264 THE ENTOMOLOGIST. 



Legs blue ; the tarsi black ; the apex of the hinder femora and the 

 tibiae black ; the basal half of the hinder femora red. Wings fuscous- 

 violaceous, more hyaline in the discoidal cellules. Abdomen blue, 

 shining ; the basal half of the petiole very narrow ; the apical half 

 abruptly dilated, and distinctly narrower than and separated from the 

 second segment, which is constricted at the base. 



Ampulex trigona, sp. nov. 

 Caerulea ; antennis tarsisque nigris, femoribus posterioribus rufis ; 

 alis fusco-violaceis, nervis fuscis. J . Long. 21 mm. 



Hah. Khasia (coll. Eotbney). 



Antennae stout, shorter than the thorax, black, covered with a pale 

 down ; the third joint about one-third longer than the fourth. Head 

 sharply obliquely narrowed behind the eyes ; the vertex has a wide 

 shallow furrow in the middle behind, and is sparsely punctured later- 

 ally ; the front has some elongate fove^e or punctures on the sides ; in 

 the centre over the antennae are some semicircular keels, and one also 

 encloses the front ocellus. The autennal keels are stout, slightly 

 curved, and narrowed at the top ; in the middle immediately above 

 them is a distinct black tubercle. The clypeus is sharply keeled 

 throughout in the centre ; the apex in the middle roundly and broadly 

 projects, and has on either side a small rounded tooth. The eyes dis- 

 tinctly converge above, and are there separated by about the length of 

 the third antennal joint. Pronotum slightly longer than broad, of 

 almost equal width ; in the basal half above is, in the middle, a distinct 

 keel, the space on either side of which is slightly depressed. Meso- 

 notum smooth, the furrows deep ; the space between them darker, of 

 a more violaceous hue than the sides. The median segment is trans- 

 versely striated throughout ; the stria) enclosed by the inner keels 

 being more widely separated ; and those on the extreme outside are 

 stouter and still more widely separated. All the keels reach to the 

 apex, being united there to a stout semicircular keel ; its posterior keel 

 is broadly depressed in the centre. The lower two-thirds of the apex 

 of the segment is closely transversely striated ; the upper part has a 

 keel down the middle, and three or four irregular keels on the sides. 

 The spine on the top is stout, narrowed and transverse above ; below 

 it is a smaller triangular one. The upper half of the propleurae is 

 raised, and distinctly separated from the lower ; below the middle, on 

 the apical half, are a few stout keels ; the upper half of the mesopleurse 

 bears large deep irregular punctures ; the apex of the metapleurfe is 

 striated. Mesosternum with a few scattered, punctures ; the central 

 furrow moderately wide, and with transverse keels. The anterior 

 trochanters, femora, and tibiae are reddish in front ; the four posterior 

 trochanters and femora are bright red ; the hinder claws are stout at 

 the base, and have a stout sabapical tooth. The alar uervures are 

 fuscous. Abdomen smooth, the middle purple ; the petiole with the 

 narrowed basal part short ; the basal part beneath is stoutly trans- 

 versely striated. The head is more sharply narrowed behind than 

 usual, and the legs have more red. 



(To be continued.) 



