of some Hemipterous Insects from Boutan. 191 



thickly and coarsely punctured, and somewhat rugose ; inembrane 

 brown. The sides of the abdomen scarcely project beyond the 

 elytra. Abdomen beneath reddish brown, smooth, impunctate. 

 Breast paler, with numerous scattered black punctures, which are 

 larger and closer together on the antepectus ; a large dull wrinkled 

 patch on eacli side of the post and medipectus. Coxae smooth. 

 Legs yellowish brown, mottled with reddish brown ; the two- 

 jointed tarsi are rather paler. Antennse (mutilated) pale yellowish 

 brown, the basal joint, and the others at base and apex, paler. 

 Rostrum pale brown, with the apex darker, and the tip of the 

 basal joint pitchy black. 



Plate XIX., fig. 4u, represents the head seen from above ; 4 b, the 

 head seen from beneaih ; 4 c, a posterior 

 tarsus. 



The Rhaphtgastrides have five representatives in this collection. 

 Of these two belong to the genus Rhaphigaster, Lap., and the rest 

 to Acanthosoma. Of the former, the universally distributed 

 Rfiaph. (A^e^orrt) smaragdulus, Fab., with its variety R. torquatus, 

 Fab., is one ; the second species forms the type of a very dis- 

 tinctly marked sub-genus. It appears to stand between Nezara, 

 Am. and Serv. {Gasiraulax, H. Sch.), and Rhaph'igaster, Lap., as 

 restricted by those authors ; differing strikingly from the former 

 in the length of the ventral spine ; from the second in the strongly 

 developed ventral keel, and from both in the form of the thorax, 

 the form of the head, and several other characters. 



Genus Rhapiiigaster, Lap. 



Sub-genus Prionochilus. 



Head (fig. 5 a) flat above, narrowed anteriorly, the lateral lobes 

 passing the intermediate, and united in front of it ; apex of head 

 rounded, with a very slight notch in the centre. Eyes rather 

 small, very slightly prominent, touching the anterior margin of 

 the prothorax. Ocelli small, situated rather behind the eyes, and 

 nearer to those organs than to one another. Antenna; (fig. 5 a) 

 5-jointed, about half as long as the body ; first joint short, not 

 reaching the anterior margin of the head ; the other joints gra- 

 dually increasing in length towards the apex ; fourth and fifth 

 joints thickest; fourth slightly compressed. Rostrum (fig. 5 6) 

 reaching the base of the ventral spine, of four joints ; the first 

 short, as long as the head, inclosed entirely in a canal, which 

 reaches the base of the head ; second and third joints equal, 



VOL. V. X 



