24 CLASSIFICATION OF THE ALEYRODID^. 



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 ot the scutellum and the postscutellum is continued on each 

 side by an acute crosswise welt. The andorsum 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 tlie rear and become perpendicular 

 to each other. Both of these keels are continued in a straight line in 

 thcj 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 dots. 

 Tibise and the tarsi thin ; distal ends of both the tibia and the first 

 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 tlie magnifying glass. 

 Posterior tibia somewhat longer than the others; the tarsal joints in 

 all the legs almost equal in length, the second being about 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 of the second tarsal joint. 



Ends of both wings somewhat angular, but rounded off. The bifur- 

 cation almost rectangular in the forewing, but acute-angled in the 



