terminal scgmoit in some male Ilemiptera. 415 



Cauda is a small papillary process, exposed at the lower 

 part of the perpendicular shell-like process that forms 

 the extremity of the abdomen. The lateral appendages 

 are two very slender, small, curved spines, closely 

 applied to the cauda, and not distinguishable without 

 examination. 



29. TarichanitenSyDaWnti (suhfara. Platas2nn(e). Hab. 

 Burmah. Fig. 28, PI. XIV. — The terminal chamber is 

 here also absent, and the small rectal-cauda is exposed 

 at the apex of the body, but is somewhat protected by 

 this being a little concave and somewhat overarched l)y 

 the extremity of the scutellum. The lateral appendages 

 are small curved spines, and the inferior process appa- 

 rently exists as a small piece placed below, and closely 

 applied to the rectal-cauda. 



III. Comparative remarks on the various pieces. 



The posterior or terminal chamber. — The terminal seg- 

 ment of the male in the Pentatomidce consists of two 

 parts — 1, the terminal chamber, which is open above, or 

 both above and behind; and 2, the anterior chamber, 

 which is covered in, and contains, in addition to other 

 structures, some powerful muscles. The general form 

 of the segment is that of a cylindrical or conical body, of 

 which a portion has been sliced off. The separation 

 between the two chambers is effected in larger part by a 

 diaphragm, which descends from the upper part more or 

 less obliquely ; this diaphragm thus forms the anterior 

 wall of the posterior or terminal chamber. 



In a large number of species the terminal chamber 

 has its opening upwards ; in Nezara and a number of 

 others its open aspect is directly backwards ; in Piezo- 

 sternum the growth forming this chamber has become so 

 extensive that it forms a completely closed receptacle, 

 with an opening only in the middle of the roof, while 

 behind it there is formed a portion of yet another 

 chamber, a remarkable phenomenon which I have not 

 found in any other Pentatomid. On the other hand, 

 in the Plataspince, the posterior chamber is absent, but 

 there exist on the end of the body the foundations, as it 

 were, marking out its plan; and in the species of Brachy- 

 platys, figured PL XIV., fig. 26, a portion of the floor of 

 the chamber is present, and in another member of the 



TRANS. ENT. SOC. LOND. 18*J0.— PART III. (SEPT.) 2 F 



