568 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



blackish; membrane pale translucent, brachium and a streak 

 beyond apex of larger areole, dusky. 



Food plant : Black ash (Fraxinus nigra) ; occurs during August. 



Canada, Minnesota, New York. 

 X. plagifer (Reuter). 



Acta Soc. Sci. Fenn., xxxvi, No. 2, 51, 1909. 



Length 5 mm., width 1.9 mm. ; pale yellowish testaceous ; anten- 

 nae, calli, usually (male) spot each side of median line on pronotal 

 disk, clavus except claval vein, and spot on apical area of corium, 

 f usco-blackish ; scutellum yellow ; membrane fuscous, but an oval 

 spot on middle of apical half, and within the areoles, distinctly 

 paler; female more broadly pale, the infuscation on apical half 

 of membrane forming a ray at each side behind areoles. 



Food plant: Black ash (Fraxinus nigra) ; occurs during August. 



Canada, Minnesota, New York. 

 X. neglectus Knight. 



Bull. Brook. Ent. Soc, xii, 82, 1917. 



Resembles certain pale forms of pettiti but with left genital 

 clasper much longer and more spatulate toward apex. 



Male: Length 5.4mm., width 2.1mm.; black with pale; 

 antennae f usco-blackish, paler on base of segment i; head with 

 lower half of face fuscous, front pale and flecked with reddish ; 

 carina and a small median dash at middle of vertex, blackish. 

 Pronotum ecarinate, punctuation and pubescence nearly as in 

 plagifer; collar and large median spot or ray on disk, white or 

 pale yellow ; pale ray extending from outer angle of callus along 

 lateral margin of disk to include basal angle; scutellum pale 

 yellowish, mesoscutum blackish. Hemelytra blackish, embolium, 

 basal angle of corium, and cuneus, pale translucent ; membrane 

 uniformly fuscous, in the female slightly paler on middle, but in 

 that case a black ray behind each callus while the lateral margin 

 and basal angle of disk remain yellowish. Legs pale yellowish, 

 hind femora sometimes dusky near apices but never distinctly 

 banded. 



Occurs during June and probably breeds on Fraxinus nigra. 



Michigan, New York. 

 X. pettiti (Reuter). 



Acta Soc. Sci. Fenn., xxxvi, No. 2, 50, 1909. 



Length 5.7mm., width 2.1 mm. ; black; scutellum yellow; some- 

 times with embolium, basal half of corium, and cuneus except 

 apex, pale; front of head and pronotal disk sometimes reddish, 

 lateral margins and basal angles of disk never pale as the median 

 line, except in teneral specimens killed before any black color 

 develops on pronotum; legs pale, posterior femora blackish 

 apically, or with dark color forming two subapical bands. 



Food plant: Fraxinus americana; occurs during June. 



Massachusetts, New York. 



