19 
seen at the same time. Found in Pennsylvania from August to the 
middle of October." (Haldeman.) 
Am. Jn. of Sci. and Arts., Vol. IX, 1850, p. 108. Signoret, Ann. de la Soc. 
Entom. de France, Dec, 1867, p. 397. 
3. Aleurodes acacise n. Bp. (Plate I, figures 4-7, and Plate VII, figure 68.) 
Egg. — Size about 0.18 by 0.092 mm. ; curved, yellowish, and marked 
with rather indistinct polygons. Stalk short, and attached somewhat 
to one side of the end, on the convex curve. 
Larva. — Full-grown larvae are difficult to separate from pupa-cases. 
Larva? are brownish yellow, even when quite small, and secrete the 
marginal fringe of wax as in pupa-case. In older larvae the marginal 
rim is quite evident, and the cylindrical tubercles are present, though 
not so numerous as in pupa-case. 
Pupa-case. — Size about 0.92 by 0.61 mm.; shape subelliptical, nar- . 
rowed somewhat, cauded and cepnalad. Color on leaf, under hand 
lens, when wax is removed, shining black. Under microscope, by 
transmitted light, dark brown. In less mature specimens, ease is flat, 
but later becomes moderately convex. There is a rather short and 
squarely trimmed marginal fringe all around from the lateral wax 
tubes, extending out flat on the surface of leaf. In the older speci- 
mens there is a dorsal white waxy secretion, which typically occurs in 
three longitudinal lines, a broad central one and a narrower stripe. on 
each side. These lateral stripes may not extend but along the abdomi- 
nal region, or frequently quite along the entire dorsum and more or 
less parallel to margin of case, forming somewhat of an ellipse. A 
transverse stripe of this exudation may occur on dorsum, thus uniting 
the three stripes. 
Dorsum of case is much corrugated. In younger specimens a 
medio-dorsal ridge is evident, and on each side is a furrow. Cen- 
trally, the abdominal segments are quite distinct. There is a distinct 
and wide marginal rim. somewhat wider on the sides. This rim is 
plainly demarked from dorsum by a thickened line all around. The 
lateral wax tubes are quite prominent and extend mesad to Dear this 
thickened rim; the margin is crenulated, the incisions quite uniform 
and acute. There is on this marginal rim a row all around of short 
cylindrical papilhe. These are truncate distally and appear as short 
circular discs when seen from above. On caudal end of dorsum, just 
within margin, is a pair of slender seta' projecting somewhat beyond 
margin. The caudo-lateral pair is present, though slender and longer 
than usual. There is also on cephalic margin of case a pair of seta' 
quite similar to these latter. 
Vasiform orifice small, tubercle like. Orifice suheircular, about 18 
broad as long. Operculum relatively large, of the same outline as ori- 
fice, which it almost tills. Lingula about four-fifths length of orifice. 
