466 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 65. 



Abdomen longer than head and thorax combined ; segment 2 from 

 one-sixth to one-fifth the length of the abdomen ; 3 shortest, 5 longest ; 

 4, 6, and 7 subequal ; segment 4 usually not shorter than 7. 



Legs: Basal half of middle and basal two-thirds of hind femora 

 black; middle tibiae black to dusky; hind tibiae reddish-brown to 

 dusky; front femora may be dusky in basal half, but are usually 

 reddish-brown throughout; front tibiae and all knees may vary 

 from testaceous to reddish-brown. 



Antennae: First funicle plus ring-joint distinctively longer than 

 pedicel ; none of joints quadrate ; club about same width as three pre- 

 ceding joints. Scape black. 



Species medium to large in size. 



Male (pi. 47, fig. 2). — Length 2.25 mm. Praescutum as in female. 

 Pronotal spots occupy one-third to one-half anterior dorsal margin 

 of prothorax and often faint or obscure. 



Propodeal groove deep anteriorly, often disappearing posteriorly, 

 being obscured by rugae; floor of groove often smooth anteriorily; 

 propodeum usually rugose but occasionally granulose. 



Petiole granulose, about same length as hind coxae. 



Legs: Hind and middle femora black except at knees, sometimes 

 only in basal half of middle femora ; front femora dusky to black on 

 dorsal face and remaining parts reddish-brown; hind and middle 

 tibiae brownish to black; front tibiae reddish-brown. 



Antennae : Flagellum with pedicel about the same length as head 

 and thorax combined ; first segment of flagellum not so wide as distal 

 end of scape, as seen in lateral profile. Scape distinctly broadest in 

 distal half, where there is a distinct shoulder ; one-third as broad as 

 long, exclusive of base. 



Type-locality. — Minot, North Dakota. 



Type.— Cat. No. 21769, U.S.N.M. 



Described from many females and males reared from stems of 

 species of Elymus, collected in Minot, North Dakota, by Mr. C. N. 

 Ainslie, and from points in Nebraska collected by Mr. George I. 

 Reeves. It forms galls in the stems of species of Elymus and has 

 not been reared from any other grass. Males normally occur. 



HARMOLITA OCCIDENTALIS. new species. 



Plate 41, fig. 8 ; plate 44, fig. 8 ; plate 45, fig. 2 ; plate 46, fig. 1. 



Female. — Length 2.5 mm. Praescutum regulose. Pronotal spots 

 large, occupying about two-thirds anterior dorsal margin of pro- 

 thorax. 



Propodeum with a continuous, narrow, deep, margined, median, 

 longitudinal groove; propodeum usually granulose, occasionally 

 rugose, and either convex or flat laterad of groove. 



Abdomen longer than head and thorax combined ; second abdomi- 

 nal segment one-fifth the length of the abdomen ; segment 3 shortest, 



