205 
listed by Mr. Hart as “Cydnus sp.” in his discussion of the sand insects 
of the Havana region.* I obtained one nymph at Urbana, September 10, 
1917.] 
3. Cyrtomenus A.& S. 
CyRTOMENUS MIRABILIS Perty 
Cydnus mirabilis Perty, Del. Anim. Artic., p. 166. 1834. 
S. C., Ga., Tex., N..M., S. Am..(V. D.). One example taken at street 
light, Cairo, Ill., August 1. Adults and numerous nymphs were sent me 
by Prof. E. L. Worsham from Georgia as injurious to the chufa, or edible 
sedge-root (Cyperus esculentus L.). 
4, Arruus Dall. 
AETHUS oBLiguus Uhl. 
Microporus obliquus Uhler, Prel. Rep. [1871] U. S. Geol. Surv. Montana, 
etc., p. 394. 1872. 
Colorado, Utah, New Mexico, Texas (V.D.), Nebraska (Zimmer), 
Iowa (Stoner), New Jersey, Long Island (Davis), Rocky Mountains to 
Atlantic Coast (Vestal).; Two specimens in our collection from sandy 
areas near Havana, one from Texas, two from northern Illinois, and 8 
from Oregon, IIl., June 21, 1917, taken under a board in a sand “blowout” 
by J. R. Malloch and the writer. All of Stoner’s specimens found in the 
sand about the roots of a bunch-grass, Sporobolus cryptandrus. 
5. AMNEsTUs Dall. 
The genital structures are extraordinarily unlike the usual heteropter- 
ous type. The sex which bears the large spine on fore or hind femora 
has been called the female; but, judging from analogy and from careful 
study of the genitalia, I consider it the male. [Unquestionably it is.] In 
this sex the anterior part of the pronotum is distinctly tumid and shining 
and very obsoletely punctulate, while the same area in the female is 
scarcely elevated above the posterior part, and its surface is distinctly 
punctulate. At least the two smaller species are occasionally taken at 
lights in considerable numbers. [The peculiar platelike extension of the 
metasternum, included as a character in the key, I have seen in no allied 
genus nor in Pentatomidae. | 
Key To SPECIES 
Fore femora of male beneath with large sub-basal bifid spine; hind femora with 
small subapical spine; in female both unarmed; jugal spines 5 (sometimes 
6 in spinifrons). “fe 
Pronotum piceous black, elytra concolorous or paler; spine of male hind 
femora well developed; length about 3 mm., breadth, 2 mm...... spinifrons. 
Pronotum and elytra light ferruginous brown; spine of male hind femora 
very small; length about 2 mm.,, breadth 1144 mm..........0++...-. pallidus. 
* Bul, Ill. State Lab. Nat. Hist., Vol. %, De 209. 
+ Bul. Ill. State Lab. Nat. Hist., Vol. 10, p. 30. 
