426 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.51. 



is quite distinct by the presence on the tracheal folds of long, linear 

 thickenings of the derm. The immature stages make pits on the lower 

 surface of the leaf, resembUng in this way fodiens and some psyUids. 



Pupa case (fig. 5).— Size 1.76 by 1.6 mm.; outline ahuost circular, 

 form flat; color in normal specimens almost transparent, but in 

 parasitized individuals there are often two brown areas, extending 

 over the thorax and abdomen on each side of the median area, which 

 latter is pale transparent yellowish white, hke the submarginal area. 

 The suture separating the thorax and abdomen is very distinct and 

 transparent. It does not extend to the margin, but curves cephalad 

 and joins two somewhat similar transverse sutures, the three all being 

 very prominent and inclosing two elongate transverse areas. The 

 abdominal segments are not distinctly marked off. The tracheal 

 folds (fig. 6) are easily distinguished, and are marked by a series of 

 fine longitudinal ridges. The pore is situated a slight distance in 

 from the margin of case, and is armed with eight or nine rather dis- 

 tinct projections. The ridges which mark the fold encircle this open- 

 ing on its outer edge, but leave a small, smooth area mesad of it. 

 The vasiform orifice (fig. 7) is subcordate in outline, tending to cir- 

 cular; the cephalic margin is almost straight and the inner caudal 

 margin is without the fine teeth. The operculum is similar in shape 

 to the vasiform orifice, but the sides are compressed. It almost 

 entirely fills the orifice and almost altogether obscures the lingula. 

 The margin (fig. 8) is entire, but the marginal area is marked off by 

 a series of fine sutures extending mesad. 



T^^'^.— Cat. No. 19053, U.S.N.M. 



GiGALEURODES, new subgenus. 



Related to subgenus Rabdostigma in several characters is a small 

 group of species for which is erected the above-named subgenus. 

 Two of the largest known species of the subfamily belong here. 



Pupa case. — Oval to subcircular, color usually yellowish; marginal 

 wax tubes represented by irregular, somewhat shallow corrugations; 

 waxy secretion usually absent; dorsal disk without distinct sculptur- 

 ing and without large pores though numerous minute ones may be 

 present; no rhachis development; thoracic tracheal folds ending on 

 or near the margin in a pore the inner margin of which is often 

 irregularly notched or toothed; fold not sculptured, or sometimes 

 covered with minute circular dots; vasiform orifice small, subcordate, 

 without a comb of teeth; operculum similar in shape and obscuring 

 the lingula. 



Type. — Dialeurodes (Oigaleurodes) maxima Quaintance and Baker. 



