446 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
portion of pectus usually (often reduced to u small spot at the 
posterior end on each side of the median longitudin:d suture), 
meta-episternum entirely or almost entirely, the upper margin of 
the meta-epimeron narrowly but sometimes broadly, a spot 
sometimes on each side of the post-tergite, the meso- and meta- 
scutellar transverse extensions sometimes, and the meta-post- 
scutellum in greater part. Mesoscutellum generally moderately 
convex; meso-episternum from moderately to quite sharply 
pointed. 
Abdomen. — Ferruginous, usually bright; from two to four 
basal terga, and usually one to two basal terga on the venter, 
black; sides of the basal tergum, and usually the posterior margin 
narrowly, yellow, or pale yellow. 
Legs. — Yellow, or pale yellow (sometimes ferruginous yellow 
and usually in part brownish yellow) ; the following parts black : 
coxae usually slightly at base and sometimes a broad longitudinal 
band on the intermediate and posterior above, trochanters with 
more or less above, a longitudinal band on the femora above 
(widely interrupted sometimes on the intermediate and posterior 
and often on the anterior, the intermediate sometimes black behind 
and the posterior sometimes also blackish before) , a broad longitu- 
dinal line on the anterior and intermediate tibiae above (sometimes 
interrupted), posterior tibiae except more or less of the basal 
portion beneath, and the posterior tarsi except the apical segment. 
Wings. — Fore wings faintly pale honey-yellow, sometimes 
practically hyaline; stigma brown, usually dark brown and paler 
at base; costal cell generally quite strongly translucent; veins 
black, sometimes only blackish. Hind wings hyaline, apical half 
often very faintly clouded; veins from brown to blackish. 
Length. — 11-13 mm. 
Variant 1. — Oblique yellow band on the posterior half of the 
meso-episternum present but narrow and broken, posterior 
femora black except slightly beneath at base [reviota (Mac- 
Gillivray) ]. 
Variant 2. — Oblique j'ellow band on the meso-episternum 
reduced to a small spot near the base of the intermediate coxae; 
coxae in greater part blackish; trochanters black; anterior and 
