402 Dr. David Sharp on the structure, of tJie 



dage is depressed, is pressed upon by it, so that co- 

 ordinated action between the inferior and the hiteral 

 appendages perhaps exists. 



In this species the open face of the terminal chamber 

 is very large, but is directed entirely upwards, and can 

 be completely closed by the mere apposition of the 

 inferior face of the hemi-elytra ; at the hind margin of 

 the chamber there is a large triangular incrassation pro- 

 jecting anteriorly, and the apex of this process serves as 

 a support to the extremity of the inferior accessory 

 appendage when this is depressed. 



2. Tesseratoma painllosa, Drury. Hab. China. Fig. 

 3, PI. XII. — The position, arrangement, and relations 

 of the pieces is similar to that described in the preceding 

 species, but the shape of the chamber behind, and the 

 texture, sculpture, and clothing of the various parts is 

 quite different. These latter points are probably corre- 

 lative with the striking difference in the colour and 

 texture of the dorsal segments of the hind body in these 

 two species. 



3. Tesseratoma malaya, Stul. Hab. Hills of N. India. 

 Fig. 1, PI. XII. — Simihir to T. nifjripes, but with well- 

 marked distinctions in the form of the lateral appen- 

 dages. 



4. Eusthencs eurytus, Distant (subfam. Tesserato- 

 mhue). Hab. N. India. — The rectal-cauda is here very 

 short, not very broad, and only partially covers the 

 cedeagus ; only the bifid process terminating the latter 

 can, however, be perceived, owing to the great develop- 

 ment of the tlieca : this theca is of a most remarkable 

 nature in this insect, being white and deeply striate, so 

 that when the insect is in the natural condition of damp- 

 ness it has the appearance of an assemblage of minute 

 rods. Whether this be a post-mortem condition due to 

 shrivelling I do not know. The rectal-cauda, in the 

 only specimen at my disposal, is surrounded at the base 

 by a folded and corrugate membrane, and I expect this 

 permits the cauda to be slightly extended downwards so 

 as to cover the theca. The inferior process is sub- 

 acuminate at the extremity and concave in front, similar, 

 in fact, to that of Tesseratoma, but smaller ; the lateral 

 appendages are very different in form from those of 



