116 HYMENOPTERA. 



riidbeckicB, and has the most conspicuous yellow markings of 

 all the species. So far it is only known from the localities 

 above mentioned, which are only a short distance apart, so 

 its range would appear to be limited. 



PKOSOPIS TKIDENTULUS Ckll. 1896. 



1896. P. tridejiiulus , Ckll. Psyche Supp. 7 : 27. 



1896. P. tridens, Ckll. Psyche Supp. 7 : 28. 



1898. P. tridentuliis, Ckll. Ent, 1898, p. 217. 



IQQl. P. tridentulus,l.ow. Ent. News. 12:9. 



1903. P. tridentulus, Ckll. Psyche. 10 : 74. 



1906. P. tridentidm, Ckll. Bull. Amer. Mus. Nat. Hist. 22:423. 



Male, — Distinguished by its large size, heavily punctured abdomen, 

 .short, curved, upper extensions of lateral face marks, narrow at tip; 

 and its dark collar. 



Rather large, about 7 mm. long, slender. Clypeus short, broad at 

 apex, as broad as long, usually narrowed at base. Supraclypeal area 

 below antennal sockets very long; scape large, swollen, not concave 

 laterad. Metanotum comparatively long, over half the length of scu- 

 tellum ; pronotum large and prominent. 



Sculpture. — Front, vertex, and occiput, densely, confluently punc- 

 tured, punctures extending down on to cheeks. Pronotum heavil}^ 

 punctured; mesonotum densely, almost confluently punctured, punc- 

 tures smaller than on vertex ; scutum similarly but more sparsely 

 punctured ; metanotum rugoso-punctate, almost pitted. Posterior 

 face of propodeum small, not bordered by a ridge, rounded above ; 

 bowl of enclosure iong, broad, base and sides with elongate, sub- 

 quadrate pits ; neck of enclosure narrow ; lateral areas of posterior 

 face, and sides shallowly, confluently punctured. Mesopleura shining, 

 densely punctured, punctures about same as on mesoscutum ; meta- 

 pleura striate. Abdomen heavily punctured ; first segment shining, 

 punctures wide apart ; second segment much more densely punctured, 

 especially at base, punctures about size of those of mesoscutum ; apical 

 segments with more shallow, larger, and more coarse punctures ; 

 punctures on all segments more heavy laterad, and sparse, large and 

 shallow on venter. 



Yellow 7^/a/f/«^5.— Supraclypeal mark very long, extending well 

 above antennal sockets ; lateral face marks short, upper processes 

 small, inner margin following outline of antennal sockets, usually con- 

 fluent with them ; outer margin leaving orbit on level with base of 

 antennal sockets, curving gradually around to narrow apex ; labrum 

 and mandibles with yellow spots, (fig. 86). Tubercles and usually 

 spots on tegulae yellow. Legs with front of fore tibite, basal half of 

 middle and hind tibae, and basitarsi yellow. 



