March, 1921.] DaVIS : RECORDS OF NoRTH AMERICAN CiCADAS. 7 



hcquaerti having a like expanse of wings, they invariably are much 

 narrower across the eyes, in other words the variety is a broad 

 headed insect as shown by the figure accompanying the original 

 description. 



In the United States National Museum there is a female speci- 

 men of Tibiccn bcqnaerti from Columbus, Texas. It bears a label 

 stating that it was figured in the " Insect Book, PI. 28, fig. 15." 

 The wings in this specimen ex])and 76 mm., head 12 mm. across eyes, 

 length of body 25 mm., ventral notch broad and shallow. A female 

 Tibiccn rifripcnnis Say from Louisiana with length of body also 25 

 mm. has the width of head 11 mm., ventral notch deeper than in the 

 Texas example and double. A female vitripcnnis from Alexandria, 

 La., June 22, 1910 (E. S. Tucker), expands 75 mm., length of body 

 25 mm., has the width of the head 11 mm.; ventral notch broad and 

 shallow, and feebly double. In the writer's collection there is a 

 female hcquaerti from New Orleans, La., June, 1918 (H. E. Hubert "I , 

 with expanse of fore wings 72 mm., length of body 23 mm., and 

 width of head across eyes 10 mm. The ventral notch is simple. 



It may not prove a very constant character, but in all of the 

 specimens of hcquaerti the transverse black stripe on the head be- 

 tween the eyes, does not reach the eyes, whereas in vitripcnnis the 

 stripe continues right across the front of the head in 28 out of the 

 30 specimens at hand, and in the two exceptions the stripe almost 

 reaches the eyes. 



Tibicen knighti Davis. 



This species was described and figured in the Journal of the 

 N. Y. Ento. Soc. for December, 1917, shortly after which Dr. H. 

 H. Knight contributed the following additional information: "The 

 new knighti was taken in Sabino Canyon of the Santa Catalina 

 Mountains, at an altitude of about 6,500 to 7,000 feet. I spent about 

 five minutes trying to locate the first one ; I could not see it, and 

 looked first for a Cicada and then for an Orthopterous insect. I 

 had to give it up and scare it out of the bush before locating it. The 

 species preferred to alight on the shrubbery that covered the rocky 

 slopes of the canyon, among the many giant cacti. I remember I saw 

 one female and missed it bv not being careful." 



