HYMENOPTERA. 



having a broad dark fuscous cloud at their apical margins, the 

 nervures black, suffused with fuscous ; the legs obscurely blue ; 

 the metathorax transversely strigose. Abdomen adorned with 

 an obscure greenish-blue iridescent pile ; the apex clothed with 

 black pubescence. 



Male. Very closely resembling the female in colour; the 

 antennae porrect, the seven apical segments entirely cream- 

 coloured, with usually three or four additional joints, white be- 

 neath ; the posterior legs very long, the tarsi broad and com- 

 pressed. Abdomen subpetiolate, of an obscure blue-black colour; 

 beneath smooth and shining, the fourth segment thinly covered 

 with black pubescence. 



The number of pale apical joints in the antennae of this species 

 varies greatly ; of four specimens examined (males), the numbers 

 are, three, five, seven, and eight and a half; the number is the 

 same in all the females yet obtained, namely seven. 

 Hab. Brazil (Para). (Coll. H. W. Bates.) 



15. PEPSIS LEUCOBASIS. B.M. 

 Female. Length 14 lines. Black, entirely covered with a 



blue pilosity ; on the mesothorax it has a green tinge, varying in 

 brightness ; the scape has a blue or green tint, the flagelluni black; 

 wings brown-black, with varying shades of purple and violet iri- 

 descence ; the apical margins of all the wings have a narrow 

 white border, the base of the anterior pair to nearly one-third of 

 their length, silvery ; the extreme base black ; the metathorax 

 transversely rugose, the posterior lateral angles slightly pro- 

 duced ; the abdomen of a shining blue. 



The male closely resembles the female, only differing in being 

 more slender, and in having the antennas porrect and the legs 

 more elongate. 



Hab. Brazil; British Guiana. 



16. PEPSIS LUCIDULA. B.M. 

 Female. Length 12 lines. Black, adorned with a bright 



changeable iridescent blue pile ; the legs have a brilliant purple 

 reflection, and the vertex parts of the thorax and abdomen pre- 

 sent a variety of deep black shades in different lights ; the fla- 

 gellum black, the scape blue; the mandibles nigro-piceous ; 

 the articulations of the joints of the palpi pale testaceous ; the 

 clypeus widely emarginate ; the prothorax swollen on each side ; 

 the scutellum striated, but smooth in the centre, which is 

 elevated; the metathorax transversely coarsely rugose-striate, 

 having a longitudinal impressed line in the middle : wings dark 



