Characters of the Species. 



17 



taken, first, of the whole body ; second, of the extent of wing be- 

 yond the base of shank ; third, of the extent of abdomen beyond 

 the same. In the table below, only the extremes and the average 

 of these measurements are given. It should be observed that as the 

 abdomen shrinks slightly in drying, and the wings do not, the 

 figures in the fourth column are somewhat lower than if taken 

 from dry specimens. This table of measurements will prove 

 interesting when compared with that further on, giving similar 

 measurements of spretus, and will conclusively show, by comparing 

 the figures in the fourth column, that the specific distinction can not, 

 as Mr. Walsh thought, be safely and solely left to length of wing 

 beyond the abdomen; as specimens of either species may in this 

 respect approach very near each other, and in exceptional cases 

 entirely agree, Nevertheless, this relative length of wing has great 

 value as a specific character, inasmuch as the difference in relative 

 length is the rule, while the converse is a rare exception. The anal 

 characters of the male, (Fig. 4) will be found pretty constant and 

 reliable. Yet they also vary and frequently approach spretus in the 

 narrowing notched form of the tip. In the female the anal char- 

 acters are of less value in distinguishing the species. 



CALOPTENTJS FEMTJH-FvUBF.T3I. 



Measurements of the Male ; in Hundredths of an Inch. 





Whole length 

 from front of 

 head to tip of 

 wing. 



Length of wing 

 beyond base 

 of tibia. 



Length of 

 abdomen 

 beyond base of 

 tibia. 



Length of wing 

 beyond tip of 

 abdomen. 



Lowest 



0.94 

 1.12 

 1.03 



0.02 

 0.12 



0.08 



0.00 

 0.08 

 0.03 



000 



0.08 

 0.03 



.Highest 



Average 



Measurements of Female. 



Lowest 



1 



03 



0.02 



0.00 



O.OO 



Highest 



1 



22 



0.15 



0.15 



0.12 



Average... . 



1 



15 



0.08 



0.08 



0.04 



Caloptenus spretus, Uhler Mss. 



Syn., Acridium spretum,* Thomas Trans. III. St. Agr. Soc, 

 T, 450. 



Very much like C. femur-rubrum, Burm., the principal differ- 

 ence being in the length of the elytra and wings ; a notch at the 



* This is called "-Acridium spretis, Uhler " in the article alluded to, and I very 

 much doubt if the description refers to the species in question; first, because I do 

 2 



