121 
l 
28. PEZOTETTIX SCUDDERI. Uhler. 
Resembles somewhat strongly a short-winged Caloptenus femur-ru- 
brum. General color reddish-brown and fuscous. The cranium is less 
prominent than in C. femur-rubrum; the thorax slightly broader, and 
in the female the black stripe on the sides of the head and pronotum 
is much narrower, and sometimes entirely obsolete; the whitish ob¬ 
lique stripe on the metathorax indistinct and sometimes entirely obso¬ 
lete. The elytra do not reach beyond the apex of the second abdomi¬ 
nal segment. The underside of the posterior famora is yellow, and 
the tibiae have a black dot on the knee, and a black ring just below 
it. The tip of the last ventral segment of the male is more narrow¬ 
ed, acute and conically produced than in C. femur-rubrum. In other 
respects than those mentioned it agrees with this species. 
Length of female .8 to .9 inch; male .6 to .7 inch. 
I am not certain that I have met with any specimens of this spe¬ 
cies obtained in Illinois; it is inserted in our list on the statement of 
Mr. Walsh that he had observed it at Rock Island.* 
I have considerable doubt in reference to the species, and do not 
understand why Mr. Uhler, who is usually so full and exact in de¬ 
scribing species, should have given so imperfect a description in this 
case, which I have given above almost in his own words. 
Note.—H ave since seen specimens collected in Illinois. 
29. THE ROCKY MOUNTAIN LOCUST—( Caloptenus spretus— Thos.) 
FlG 19 * JFemale.— The face nearly perpendicu¬ 
lar, sloping under toward the breast 
very slightly. The vertex between the 
eyes the same width as the frontal costa 
just above the ocellus; that portion in 
front of the eyes more or less distinctly 
channeled, and deflexed at an angle of 
about 40 degrees from horizontal. Eyes nearly straight in front, about 
semi-circular behind. Antennae quite slender, reaching little if any 
Caloptenus spretus, Female. 
