462 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 55. 



out its entire length ; propodeum rugose within and laterad of groove, 

 though occasionally granulosa ; when without groove or when there is 

 only a trace of groove the propodeum is granulose; groove usually 

 broadest near center; entire floor of groove is rugose. 



Abdomen quite slender, longer than head and thorax combined; 

 second segment from one-fourth to one-fifth the length of the 

 abdomen, exclusive of 1; 3 shortest, 5 longest; 4, 6, and 7 subequal; 

 rarely 6 equals 5. 



Legs : Basal one-third of all faces and two-thirds of upper face of 

 front femora blackish, middle and hind legs black; front tibiae 

 testaceous to dusky ; knees testaceous. 



Antennae: First funicle plus ring-joint as long as pedicel; seg- 

 ment 4 of funicle usually quadrate, rarely longer than broad ; 5 often 

 longer than broad; club joints scarcely quadrate. Scape black to 

 brownish. 



Species small to medium in size. 



3Iale (pi. 46, fig. 2). — Length 1.5 mm. Praescutum as in female. 

 Pronotal spots small, scarcely visible from above. 



Propodeum granulose or rugose, with or without groove. 



Petiole granulose, longer than wide, but not twice as long, about 

 equal in length to hind coaxe. 



Legs black, except at knees, which are dusky brown ; ventral sur- 

 face of front femora and front tibiae dusky brown. 



Antennae : Flagellum with pedicel equal to or shorter than head 

 and thorax combined; scape as seen in lateral profile about same 

 width throughout and about four times as long as broad, exclusive 

 of base; about same width as first flagellar joint; there is a distinct 

 shoulder near distal extremity. 



Type-locality. — Penn Yan, New York. 



Type.— C^t. No. 21765, U.S.N.M. 



Described from many females reared in cages under artificial con- 

 ditions, and from specimens reared from stems of species of Agro- 

 pxjTon collected in New York, Pennsylvania, Ohio, Indiana, and 

 Michigan. 



This species breeds only in species of Agropyron^ in which it forms 

 galls that are usually inconspicuous, but occasionally the galls are 

 formed in the sheath that surrounds the head very much the same as 

 the galls of H. vaginicola. 11. atlantica is normally thelyotokous, 

 males rarely occurring. 



HARMOLITA ELYMOPHILA, new species. 



Plate 41, fig. 1 ; plate 44, fig. 4 ; plate 45, fig. 8 ; plate 47, fig. 10. 



Female. — Length, 3.0 mm. Praescutum rugulose. Pronotal spots 

 very large, occupying three-fourths anterior dorsal margin of pro- 

 thorax ; they diffuse somewhat, giving the prothorax a brownish tint 

 dorsally and laterally. 



