AKT. I't) WASPS OF SUBFAMILY PSENINAE MALLOCH 45 



Remar'ks. — There are apparently four of the described North 

 American species referred to Psen that must be transferred here. 

 Viereck erected the genus Neofoxia for the reception of the species in 

 which the cubitus of the hind wing has its base beyond tlie median 

 transverse vein and inchKles tihialls Cresson and sufvsa Fox in the 

 list of species, but unfortunately he proposed the genus name merely 

 as a substitute for Psen of Ashmead, not of Latreille, and designated 

 Psen atrata Panzer as the genotype, which compels us to accept his 

 genus as a synonym of Diodontus and to propose a new generic name 

 for the North American species. There are several South American 

 and West Indian species in the National Museum collection. i 



KETX" TO THE SPECIES OF GENUS PSENIA 



1. Males 2 



Females 13 



2. Entire mesopleura highly polished, eps 1 sparsely unci shallowly punctured, 



eps 2 entirely impunctate ; area between ocelli depressed in center, with a 

 few very minute punctures, posterior ocelli each with a deep impressed 

 line behind them, which does not extend across between posterior margins; 

 antennal flagellum distinctly clubbed, apical segment at base fully three 

 times as thick as basal segment at its apex, and none of segments with 

 evident elevated line or other modification ; lateral angle of pronotum 

 sharply produced, almost spikelikc ; abdomen black, apices of tergites 



brownish yellow clavicornis, new species 



Mesopleura generally shagreened or alutaceous and rarely very shiny, if 

 almost glossy then with more distinct punctures, eps 2 always punctate 

 or with other sculpturing ; ocellar region not as above, usually quite 

 distinctly punctured ; antennal flagellum not clubbed or very inconspicu- 

 ously so and at least some of intermediate segments modified 3 



3. Antennal flagellum with 3 or 4 of segments toward middle with a quite 



conspicuous shining papillalike elevation on center of one side, the seg- 

 ments immediately basad and apicad of these with a short raised line or 

 carina which does not extend the whole length of segments (pi. 2, fig. 28) ; 

 entire mesopleura very coarsely sculptured, the punctures large, con- 

 tiguous, and deep, giving surface appearance sometimes of being coarsely 

 rugoso-reticulate ; hind tarsi whitish yellow, apical segment browned 

 above : space between mouth margin and black of head on central line 

 moderately wide (pi. 2, fig. 29) ; width of exposed part of third ventral 

 segment not nearly half as great as length of segment on median line — 4 

 Antennal fiagellum more distinctly flattened below, Inner side of flat part 

 usually along entire length of segments 3 to 8 at least with a rather pro- 

 nounced carina in dry material, which in cleared material appears as a 

 bare line, which is slightly depressed and has margin of flat part over- 

 lapping it rather ridgelike, and no segment with well-developed papilla- 

 like elevations; mesopleura not so coarsely sculptured; third sternite 

 wider at anterior margin except in pallidistigma 5 



4. Basal three segments of flagellum lacking sensory elevations; eps 2 and 



prepectus coarsely rugoso-reticulate longiventris, new species 



Basal two segments of flagellum lacking sensory elevations: eps 2 and 

 prepectus coarsely punctate, .sometimes more or less vertically striato- 

 punctate suffusa (Fox) 



