304 Annals Entomological Society of America [Vol. V, 
postscutellum joins the side portion and becomes depressed. 
These two lines converge as they pass backward and continue 
to the sides of the base of the petiole. The central portion of 
the median segment extends backward a distance about equal 
to the length of the scutellum then sharply bends downward to 
the petiole, its two surfaces forming nearly a right angle. Both 
of these surfaces bear coarse punctures and hairs. A short 
distance behind the upper posterior corner of the metapleuron 
a long narrow, nearly vertical, spiracle occurs near the anterior 
margin of the latter portion of the median segment. The 
groove separating the metepisternum from the metepinuron 
appears to continue upward and backward into the side of the 
median segment, passing below the spiracle and extending a 
short distance behind it. From a point near the lower end of 
the spiracle this lateral portion appears to become sharply 
compressed into a dorsal, nearly horizontal and a lateral surface, 
the latter being so bent inward that the sides of the insect in 
this region actually overhang. These lateral portions extend 
somewhat farther back than does the central portion so that 
the posterior end of the median segment as a whole has its 
lateral corners projecting farther backward. At its lower 
hinder edge the median segment articulates above with the 
dorsum of the petiolar segment. The surface of the lateral 
portions is more or less coarsely punctured and haired. 
ABDOMEN. The abdomen has six visible segments in the 
female and seven in the male which excepting the first and the 
sixth, seem to have no structures of importance. The part of 
the abdomen behind the petiolar segment viewed either from 
above or below enlarges for a short distance then gradually 
narrows in a regular curve, to where a pair of spines project 
from the surface of the last segment. The sternum of the 
second segment shows a distinct anterior face where it bends 
abruptly downward from its articulation with the posterior 
lower margin of the petiolar sternum, thus giving the middle 
portion of the abdomen its greatest vertical diameter. Behind 
the second segment the distance apart of the dorsal and ventral 
plates gradually decreases. The surface of each segment is 
more or less coarsely punctured and hairy and close to the 
posterior margin of each the punctures are more numerous. 
From these punctures project stiff hairs overlapping the anter- 
ior edge of the next segment beyond, to form a fringe. All 
the hairs are quite decumbent particularly those above. 
