ART. 26 WASPS OF SUBFAMILY PSENINAE MALLOCH 15 



Localities : Great Falls, Va. (type) ; Plummers Island, Md., June 

 4, 1910 (A. K. Fisher) ; Glen Echo, Md., June 25 to July 17, 1921 

 and 1922 (J. K. Malloch) ; Cabin John, Md., July 31, 1921 (J. R. 

 Malloch) ; Dauphin, Pa., July 18, 1917 (E. Daecke) ; Tryon, N.C. 

 (W. F. Fiske). 



One specimen listed has mounted with it a spittle-bug {Aphro- 

 'phora quadrinotata Say), which is fully as great in bulk as the 

 wasp. I assume that the wasp intended the bug as provision for 

 its nest, but no data are given on the label as to the circumstances 

 attending their capture. 



PSEN (PSEN) MYERSIANA (Rohwer) 



Mimesa niyersiana Rohweie, Ent. News, vol. 20, p. 324, 1909. (Male and 

 female.) 



I have seen only one specimen in addition to the reared series 

 from which this species was described. A feature of this and the 

 other species from North America with the exception of monticola 

 is the impressed line behind the posterior ocelli, which extends 

 entirely across to the outer edge of each of the ocelli and connects 

 with a similar line at the center which extends forward to the 

 anterior ocellus. This character does not occur in the genotype, 

 at7'a Fabricius. 



Length, 8-10 mm. 



Localities : Wetzels Swamp, near Harrisburg, Pa. (P. R. Myers) ; 

 and Williamsport, Md., May 24, 1915, ace. no. 2888 (J. A. Hyslop). 



The type series bears no indication of where the cocoons from 

 which they were reared were obtained, but many parts of Hem- 

 iptera, all apparently Homoptera, are attached to the outsides of 

 the cocoons. The specimen from Maryland bears a label with nota- 

 tion: " Prov. nest with Acutalis calva''' [^^Micrutalis calva (Say)]. 



PSEN (PSEN) UNIFASCICULATUS, new species 



Male. — Shining black, abdomen glossy, bases of hind tibiae and 

 all tarsi slightly brownish; antennae entirely black; maxillary and 

 labial palpi brownish testaceous; wings hyaline, veins dark. Face 

 densely silvery haired; fasciculate sternal hairs tawny. 



Front with large deep contiguous punctures, which become 

 smaller and more compact as they approach the antennal bases, and 

 sparser behind ocelli ; central third of clypeus produced downward, 

 transverse at apex. Mesonotum with large deep punctures, which 

 are contiguous and more or less striately arranged on most of the 

 disk; propodeum along the sides of the enclosure rather coarsely 

 rugose, becoming very coarsely so on curve and gradually less so 

 below ; mesopleura glossy, moderately coarsely but not contiguously 



