152 THE ENTOMOLOGIST. 



Head and thorax densely covered with silvery pubescence. Clypeus 

 smooth and shining, longer than wide ; in the centre of the apex is a 

 broad flat keel, which becomes gradually widened below, and depressed 

 at the extreme point ; on either side of this is a narrower keel ; the 

 sides of the apex are depressed, almost foveate. Mandibular teeth 

 rufous. The raised lower part of the front is rounded below ; it 

 becomes gradually raised, then becomes gradually obliquely depressed ; 

 the upper part is hollowed below in the centre. Base of thorax rounded. 

 Scutellum large, wide ; the post-scutellum with a slight rounded slope, 

 its apex broad, transverse. Abdominal petiole slightly longer than the 

 post-scutellum and metanotum united ; it becomes widened from the 

 middle, the basal part being distinctly narrowed ; it is slightly longer 

 than the second segment, which is bell-shaped, roundly narrowed at 

 the base, without a distinctly narrowed part there. Ocelli •.• . Meso- 

 pleural furrow single, curved below. 



Comes near to P. rejecta, with some of the forms of which it 

 agrees in coloration ; rejecta may be known from it by the angled 

 prothorax, by the post-scutellum being dilated behind in the 

 middle, not transverse, by the metanotum not being furrowed, 

 and the wings are more hyaline. 



Polybia melanocepliala , sp. nov. 



Head and antenna black, the second and following segments of the 

 abdomen fuscous black, the thorax and abdominal petiole dark rufous, 

 the pleurre darker coloured than the mesonotum, the base of the thick- 

 ened part of the petiole with a large black mark ; legs coloured like 

 the thorax, the coxfe darker coloured ; wings dark fuscous violaceous ; 

 the nervures and stigma black. Pemale. Total length, 12-13 mm. 



Eio Purus, Amazons (Prof. J. W. H. Trail). Agrees best with 

 Saussure's Division M. Y. (4). 



Abdominal petiole nearly as long as the metanotum and scutellums 

 united. Body covered densely with a short pale pubescence, which 

 appears golden on the mesonotum. There is a distinct malar space, 

 which is fully as long as the antenual pedicle. Ocelli • .• ; the hinder 

 separated from the eyes by four times the distance they are from each 

 other. Clypeus nearly as long as the greatest width. The space 

 between the antenna is raised, somewhat triangular, the narrowed end 

 below ; the upper part with a short wide distinct furrow. Temples 

 roundly narrowed. There is a short furrow or impressed line on the 

 base of the mesonotum, and a wider one below the tegulae. Scutellum 

 large, wide, not furrowed. Second abscissa of radius one-fourth of the 

 length of the third, and slightly more than the length of the space 

 bounded by the recurrent nervures. Angles of pronotum rounded. 

 There is no sculpture, the entire body being smooth. 



A distinct species. In coloration and size it is very similar 

 to Ajwica cuhitalis, Saus., as figured by Saussure, ' Vespides,' i. 

 pi. xviii. f. 3. 



Polybia sericeihalteata, sp. nov. 



Dark ferruginous, the greater part of the post-petiole and the base 

 of the abdominal segments broadly blackish fuscous ; the base of petiole 



