ART. 20. ICHNEUMON-FLIES OF TRIBE PANISCINI CUSHMAN. 23 



species is not synonymous with geminatus as defined here nor with 

 the new variety described. The types of all three of Ashmead's 

 species and of Viereck's one species are in the National Collection 

 and are part of the material studied. 



I am not at all convinced that all of the species recognized in this 

 paper are distinct, because the range of specific variation in struc- 

 ture, sculpture, and color is very difficult, at present apparently 

 impossible, to determine. I have therefore made use of the most 

 obvious available characters for the definition of species, realizing 

 that most of these characters are subject to variation, but believing 

 that the key will be found workable for a very large percentage of 

 all specimens. Most of the species recognized have been confused 

 with geminatus (Say) . 



KEY TO SPECIES OF PANISCUS FROM NORTH AMERICA NORTH OF MEXICO. 



1. Scutellum not at all margined laterally; head'and thorax polished; notauli 



evident only anteriorly; highly ornamented with yellow... pulcher, new species. 



Scutellum margined laterally at least at base; head and thorax distinctly punctate; 



notauli usually strong throughout 2. 



2. Propodeum with a median rounded elevation near base, without carinae but the 



apical carina represented on each side by a rounded tubercle; scutellar carinae 

 extending only about half way to apex; metapleurum roundly elevated above 



at apex; a very large species trituberculatus, new species. 



Propodeum not as above... 3. 



3. Propodeum coriaceous, not or barely transversely aciculate. 



immaculatus Morley. 

 Propodeum more or less distinctly transversely aciculate 4. 



4. Hind femur distinctly less than two-thirds as long as tibia, rather stout; face 



(measured from antennal foramina to clypeal fovcae) distinctly broader than 

 long; clypeus broad and broadly concavely truncate, the basal groove hardly 

 arched above level of foveae. 5. 



Hind femur slender, at least two-thirds as long as tibia; face usually as long as 

 broad; clypeus not broad, narrowly truncate, basal groove arched above level 



of foveae... _.. - 11. 



6. Antennae short, stout, the middle flagellar joints nearly quadrate 6. 



Antennae longer and more slender, the middle flagellar joints nearly or quite 

 twice as long as thick. _.. ,^. 7. 



6. Occipital carina strong except medially above brevicornis, new species. 



Occipital carina very weak caviverticalis, new species. 



7. Temples as broad as eyes or nearly... 8. 



Temples much narrower than eyes 10. 



8. Scutellum practically immargined; clypeus transversely elevated, margin re- 



flexed clypeatus, new species. 



Scutellum margined to apex; clypeus flat or nearly 9. 



9. Antennae much shorter than body; temples fully as wide as eyes; eyes nearly 



flush with surface of head temporalis, new species. 



Antennae about as long as body; temples hardly as wide as eyes; eyes somewhat 

 bulging pardalis, new species. 



10. Antennae shorter than body, joints beyond middle distinctly less than twice as 



long as thick; tibiae and tarsi with many conspicuous spines, those of hind 



basitarsus nearly as long as diameter of the joint. spinipes, new species. 



20183— 25— Proe.N.M.vol.64 32 



