AKT. 26 WASPS OF SUBFAMILY PSENIXAE MALLOCH 43 



Type (U.S.N.M. No. 44218), male, and 1 male paratype, Adelaide, 

 Idaho. June 22, 1927: allotype, same locality, June 24, 1929; and 1 

 male paratype, June 10, 1927. Paratypes : Idaho — Castlef ord, June 

 21, 1929; Milner, July 9, 1930; Paul, June 20, 1930; Oakley, July 1, 

 1927; Hollister, June 21 to August 1, 1930; Ximama, June 20 and 

 August 14, 1930. Utah— Blue Creek, June 28 and August 5, 1929. 

 Colorado — no other data (Baker collection). 



Twenty-six specimens. 



PSEN (MIMESA) MACULIPES Fox 



Psen macuUpes Fox, Trans. Amer. Ent. Soc, vol. 25, p. 17, 1898. (Male.) 

 Psen {Mimesa) nigrescens Rohweb, Ent. News, vol. 21, p. 168, 1910. (Male.) 

 Psen {Mimesa) perplexa Rohwer, Idem, p. 169. (Female.) 



This is the only species of this subgenus known to me in which 

 the abdomen of both sexes is without distinct red markings. In 

 some respects it resembles species of the preceding subgenus, but the 

 upper portion of the mesopleura (eps 2) is rather strongly longi- 

 tudinally striate in both sexes, the petiole of the abdomen is not 

 definitel}'^ trisulcate above except at extreme base, and the pygiclium 

 of the female is closely covered with quite large punctures, each of 

 which holds the base of a decumbent apically directed stiff hair. The 

 antennae of the male are quite noticeably clubbed at apices, the un- 

 derside of the flagellum is broadly yellow except on basal part of 

 the first segment, and segments 2 to 7 have each a rather broad 

 elevated longitudinal glossy line on almost the entire extent of one 

 side, least distinct, or even lacking, on the seventh segment. The 

 female has the antennal flagellum even more noticeably clubbed than 

 in the male and has the basal segment shorter than the next two 

 combined. 



Length, 7.5-8.5 mm. 



Fox's type specimen was from Florida and has not been examined 

 by me, and Mr. Rohwer did not report upon it in his notes on 

 the type. I have carefully examined the type and paratype of 

 nigi'escens in the National Museum and am convinced that they are 

 the same as Fox's species despite the more northern localities. New 

 Jersey and Pennsylvania. The type specimen of perplexa is before 

 me, and I have no hesitation in making the present assignment. Mr. 

 Rohwer in his notes under the original description of perplexa says : 

 '* The female of maculipes Fox is undescribed, and perplexa is very 

 like what we may expect this female to be, yet there are so many 

 differences that perplexa seems distinct from the Florida species." 

 It appears to me that practically all the distinctions are sexual, and 

 there is no good reason why the sexes should be considered as 

 belonging to two species. 



