318 APPENDIX. NAUCOEID^, 



tibise, the anterior margin very strongly and prominently ridged^ 

 two pairs of tubercles behind middle on basal third, the posterior 

 pair larger and with foveate apices, basal margin very strongly 

 sinuate, the posterior angles lobately rounded, the whole surface 

 thickly minutely granulose ; scutellum finely transversely striate ; 

 hemelytra mottled with brownish, the costal margin distinctly 

 paler, preceded by a broken linear blackish fasciate line ; mem- 

 brane darker, reticulately veined, extending to little more than 

 half of the last true abdominal segment ; abdominal appendices 

 apparently mutilated ; prosternum with an impressed central 

 longitudinal line ; abdomen beneath with a fine central longi- 

 tudinal ridge, the lateral segmental margins with distinct, short, 

 transverse impressions ; posterior tibiae about as long as posterior 

 femora, inwardly clothed with some long setose hairs. 



Length excl. abd. append, $ 30 millim. 



Hab. Nicobar Islands (Ror/ers, Coll. Dist.). 



The typical specimen on which this species is founded has been 

 examined and described by Dr. Montandon, who is recognized as 

 our undoubted authority on this and allied families of aquatic 

 Ehynchota. 



Family NAUCORlDiE. (Vol. Ill, p. 25.) 



Genus GESTROIELLA. (Vol. Ill, p. 27.) 



3094. Gestroiella insigiiis, sp. n. 



Head slightly longer than breadth between eyes, testaceous 

 brown, slightly transversely wrinkled and in places obscurely finely 

 granulose ; pronotum testaceous brown, on disk and anterior 

 marginal area distinctly transversely striate, centrally depressed, 

 the lateral margins oblique, slightly rounded, the posterior angles 

 broadly acute and directed backward over the base of the hem- 

 elytra ; scutellum testaceous brown ; hemelytra pitchy brown, 

 thickly finely punctate, about basal half of lateral margins and the 

 internal suture distinctly paler in hue ; connexivum testaceous 

 brown, the first two (visible) segments posteriorly distinctly 

 bi-spinose ; body beneath testaceous brown, abdomen becoming 

 piceous on apical area ; anterior legs testaceous brown, inter- 

 mediate and posterior legs ochraceous. 



Length 17^ millim. 



