86 HEMIPTERA-HETEROPTERA. 
DYSODIUS. . 
Dysodius, Lepeletier de Saint-Fargeau et Serville, Encycl. Méth. x. p. 654 (1825); Amyot et 
Serville, Hist. Nat. Ins. Hémipt. p. 304; Stal, Hemipt. Afric. ii. p. 31; Enum. Hemipt. iii. 
pp. 140, 143. 
This genus includes some of the largest forms of the family Aradide, and is 
characteristic of the forest-regions of Tropical America. Four of the described species 
are American, all of them occurring within our limits. 
a, Abdominal segments 2-6 each separately dilated laterally into a rather 
broad rounded plate, the margin of which is crenulate, the third segment 
with a ring-shaped elevation within . . . . . . « lunatus, F. 
6. Abdominal segments conjointly rounded and crenulate at the sides, the 
third segment without a ring-shaped elevation within. 
a! Legs elongate; post-ocular tooth short ; pronotum more or less dilated 
at the sides posteriorly . . . . 6. 2. © 2 © «© «. 6 «© © crenulatus, Stal. 
b'. Legs comparatively short; post-ocular tooth extending outwards to 
beyond the eyes; pronotum subparallel at the sides posteriorly. 
a", Apical process of the head spinose at the sides ; joint 2 of the antenne 
more than half the length of 1; outer margins of the apical lobes 
of the pronotum rounded ; hind femora reaching to a little beyond 
the abdominal margins . . . ~ 6 2 ew ew ee ew fe) COrevipes, Bergr. 
b", Apical process of the head crenate at the sides ; joint 2 of the antenne 
not half the length of 1; outer margins of the apical lobes 
of the pronotum oblique; hind femora not reaching beyond 
the abdominal margins . . . . - + « «© « + « « « ~ ampliventris, Bergr. 
1. Dysodius lunatus. (Tab. VI. fig. 9, 3.) 
La Punaise araignée, Stoll, Punaises, p. 53, t. 18. fig. 84 (1788)'. 
Acanthia lunata, Fabr. Ent. Syst. iv. p. 72 (1794) *. 
Aradus lunatus, Fabr. Syst. Rhyng. p. 117°; Wolff, Icones Cimic. p. 168, t. 17. fig. 162 °*. 
Dysodius (Aradus) lunatus, Guér. Icon, Régne Anim., Ins. iii. p. 349, t. 56. figg. 15, 15a’. 
Dysodius lunatus, Herr.-Schatf. Wanz. Ins. viii. p. 119, t. 287. fig. 884°; Stal, Hemipt. Fabr. 
i. p. 957; Enum. Hemipt. ii. p. 148°; Uhler, in Kingsley’s Stand. Nat. Hist. ii. p. 284, 
fig: 826°. 
Depodius lunatus, Stal, Stett. ent. Zeit. 1862, p. 437". 
Hab. Mextco®® 1°, Jalapa (Hoge), Omealca (MM. Trujillo), Oaxaca (Mus. Brit.) ; 
British Honporas, Belize, R. Sarstoon, R. Hondo (Blancaneaux); GuatEMALa, 
Cubilguitz, Cahabon, Panzos, Chacoj, San Juan, and Tamahu in Vera Paz, El Reposo 
(Champion); Nicaraaua, Chontales (Janson); Costa Rica, Caché (Rogers); Panama 
(Boucard), Bugaba, Volcan de Chiriqui (Champion).—Souta America ® 4, Colombia ®, 
Venezuela, Surinam ! 8, Amazons, Brazil’. 
A very variable species, the figures of Stoll and Guérin representing | extreme forms 
