384 Dr. A. S. Packard, Jr's Revision of the 



produced in front as to be angulated as at the base ; the clypeus itself 

 is nearly as long as broad, varying in this respect, not separated from the 

 short, transversely narrow, lateral lobes, which decrease towards the 

 eyes in width, by any suture, though the "foramina" are distinct but 

 small. It is also often raised in the middle, and upturned in front. 

 The labrum is large, produced, triangular revolute, very prominent and 

 well developed, as are the maxillae and labial palpi. Mandibles large, 

 widening towards the toothed, broad, oblique tips. 



The thorax is oval, sub-cylindrical, more elongated than usual. Me- 

 so-scutum shorter than broad, angulated and narrowing behind, much 

 as described in the Crabroninre. It only covers the first third of the 

 notal portion of the meso- and metathorax, differing in this respect so 

 much from that of Grabro. There is a greater similarity in the form 

 and size of the meso-scutellum and the enclosure of the propodeum 

 than usual, which is raised from the side-pieces, and is transversely ob- 

 long. The enclosure of the propodeum is distinct, the margin raised, 

 triangular, from which the sides fall away rather rapidly, but behind 

 incline at a less angle than usual, or the propodeum is more produced 

 (^Passalsecus) and horizontal, and the tip truncated or bent downwards 

 at a right angle. The meso flank is largest and both very convex, 

 bub'ino - out very much at the sides. The limbs are small and slender, 

 short. The coxae are rather slender and long; the hind trochanters 

 are rather slender and sub-triangular. Tarsi, especially the 2d — 5th, 

 are long and cylindrical, and slightly spined. 



The fore wings are shorter than in the three other groups, with the 

 apex rounded, outer margin stout and full. The outer costal is trian- 

 gular, since the 2d sub-costal segment terminates near the ptero-stigma 

 which is thicker and more conspicuous than usual. There are three 

 sub-costal spaces, the 2d small and quadrilateral, and three median 

 spaces, the 1st is short, small, rhomboidal, the 2d is oblique, its axis 

 being parallel with the outer margin, and the two outer sides being of 

 the same length. The 2d internal is about half as long as broad, being 

 shorter and broader than usual. 



Secondaries of moderate width, the discal space is less produced than 

 in the Philanthinse, the lower side or median uervule is much bent up- 

 wards, and the recurrent which closes the space, is farther removed 

 from the outer margin than in the Philanthinse. 



Abdomeu pedunculate; the 1st ring of even width throughout, and 

 varying in length; the abdomen in Passnlxcus being sub-sessile; re- 

 mainder of the abdomen oval, sub-cylindrical, the oval portion is shorter 



