24 CLASSIFICATION OF THE ALEYRODIOE. 
about two and one-half times as wide as it is long. Postscatellum 
very similar in shape, but somewhat smaller in size. The posterior 
margin or the scutellum and the postscutellum is continued on each 
side by an acute crosswise welt. The anclorsum of the metanotum is 
almost as large as that of the mesonotum and is divided by a very 
sharp median furrow into two halves. The dorsa of the metanotum 
are likewise not set off from each other in the center. Behind the 
postscutellum there is an abrupt declivity. 
Abdomen very long and narrow ; the first seven segments are short, 
somewhat flat, almost 1 mm. in width, and having along their 
sides a superior longitudinal furrow ; eighth and ninth segments 
narrower, tubuliform; the eighth as long as it is wide; the ninth 
about 4: times longer than wide. First tergite short, provided in its 
center with three quite distinct, fine, but plainly visible, longitudinal 
keels. Second tergite with one similar median keel. Eighth tergite 
somewhat steeply acclivous toward the rear. At the end of the first 
third of the upper side of the ninth tergite is a small protuberance 
which is indented in the rear part. First sternite very short, pro- 
vided with a fine median keel; second sternite furnished with two 
median keels that are closely crowded together; third sternite pro- 
vided at the front with a small, flatly triangular, somewhat indented 
field, from which issues on each side a very fine but distinct keel. 
These two keels diverge toward the rear and become perpendicular 
to each other. Both of these keels are continued in a straight line in 
the; fourth sternite as far as the posterior covers. Forceps (of the 
male) narrowly oval and very long, at times exceeding two-thirds the 
length of the ninth segment. Penis short. Upper side of the ab- 
domen brownish yellow. In the center of the second tergite there is a 
blackish stripe. Eighth tergite black, its extreme posterior margin 
bordered by a fine brownish-yellow seam. The ventral side of the 
abdomen brownish yellow, with a brownish-gray cast. 
Legs very small and slender, very sparsely and briefly pubescent, 
pale brownish yellow. Femur sprinkled with small brown dot-. 
Tibiae and the tarsi thin; distal ends of both the tibia and the firs! 
tarsal joint pale brown; distal half of the second tarsal joint black. 
The two claws small and quite slender, rusty yellow. An empodial 
appendage (paronychium) is not visible under the magnifying glass. 
Posterior tibia somewhat longer than the others; the tarsal joint- in 
all the Legs almost equal in length, the second being ahout two-thirds 
as long as the first. The two tarsal joints are together about one- 
half the length of the tibia. Length of the claws about one-third the 
Length oi the second tarsal joint. 
Ends of both wings somjewhal angular, hut rounded oil. The bifur- 
catioD almost rectangular in the brewing, hut acute-angled in the 
