broader than in segnis, tiie lateral and caudal margins nearly semi- 



