452 HYMENOPTERA. 



yellow, the intermediate and posterior pairs slightly stained with 

 ferruginous. Abdomen yellow, the basal margin of the segments 

 black^ and a black line"^ running down the middle of the four 

 basal segments, narrowest on the first and fourth ; beneath, pale 

 ferruginous, with a yellow macula on each side of the second 

 and two following segments. 



The male differs in not having the clypeus elevated, and in 

 being of a paler yellow ; the apex of the posterior femora and 

 tibife have a fuscous spot, and the bands on the abdomen are very 

 slightly interrupted. 



Hab. Northern India. 



73. Cerceris hilaris. B.M, 



Female. Length 5 J- lines.— Black and punctured ; an oblong 

 spot on each side of the face, a transverse lunate one on the 

 clypeus, which is elevated, and the base of the mandibles, yellow ; 

 a yellow spot behind the eyes ; the anterior margin of the cly- 

 peus deeply emarginate ; the scape more or less yellow in front. 

 Thorax : an interrupted line on the collar, a line, or two spots 

 on the scutellum, the post-scutellum, and a large ovate macula 

 on each side of the metathorax, yellow; the wings slightly 

 coloured, the anterior pair with a fuscous cloud at their apical 

 margins ; the legs ferruginous. Abdomen : the first segment 

 with a broad emarginate fascia on its apical margin; the 

 four following segments with a narrow yellow fascia on their 

 apical margins ; the fascia bordered anteriorly with ferruginous, 

 the second segment almost entirely ferruginous ; beneath, simi- 

 larly coloured, but less brightly. 



Hab. Northern India. 



73 a. Cerceris iNTERSTiNCTA. 



Crabro interstincta. Fair. Ent. Syst. Supp. 269. 11. 

 Cerceris interstinctus, Fabr. Syst. Piez. 306. 21. 



Hab. India. 



74. Cekcebis instabilis. B.M. 



Female. Length 4i lines.^ — Head black and punctured ; the 

 hinder margin of the vertex and the cheeks ferruginous ; the 

 mandibles, scape in front, face below the antemne, and the 

 carina between them, yellow ; sometimes a hue above the carina 

 terminating at the anterior ocellus also yellow; the flagellum 

 ferruginous. Thorax ferruginous ; the collar, scutellum, post- 

 scutellum, and the apex of the metathorax more or less, yellow ; 



