376 HEMIPTERA-HETEROPTERA. 
In the males of most of the Corixe there is a curious stridulatory organ, termed the 
strigil, on the right or left side of the upper surface of the abdomen towards the apex, 
this varying in structure according to the species*; the abdominal segments, ventral 
and dorsal, are also asymmetric in this sex, sometimes on the right side and sometimes 
on the left f. 
A. Anterior tarsi without claw f. 
1. Corixa interrupta. | 
Corixa interrupta, Say, Journ. Acad. Phil. iv. p. 828 (1825)*; Complete Writings, 11. p. 250° ; 
Uhler, Bull. U.S. Geol. & Geogr. Surv. i. p. 340°; in Kingsley’s Stand. Nat. Hist. i. 
pp. 250, 251, fig. 314 *. 
Corisa interrupta, Vieb. Sp. Gen. Corisa, p. 27, t. 2. figg. 7 (g 9) °. 
Hab. North America®, New York?4, Missouri! 2, Illinois, Maryland, and Cali- 
fornia *».-Merxico >.—Brazit 4 5. 
I have not seen a specimen of this species from within our limits. It is nearly as 
large as the European C. geoffroyi, Leach. Prof. Uhler+ describes “ the pronotum as 
having nine or ten narrow yellow lines; the clavus crossed by zigzag lines at the base, 
and by others which become more slender and straight towards the tip; the corium 
with similar lines, which are more sinuous and interrupted towards the inner margin. 
The pale curved, a little widened in the middle, and acute at the tip; those of the 
male cut off obliquely at the apex, and the sides not curved, but nearly parallel. The 
frontal depression of the male oblong, not very deep, extending up to about as far as 
the middle of the eyes. Length 3°; of an inch.” 
2. Corixa inscripta. 
Corisa inscripta, Uhler, Proc. Calif. Acad. Sci. (2) iv. p. 294°. 
Hab. Norta America, Colorado, New Mexico, Arizona, Texas, and Lower California !. 
— Mexico, Orizaba &c.!. 
Unknown to me. It is described as having ‘“‘a short head, and a long, nearly 
triangular pronotum, the latter with scarcely any indication of a median carina and 
the surface crossed by about fourteen slender brown lines; the elytra with very slender, 
short, dark brown lines arranged in four uneven longitudinal series, the clavus with 
broad, straight, and almost complete yellow bands at the base; the frontal depression 
of the male large and ovate; the pale of the male short, broad-cultrate, acute at thie 
tip, those of the female a little longer. Length 8-9 millim.” 
* Figured by Handlirsch (Ann. naturhist. Hofmus, Wien, 1900, p. 138, t. 7. figg. 6, 7). 
T In the following descriptions the terms “right ” and “left” of the ventral segments are applied as viewed 
from beneath. 
t C. mterrupta, C. inscripta, C. serrulata, and C. melanogaster are unknown to me. 
