416 Mr. P. Cameron on new 



rounded behind. Scutellum sparsely, postscutellum more 

 thicklj rugoselv punctured, behind almost impunctate. The 

 apex of the median segment has an oblique slope ; on either 

 side on the upper part are three curved distinctly separated 

 keels. Pro- and mesopleurai closely and distinctly punc- 

 tured ; the base of the metapleurse smooth, except for a 

 narrow row of strias at the base ; the apex and the lower part 

 behind the oblique furrow with shallow round punctures and 

 irregularly striated. Wings dark smoky, lighter behind and 

 below towards the apex ; the stigma ochraceous ; the nervures 

 black. Abdomen black, the apical third of tlie petiole and 

 the fourth segment almost all round brick-red; the red band 

 on the fourth segment is incised at the base on either side. 



A distinct species. There is no known Indian species 

 with which it can be confounded. The apex of the meta- 

 notum is not quite so closely striated as in most of the 

 species. 



Polistes Wattn, sp. n. 



Flavus ; tibiis posticis supra nigris ; alls fulvo-Lyalinis, nervis testa- 



ceis. ^ . 

 Long. 13 mm. 



Hab. Bengal {Dr. George Watt, F.L.S.). 



The third joint of the antennae is nearly as long as the 

 following three united, the apical slightly longer than the 

 penultimate. Front and vertex finely granular, of a darker 

 shade than the face. Clypeus broader than long, the middle 

 at the top transverse, the sides oblique, the apex with the 

 sides oblique, the middle rounded. Mandibles yellow ; the 

 teeth black, of nearly equal size, bluntly triangular. Pro- 

 and mesothorax smooth ; the scutellum has a narrow longi- 

 tudinal furrow in the centre at the base. Median segment 

 closely transversely striated, the furrow deep. Wings fulvo- 

 liyaline, suffused with fuscous ; the second cubital cellule at 

 the top is slightly less than the distance bounded by the first 

 transverse cubital and the first recurrent nervures. Legs 

 coloured like the thorax, except that tJie hinder tibige are 

 black behind, this being also the case with the base of the 

 metatarsus. The base of the petiole, the greater part of the 

 second segment, and to a less extent the base of the third, are 

 jnfuscated, the darkened bands being dilated at the sides at 

 the apex. 



This species has no near ally, and is readily known by the 

 unicolorous body. The clypeus is broader tiian usual ; the 

 antennal keel is broad, forming a large tubercle with a fovea 



