JAMES A. G. REHN 



237 



Measurements {in millimeters) 



Greatest 

 caudal 



width of Length of 



•71 Length of Length of pronotal Length of caudal 



O body pronotum disk tegmen femur 



Mason, Nevada, allo- 

 type 15 3.3 2.7 14.5 8.9 



Mason, Nevada, 



paratype 13.2 2.9 2.7 14.5 8.4 



Mina, Nevada, aver- 

 age of seven para- 

 types 14.3 3.1 2.5 14.9 8.5 



(13.7-15.5) (3-3.4) (2.4-2.8) (14.2-16) (8.2-9> 

 9 



Mason, Nevada, /(/pe 20.4 4.1 3.5 19 10.4 



Mason, Nevada, aver- 

 erage of six para- 

 types 20 4.1 3.4 18.8 10.4 



(18.5-21.2) (4-4.3) (3.2-3.7) (18.2-19.8) (10-11.2) 



Mina, Nevada, para- 

 type 20.5 4.2 3.4 19 9.9 



Mina, Nevada, ])ara- 



type 20.8 4 3.4 19 10.5 



In addition to the type and allotype we have before us one 

 male and six females bearing the same data as the type, and seven 

 males and two females taken at Mina, Mineral County, Nevada ; 

 elevation, 4350 feet; September 3 and 4, 1910; (Rehn and 

 Hebard.). All the specimens here recorded, in addition to the 

 type and allotype, are considered paratypes. 



In structure the series shows certain features of variation. 

 The pronotum, as usual in any series of the species of the genus, 

 shows some variation in breadth to length, in one extreme being 

 slightly longer than greatest breadth across the metazona of disk. 

 The frontal costa shows a slight degree of variation in the strength 

 of the constrictions and in the continuity of the sulcation, while 

 the lateral carinae vary in their indication, being occasionally 

 obsolete in the male and never stronger than in the type. The 

 median carina of the pronotum is weakly variable in the arcuation 

 of the cephalic portion of the prozonal section, and in the degree 

 of indication on the caudal portion of the same section. The 

 tegmina vary from three to over three times in length of head 

 and pronotum combined, while the wings are occasionally broader 

 than in type, being one and six-tenths times width in length. 

 The mesosternal interspace has the cephalic margin varying from 



TRANS. AM. ENT. SOC, XLV. 



