268 SPHEGID^. 



492. Passaloecus levipes, n. sp. 



2 ' Head, thorax in front, and abdomen smooth, median 

 segment coarsely transversely striate ; clypeus subtriangular, 

 transverse ; front of the face and head strongly concave ; the 

 cheeks behind the eyes widened ; median segment subcylindrical 

 with the apex truncate ; a wide shallow median longitudinal furrow 

 from base to apex of truncation, face of truncation smooth and 

 shining ; abdomen longer than the head and thorax together, petiole 

 short. Dark obscure green ; the mandibles at base, the scape and 

 basal three joints of the flagellum of the antennae, the trochanters, 

 base and apex of the femora, the tibiae and tarsi of the anterior and 

 intermediate legs, and the trochanters, tibiae and tarsi of the posterior 

 legs, yellow ; wings hyaline and iridescent, nervures and tegulae 

 testaceous yellow. 



Hab. Karennee, 4000 ft., Tenasserim. 5 . Length 8; ex_p. 15 mm. 

 d" unknown. Type in the British Museum. 



Genus NYSSON. 



Mellinus, pt., Fabr. Ent. Syst. ii, p. 285 (1793). 

 Nysson. Latr. Precis Caract. Gen. Ins. p. 125 (1796). 

 Pompilus, pt., Fabr. Ent. Syst. Snppl. p. 246 (1798). 

 Ceropales, pt., Fabr. S>/st. Fiez. p. 185 (1804). 

 Oxybekis, pt., Fabr. Syst. Piez. p. 316 (1804). 



Type, N. spinosus, Fabr. 

 Bange. Both hemispheres. 



Head transverse, as wide as the thorax or a little narrower ; 

 eyes ovate, ocelli in a triangle on the 

 vertex ; antennae inserted at the base 

 of the clypeus, the scape short, wider 

 at apex than at base, flagellum slightly 

 incrassate ; clypeus wider than high, 

 rounded anteriorly ; mandibles uni- 

 dentate. Thorax ovate, the prono- 

 tum transverse; median segment 

 roundly truncate, with a stout spine 

 Fig. 76. on the posterior lateral angles ; legs 



Nysson erythropoda, 2 • t- slender, simple, slightly pubescent. 

 Wings broad : fore wing with one radial and three cubital cells ; 

 the radial cell long, the apex acute, stretching beyond the cubital 

 cells ; 1st cubital cell longer than the 2nd and 3rd united, the 

 2nd petiolate, receiving both recurrent nervures ; the 3rd equal 

 to the 2nd, strongly constricted at top. Abdomen pseudosessile, 

 the apex more or less curved downwards ; 2nd ventral seg- 

 ment produced almost at right angles to the plane of the 1st 

 segment. 



Key to the Species. 



a. Abdomen, basal segments red with lateral 



yellow spots N. rugoaus, p. 269. 



