MONTINA.—ARILUS. 287 
1. Montina nigripes. (Tab. XVII. fig. 22, ¢.) 
Montina nigripes, Stal, Ofv. Vet.-Ak. Forh. 1859, p. 197 (9)'; Enum. Hemipt. ii. p. 73’. 
Hab. Panama, Volcan de Chiriqui (Champion), Colon (Boucard).—Braziu, Bahia } 2. 
In this species the outer margins of each of the connexival segments 1-5 are 
subangular towards the apex. The pronotum, connexivum, and the outer margins of 
the corium are sanguineous or rufous in fresh specimens. ‘The last genital segment 
of the male is armed at the apex with an upwardly curved tooth; the third antennal 
joint is slender in both sexes. Twelve specimens have been seen from within our 
limits. 
2. Montina scutellaris. (Tab. XVII. fig. 23, 2.) 
Montina scutellaris, Stal, Ofv. Vet.-Ak. Forh. 1859, p. 197 (¢)?; Enum. Hemipt. ii. p. 74°. 
Hab. Costa Rica (Mus. Berol.+), 
Differs from M. nigripes in having the outer margins of the connexival segments 
2-5 less dilated, and not distinctly angulated before the apex. Our figure is taken 
from the type *. 
ARILUS. 
Arilus, Hahn, Wanz. Ins. i. p. 33 (1831). . 
Prionotus, Laporte, Essai Class. syst. Hémipt. in Guérin’s Mag. Zool. 1832, p. 8; Stal, Ofv. 
Vet.-Ak. Forh. xvi. p. 196 (1859) ; Enum. Hemipt. i. pp. 67, 72 f. 
Prionidus, Uhler, Check-list Hemipt. Heteropt. N. Am. p. 23. 
An American genus including several very closely allied species of large size, 
remarkable on account of the greatly developed and peculiarly formed posterior lobe 
of the pronotum, this latter being more or less cristate down the middle and set with a 
row of smooth shining black tubercles, and at the base there are two stout spines. 
They prey upon small insects which live upon trees and bushes, and are able to 
inflict a very painful wound. The three species occurring within our limits may be 
separated thus :— . 
Posterior lobe of the pronotum convex and strongly cristate. 
Margins of the abdomen distinctly sinuate; the sides of the pronotum not 
or scarcely dilated behind the postero-lateral angles . . . « « « cristatus, L. 
Margins of the abdomen not or very feebly sinuate; the sides of the 
pronotum distinctly dilated behind the postero-lateral angles . . . gallus, Stal. 
Posterior lobe of the pronotum flattened and feebly cristate . . . . . . depressicollis, Stal. 
* From a drawing made by Fr. H. v. Zglinicka. 
ft The name Prionotus was twice preoccupied in Zoology when used by Laporte. 
