Neotropical Vespidae. 383 



space almost twice the length of the antennal pedicle. 

 Ocelli * . ' ; the hinder separated from each other 

 by about one fourth the distance they are from the 

 eyes. Clypeus shining, sparsely but distinctly punc- 

 tured ; its apex is gradually narrowed to a sharp point. 

 Top of apical slope of pronotum raised, the sides dis- 

 tinctly projecting, rounded at the base, obliquely narrowed 

 towards the apex. Scutellum large, roundly convex. 

 Post-scutellum with an oblique slope ; its apex broad, 

 transverse; its base in the middle slightly incised. Meta- 

 notum longish ; it has a straight, oblique slope; its centre 

 has a wide furrow, deep in the middle ; the sides with 

 an oblique slope ; the furrow does not extend to the base. 

 A curved, deep, distinct furrow runs down from the 

 tubercles half way down the mesopleurae towards their 

 apex ; from its centre, where it commences to bend, 

 another much less distinct one runs towards the base. 

 Abdominal pétiole slightly longer than the metanotum ; 

 the basai third is clearly narrowed, becoming obliquely 

 widened towards the tubercles, which are prominent ; 

 the apical part is not much widened towards the apex ; 

 the 2 nd segment is somewhat shorter than the l st ; it is 

 longer than its width at the apex ; the base is obliquely 

 narrowed. The entire abdomen is distinctly longer than 

 the head and thorax united ; the dilated part is 3 times 

 longer than broad. The 2 nd cubital cellule is much narro- 

 wed in front, being there one fourth of the length of the 

 3 rd ; the récurrent nervures are received in the middle. 



Belongs to the group of P. angalicollis Spin. ; the 

 apex of the pronotum is as in Saussure's figure of P. 

 constructor Sauss., but not quite so transverse ; the 

 petiolar tubercles are quite prominent, not „very small" 

 as they are, according to Saussure (Vespides, 1, 185), 

 in angulicollis and angulata. In thèse species the wings 

 are ferruginous ; in the présent species it is only the 

 nervures which are so coloured; the apex of its clypeus 

 is fringed with golden hair. It is quite possible that a 

 good séries of spécimens would show that angulicollis, 

 angulata and centralis are only forms of one species. 

 The two former are from Brazil. In my species the form 

 of the abdomen is as in Synaeca. 



4. Polybia Traili sp. nov. $. 



Black, with the folio wing markings pale yellow: the 

 sides of the clypeus broadly from near the top, its apex 

 more narrowly (the black central mark is dilated above, 



