300 HEMIPTERA. 



longest, nearly as long as the two following joints together; 

 fourth longer than the fifth. Rostrum rather long, reaching the 

 base of the ventral spine ; second and third joints ahout equal, 

 fourth shorter, basal joint half concealed within the head. Body 

 elongate ovate. Thorax unarmed, gibbous. Scutellum rather 

 small. Membrane of the elytra with longitudinal nervures. 

 Sternum with a strong keel, which is more elevated anteriorly, 

 and cut off obliquely at its posterior extremity to make room for 

 the ventral spine. Ventral spine short, scarcely passing the pos- 

 terior coxae. Tarsi of two joints. 



Acanthosoma, p., H. Schaff. Wanz. viii. (1845). 



1. MICRODEUTERUS megaccphalus. PI, X. fig. 4. 



Acanthosoma megacephalum, H. Sch.Wanz.viii. 5. t. 251. fig. 783 

 (1845). 



a. N. India. From Capt. Boys's Collection. 



Genus 38. DIPLOSTIRA, n. g. 



Head large, rounded in front, with the central lobe as long as 

 the lateral. Ocelli moderate, placed very little farther from each 

 other than from the eyes. Antennae inserted a little in front of 

 the eyes, about half the length of the body, five-jointed ; basal 

 joint very short, not reaching nearly to the apex of the head ; 

 second joint shorter than the third, third shorter than the fourth ; 

 fifth shorter than the fourth, but longer than the third. Ros- 

 trum stout, reaching the base of the abdomen, inserted in front 

 of the base of the antennae ; basal joint short, not reaching the 

 base of the head; second joint longer; third longest; fourth longer 

 than the first, but shorter than the second. Body elongate, 

 broadest across the middle of the thorax, thence tapering gradu- 

 ally to the posterior extremity. Thorax hexagonal, with the 

 lateral and posterior angles rounded, the anterior and posterior 

 margins emarginate. Scutellum reaching a little beyond the 

 centre of the abdomen, with the lateral margins waved, the apex 

 very broad and rounded. Coriaceous portion of the elytra with 

 the apical margin very oblique ; membrane large, with numerous 

 longitudinal nervures. Posterior lateral angles of the abdominal 

 segments slightly spinous. Abdomen beneath with an obtuse 

 central longitudinal keel ; ventral spine rudimentary. Sternum 

 with two strong central keels forming a deep canal for the re- 

 ception of the rostrum, reaching anteriorly to the first pair 

 coxae, and projecting posteriorly in the form of two short acuti 

 spines beyond the posterior coxae. Legs rather stout; 

 three-jointed; basal joint nearly as long as the two followin 

 together. 



