126 Annals Entomological Society of America [Vol. VI, 



Thorax: Pronotum dark; nicsoscutum brownish yellow, darker 

 near the anterior edge, mesoscutar parapsida same color or lighter than 

 mesoscutum with a darker spot well forward toward the base of the 

 fore-wing; scapula dark; mesoscutellum noticeably paler than meso- 

 scutum. Behind the mesoscutellum are two narrow transverse plates 

 dark toward their lateral margins and light near the middle, the poster- 

 ior plate with a spiracle near each lateral margin. Marginal and sub- 

 marginal veins of fore-wing nearly equal in length; end of stigmal vein 

 obscurely pointed, not reaching wing margin, its upper side slightly 

 emarginated, its anal margin broadly rounded; a broad dusky band 

 crosses the fore-wing below the marginal vein; hind wing lanceolate; 

 legs pale yellow except the coxse, femora, and basal halves .of the tibiag, 

 these being dark, the coxa being the darkest portion of each leg, those 

 of the hind legs being the darkest; fore-legs as a whole the lightest and 

 the hind legs the darkest; trochanters nearly hyaline. 



Abdomen: Short, broad, nearly quadrangular in outline; quite 

 dark with faint transverse lighter bands and a yellowish brown area near 

 the genitalia: with spines directed backward evident on the sides 

 (above and below also?). 



Male: Length, 0.56 mm.; expanse, 1.54 mm.; greatest width of 

 fore-wings, 0.20 mm. Living and mounted specimens appear the same 

 as females, except that they are smaller, and the mesoscutellum is not 

 as light in color. The antenna differs in that the first funicle segment 

 is as long as the second, and its diameter at its distal end is greater than 

 the diameter of either of the other two funicle segments. Its base is 

 rounded and stalked, and it does not give the effect of a bead as does 

 the corresponding segment in the female antenna. The articulation 

 between the second and third segments of the club is not as evident as 

 between the first and second segments, while in the female both articu- 

 lations are very clear and well defined. The thorax as a whole is darker 

 than that of the female, the only light portions being the mesoscutellum 

 and the portion of the mesoscutar parapsida nearest it. The hind 

 margin of the stigmal vein is more angular than in the female. The 

 faintly cloudy band below the marginal vein is hardly distinguishable. 

 The abdomen is short, much narrower than the thorax, truncate, dark 

 and not showing lighter bands, but lighter near the genitalia which 

 extrude, the tips of these being nearh' hyaline. 



Described from one female type and forty-three paratypes 

 (on twelve slides) and one male type and four paratypes (five 

 slides). The male type (one slide) and the female type with 

 eleven paratypes (one slide) in the collection of the Massachu- 

 setts Agricultural College, Amherst. 



One male and nine female paratypes (two slides) deposited 

 in the U. S. National Museum (Type No. 15453). 



The remaining paratypes male and female together with 

 some female metatypes, have been retained by the author. 



