March. 19J1.] D.WIS : RECORDS OF XoRTH A.MKRICAN CiCADAS. 7 



bcquacrti 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 bcquacrti 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 cxi)and 76 mm., head 12 mm. across eyes. 

 length of body 2=, mm., ventral notch broad and shallow. A female 

 Tibiccn vitrif^cniiis Say from Louisiana with length of body also z-. 

 mm. has the width of head 1 1 mm., ventral notch deeper than in the 

 Texas example and double. A female z'itripcniiis from .Mexandria. 

 La.. June 22. 191 o (E. S. Tucker), expands 75 mm., length of body 

 25 mm., has the width of the head 1 1 mm. ; ventral notch broad and 

 shallow, and feebly double. In the writer's collection there is .1 

 female bcquacrti from New Orleans. La.. June. 191 8 (H. E. Hubert), 

 with expanse of fore wings y2 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 bcquacrti the transverse black stripe on the head be- 

 tween the eyes, does not reach the eyes, whereas in ritrif^cnnis the 

 stripe continues right across the front of the head in 2S 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 Jol-rnal ok tiif. 

 N. Y. Ento. Soc. for Deceml>er, 191 7. shortly after which Hr. 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 sec 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 bu.sh 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 liy not being careful." 



