66 BULLETIN 63, UNITED STATES NATIONAL MUSEUM. 



Hahltat. — Arizona (Fort Apache, Casey ; Galiuro Mountains, May ; 

 Fort Grant. July; Chiricahua Mountains, May, Hubbard and 

 Schwarz; Williams, July; Ash Fork, June; Flagstaff, July, Barber 

 and Schwarz; Kearn's District, Navajo Indian Reservation, April 

 A. W. Barber; Peach Springs, AYalnut, Winslow, July; Seligman, 

 July, H. F. Wickham; Prescott, H. C. Fall) ; New Mexico (Pecos, 

 July). 



Number of specimens studied, 85. 



Tj^pe is in Col. Thomas Casey's collection. 



T ype-localiti) . — Fort Apache, Ariz. 



Salient type-characters. — Prothorax with the disc evenly convex, 

 finely, sparsely punctate, the punctures becoming rather coarse later- 

 all}^ but not very dense ; apex feebly emarginate ; sides more strongly 

 arcuate before the middle, thence moderately convergent and gradu- 

 ally feebly sinuate to the basal angles, Avhich are very obtuse but not 

 distinctly rounded; base feebly and evenly arcuate. Elytra with 

 the disc very deeply sulcate, the sulci finely, rather sparsely and 

 muricately j^unctate, the intervals equal in Avidth to the sulci, very 

 convex, finely and sparsely punctate (Casey). 



Diagnostic characters. — The strongly sulcate elytra separates this 

 race from all others of the group. The individuals are unusually 

 larger and more elongate than ohsoleta. 



Well developed specimens appear quite distinct from ohsoleta. but 

 they mark a heterotypical variation which is connected to the typical 

 form of ohsoleta by an abundance of mesot^'pes of all sizes and 

 sculpturing, so that it can only be considered as a good variety. 

 Some individuals are nearly as large as ampla^ notably a series from 

 Fort (irant, Arizona, collected by Hubbard and Schwarz. I have 

 authentic examples l)efore me kindly contributed to jMr. Charles 

 Fuchs and myself by Colonel Casey. 



The mentum is moderate and varies in form from trapezoidal to 

 trapezoido-parabolic ; surface is rather strongly punctate, seta? small, 

 moderately convex and more or less strongly foveate laterally and 

 luirrowly impressed along the apical margin, the latter being fre- 

 quently defiexed. 



In Casey's types the ]:)rosternal process is prolonged and prominent. 

 In the series before me it is very variable — from a small mucro to 

 well develoi^ed, or compressed and subti-uncate behind. 



The mesosteriHim varies relatively with the foregoing, concave to 

 convex, slightly oblique to vertically declivous. 



The intercoxal process of the first abdominal segment is subquad- 

 rate (male) or slightly transverse (female), and about a third of its 

 Avidth wider than the metasternal salient. 



The metasternum laterally between the coxa? is as long as the width 

 of a mesotibia at apex. 



