ART. 26 WASPS OF SUBFAMILY PSENINAE MALLOCH 25 



In addition to the above material, I have seen two specimens from 

 Idaho, one taken at Twin Falls, and the other at Castleford, in con- 

 nection with the beet insect investigations. 



PSEN (MIMUMESA?) CHALCIFRONS Packard 



Psen chalcifrons Packard, Proc. Ent. Soc. Philadelphia, vol. 6, p. 401, 1867. 



I have not seen this species, which was described from a single 

 female specimen from Illinois. It appears to me highly probable 

 that it is the same as striatus; it at least is very closely similar to it. 

 The description of the color of the legs in almost every respect agrees 

 with that of longicoDiis^ but without access to the type it is impos- 

 sible to decide the exact status of the species. 



Mr. Rohwer has examined the type specimen and reports that it 

 belongs to the same group as cressoni, in which case it is very close 

 to nigrescens Rohwer, which see. 



PSEN (MIMUMESA) MODESTUS Rohwer 



Plate 1, Figube 11 



Psen (Mimesa) modesta Rohwee, Proc.U.S.Nat.Mus., vol. 49, p. 244, 1915. 

 (Female.) 



This species, described from the female, is represented by three 

 specimens in the National Museum collection and a careful examina- 

 tion of these discloses the fact that it belongs to this subgenus, and 

 to the group in which the mesonotum is distinctly longitudinally 

 striate. In my key above it will run down to " 7." From all three 

 species of the group it differs in having the dorsocentral carina of 

 the petiole with a longitudinal sulcus on only the basal half or less of 

 its extent. The antennal flagellum is black, with a quite evident 

 raised shining line on one side of segments 2 to 8, and rarely a much 

 less evident short shining elevation on segment 9. The enclosure of 

 the propodeum has the central glossy diamond-shaped depression 

 (pi. 1, fig. 11) that is typical of longicorms and hermudenms and 

 which distinguishes it from striatus as accepted herein. 



I believe the species is distinct from the other three with which 

 the striate mesonotum links it but do not include it in my key because 

 it is not North American. 



Length, 7 mm. 



Type. — U.S.N.M. No. 15081, from Mayaguez, Puerto Rico. 



A male specimen in the National Museum from Trinidad agrees in 

 every particular with the type material, even to the large glossy 

 central diamond-shaped part of the propodeal enclosure, the only 

 difference being that the antennal flagellum is not so dark, the 

 general color dark brown or fuscous and not noticeably yellow below. 



Locality. — Caroni River, Trinidad, October 12, 1916, A. 757 (H. 

 Morrison). 



