288 HEMIPTERA-HETEROPTERA. 
1. Arilus cristatus, 
Cimex cristatus, Linn. Cent. Ins. rar. p. 16 (1763)1; Ameen. Acad. vi. p. 8997; Syst. Nat. ed. 12, 
1. 2, p. 723°; Gmelin, Syst. Nat. i. 4, p. 2195 * (nec Goeze, nec Amyot et Serv.). 
Prionotus cristaius, Stal, Enum. Hemipt. ii. p. 72°; Uhler, Bull. U.S. Geol. & Geogr. Surv. i. 
p. 827 °. 
Prionidus cristatus, Uhler, Proc. Calif. Acad. Sci. (2) iv. p. 2837. 
Reduvius novenarius, Say, Am. Ent. ii. t. 31. fig. 2 (1825)°; Descr. new sp. Heteropt. Hemipt. 
(New Harmony, Dec. 1831)°; Complete Writings, i. p. 71, t. 31. fig. 2°. 
Nabis novenarius, Say, Complete Writings, i. p. 358”. 
Arilus denticulatus, Westw. in Drury’s Illustr. Exot. Ins. new edit. ii. p. 73 (1837) ”. 
Prionotus patulus, Walk. Cat. Hemipt. Heteropt. viii. p. 76 (¢)™. 
Hab. Norta America®", Atlantic region of New York®, Pennsylvania !2, Maryland ®, 
Carolina 1~*, Texas °°, Lower California 7—Mexico °° (Sallé), Orizaba (Bilimek, in 
Mus. Vind. Ces.; H. H. Smith ; Godman); Guatemaua (Deby), El Jicaro in Vera 
Paz (Champion). | oe 
A common insect in the Southern and Eastern United States, extending southwards 
along the Atlantic slope to Guatemala. According to Prof. Uhler °, it lives upon small 
pine-trees and preys upon caterpillars and other insects. Of the twelve specimens 
before me from Mexico and Guatemala, one only is of the male sex. J. cristatus 
differs from the 8.-American and Antillean A. carinatus, Forst. (=serratus, Fabr., and 
santhopus, Walk.), in having fewer tubercles on the crest of the pronotum (12-14 in 
A. carinatus, 8-10 in A. cristatus), and the margins not distinctly dilated behind the 
postero-lateral angles. The margins of the abdomen are sinuate in both sexes. Walker!2 
states that the legs are wholly black in P. patulus, but in his type the posterior tibize 
are obscure ferruginous. 
2. Arilus gallus. (Tab. XVII. figg. 24, 24a, 3.) 
Prionotus gallus, Stal, Enum. Hemipt. ii. p. 72 (1872)*. 
Prionotus mundus, Walk. Cat. Hemipt. Heteropt. viii. p. 77 (1873) ?. 
Hab. Panama, Volcan de Chiriqui 2000 to 8000 feet (Champion).—Cotomsta, Bogota}; 
VENEZUELA ”. 
Plentiful in forest-clearings on the slope of the Volcan de Chiriqui. This species is 
very like A. cristatus, but differs from it in having the sides of the pronotum distinctly 
dilated behind the projecting postero-lateral angles and the spines at the base shorter ; 
the margins of the abdomen, too, are rounded and almost entire (instead of being 
distinctly sinuate, as in A. cristatus). The front of the head, the rostrum, antenne, 
and tibiee, and the apices of the anterior femora, are more or less ferruginous, and the 
intermediate and hind femora are sometimes obscurely ferruginous towards the base. 
The pronotal crest is furnished with 9-11 tubercles. About sixty specimens have been 
examined. 
