AKT. 26 WASPS OF SUBFAMILY PSENINAE MALLOCH 9 



8. Petiole of abdomen red; tibiae and tarsi bright orange or fulvous-yellow; 



scape of antennae fulvous, with a brown mark above Carolina Rohwer 



Petiole of abdomen black, rarely slightly reddish on sides and below ; at 

 least the tibiae dark brown or fuscous in part; scape of antennae black 

 or dark brown 9 



9. Pygidial area narrow, at upper extremities of the lateral carinae less than 



half as wide as its length in middle ; tarsi bright orange or fulvous-j'ellow. 



simplicicornis Fox 

 Pygidial area broader, at upper extremities of lateral carinae more than 

 half as wide as its length at center ; tarsi hardly paler than tibiae. 



punctatus Fox 



PSEN (PSENEO) FERRUGINEUS (Viereck) 



Mimesa ferrugineus Viereck, Trans. Amer. Ent. Soc., vol. 27, p. 341, 1901. 



According to notes on the type specimen in Philadelphia made by 

 Mr. Rohwer, this species will run down to kohlii in my key, but it 

 differs from any species I have seen in having the propodeum and 

 basal two abdominal segments and petiole of the abdomen ferrugin- 

 eous. The pronotal lobes and legs are ferrugineous, in which re- 

 spect it is similar to fulvipes. As the females usually are darker 

 colored than the males, it is not probable that the specimen described 

 herein as fulvipes can be the female of ferrugineus^ as the propodeum 

 and abdomen except the petiole are entirely black. 



Length, 12 mm. 



PSEN (PSENEO) KOHLII Fox 



Plate 1, Figuke 4 



Psen koMii Fox, Trans. Amer. Ent. Soc, vol. 25, p. 9, 1898. (Male and female.) 



Fox distinguished this group as the kohlii group, and I have be- 

 fore me some specimens compared with the type in Philadelphia by 

 Viereck and by Rohwer, and one of these specimens bears a homotype 

 label. It may be pertinent to note here that in addition to the char- 

 acters listed in the key for the separation of the subgenera, all the 

 species known to me have the hind coxae with a very prominent linear 

 carina on their inner or opposed surfaces, and that the petiole of the 

 abdomen is much more noticeably curved near base than in most of 

 the other segregates. 



The present species is readily distinguished from its nearest allies 

 by the characters listed in the above key to the species, the bright 

 fulvous-yellow tibiae and tarsi and red abdominal petiole of the male 

 being quite distinctive. The antennal flagellum of the male has the 

 elevations (sensory areas?) rather broad, distinctly shining though 

 not glossy, highest at center, and most prominent on the sixth to 

 eighth segments, the one on the third segment very inconspicuous 



