﻿20. (21) Maxillary palpi very short, 4-jointed, basal joint very 



small, the entire palpi capable of being concealed 

 within the buccal cavity; parapsidal furrows very 

 distinct, meeting posteriorly so as to enclose a nar- 

 row elongate triangular area. . .Echthrodelphax P. 



21. (20) Maxillary palpi long and conspicuous reaching back 



at least beyond the middle of the head, if laid at full 

 length along the middle line, and generally reach- 

 ing to its hind-margin or behind this. 



22. (25) Vertex of head slightly concave or impressed, never 



convex. 



22). (24) Labial palpi 2-jointed, mandibles 3-dentate, (sec. Ash- 

 mead (Mon. Proctotryp.) Dryinus Latr. 



24. (23) Labial palpi 3-jointed, mandibles 4-dentate, parapsidal 



furrows entirely wanting Ncodryhiiis. 



25. (22) Vertex of head not impressed or concave. 



26. (2'/) Occipital concavity well and distinctly margined even 



at the sides Paradryinus. 



27. (26) Occipital concavity with a very faint margin behind 



the ocelli, which fails at the sides . . Chlorodryinus. 



28. (19) Pronotum attaining the tegulae posteriorly. 



29. (32) Stigma elongate and narrow, generally lanceolate, not 



wide and ovate, or the wings are abbreviated and 

 rudimentary. 



30. (31) Wings fully developed, antennae extremely long and 



thin, filiform, head short on the vertex, more than 

 twice as wide as long Thaiiiiiatodryinus. 



31. (30) Wings minute, rudimentary (mandibles 3-dentate, 



maxillary palpi 6-jointed, eyes conspicuously hairy) 

 Eukocbeleia. 



32. (29) Stigma large of ovate or subovate form, and the wings 



fully developed. 



33. (36) Fourth joint of front tarsi elongate, much longer than 



the third, and articulated to the fifth at a distance 

 from the true apex (or insertion of the pulvillus) of 

 }^ to ys the length of the whole joint. 



34. (35) Maxillary palpi 5-jointed; propodeum long, rounded 



posteriorly (sec. Ashmead Mon. Proct.) 



Chelogyniis Hal. 



35. (34) Maxillary palpi 6-jointed . .Neo chelogyniis. 



