Uebei- Ampiilex Jur. (s. 1.) und die damit enger verwandten Hymenopteren-Gattungen. ^i3 



2. Trirogma prismatica Smith. 



Trirogma prismatica Smith, Journ. Proc. Linn. Soc. Zool., II, pag. gg, cf . . 1858 



»T. fulgide caeruleo-viridis; abdomine purpureo et violaceo lavato. 



»Male. Length 6 lines. Brilliant green, the abdomen vivid purple or violet in 

 ditferent Hghts, highly prismatic the palpi and mandibles white, the latter ferruginous 

 at their apex; the scape of the antennae green with purple reflexious the flagelluni 

 fuscous; the face below the antennae, the scape, cheeks and mandibles, thinly covered 

 with long white pubescence; the head coarsely punctured; a deep transverse impressed 

 line behind the ocelli, the vertex impunctate. Thorax: the prothorax forming a neck, 

 with two elevated tubercles behind; the mesothorax with three or four transverse ele- 

 vated carinae at the base, the spaces betvveen rugose; the disk behind, smooth and shin- 

 ing; the scutellum with an elevated shining tubercle in the middle; the metathorax 

 smooth and shining, with an elevated carina traversing its margins; the lateral margins 

 produced at the sides into a blunt angle or tooth; the disk with two longitudinal carinae 

 which curve towards the sides, then inwardly towards the apical margin, not quite 

 meeting in the centre; between the curved carinae are two central and two lateral ones, 

 none extending to the outward ones; wings subhyaline and splendidly iridescent; the 

 thorax at the sides and beneath, and also the abdomen, thinly clothed with white 

 pubescence; the third segment above, with scattered short white hairs. Abdomen very 

 delicately and distantly punctured. 



»Hab.: Borneo (Sarawak). 



»This beautiful species is very distinct from the Trirogma caerulea, the only 

 species previouslv known; the antennae are much longer and perfectly filiform, the 

 apex of the joints not thickened as in that species.« 



