406 Dr. David Sharp on the structure of the 



and exposed in its upper part are the terminal pair of 

 processes of the oedeagiis. 



9. I^Legarhynchns limatus, H.-S. (subfam. Pcntato- 

 mince). Hab. Assam. Fig. 18, PI. XIII. — Passing to 

 the subfamily Peiitatomince, we find the structures not 

 only very different in appearance from those already 

 considered, but evidently distinct in some of their func- 

 tions. First, the position of the open face of the terminal 

 chamber is different ; instead of looking upwards it is 

 directed backwards, and it is more completely withdrawn 

 into the preceding segment ; but when so retracted the 

 structures by which the segment is closed are quite con- 

 spicuous without dissection, or even without the segment 

 being extended or drawn out of its receptacle in the 

 preceding segment. 



In the extremely delicate and elegant M. limatus, the 

 most conspicuous point in these parts is the rectal- 

 cauda ; this is delicately tinted, and extends downwards 

 longitudinally along the segment, which it in great part 

 closes ; it is pointed at the extremity. On each side of 

 it are seen the, also very conspicuous, lateral appen- 

 dages ; these are comparatively slender and free, and are 

 somewhat like curvate compressed horns. The inferior 

 process is a slightly raised, transverse ridge along the 

 floor of the segment, and is emarginate in the middle so 

 that the terminal point of the rectal-cauda fits accurately 

 into it, and thus completely closes the orifice of the 

 terminal chamber. Having only one specimen of this 

 insect in my possession, I am unable to speak of the 

 condition of the oedeagus and the theca ; but the species 

 is an interesting form, as the structures are much less 

 highly evoluted than they are in the next forms of 

 I'entatomijice I shall describe. Our European Acantho- 

 soma tristriatus is somewhat allied in the structure of 

 these parts to Mcqarhynchus, but is still more imperfect. 

 Fig. 19, PI. XIII.' 



10. Nezara sp., near acuta, Dall. (subfam. Pentato- 

 mince). Hab. Madagascar. Figs. 11 a, 116, 12, PL XIII. 

 — This species, for which I am unable to find a specific 

 name, was obtained by the Piev, Deans Cowan at Marosika, 

 twenty miles north of Mahanoro, east coast of Mada- 

 gascar, and is probably undescribed. The terminal 



