430 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 51. 



This species is noteworthy by reason of its large pupa case, in 

 this respect resembling struthanthi Hempel, but easily separated from 

 that species by its coloration, shape, and other details, as will be 

 noted on comparison. This species is freely parasitized, four to five 

 parasites being found m a smgle individual — a degree of infestation 

 unusual in related forms. 



Adults. — Unknown . 



Type.— €ait. No. 19056, U.S.N.M. 



DIALEURODES (GIGALEURODES) STRUTHANTHI (Hempel). 



Plate 72, figs. 1-5. 

 Aleurodes struthanthi Hempel, Ann. Mag. Nat. Hist., (7) vol. 8, 1901, p. 387. 



Pupa case (fig. 1). — Size 2.08 by 2 mm.; form almost circular; 

 dorsum not greatly elevated; thorax marked off by a fine but very 

 distinct suture ; abdommal segments marked off only on the median 

 area and there not distinctly so ; color light yellowish brown, marked 

 with dark brown. The subdorsal area is dark brown and this color 

 extends more or less over the dorsal region. A band of dark brown 

 extends across the thorax just cephalad of the suture separating it 

 from the thorax, and is particularly dark just caudad of the opening 

 of the thoracic tracheal folds. A band of dark brown extends around 

 the margin, but this is sometimes broken by lighter areas. The pores 

 of the tracheal folds are situated m the center of somewhat oval 

 yellow areas. The surface of the case is corrugated, and the dark 

 markings follow these corrugations, or sometimes take the form of 

 reticulate areas. The pore of the tracheal folds (fig. 4) is situated 

 almost on the margin and is armed with about nme rather blunt teeth. 

 The fold itself is without sculpturing, but is irregularly wrinkled. 

 The vasiform orifice (fig. 2) is very small, not much larger than 

 the pores of the breathing folds. It is somewhat semicircular in 

 outline, with the cephalic margin straight. The operculum is of the 

 same shape, and almost fills the orifice, obscuring the lingula, which, 

 when the operculum is removed, is seen to be elongate, setose, and 

 armed with two spines (fig. 5). Submarginal area of case promi- 

 nently fluted by sutures of wax tubes, the sutures extending well 

 mesad (fig. 3). 



The above description is based on material received from Dr. 

 H. von Ihering and collected at Sao Paulo, Brazil. 



Habitat. — Pamahyba and Sao Paulo, Brazil, on StruthantMs 

 jlexicaulis, orange, Mechilia jlava, and on an unidentified forest tree. 



Rhachisphora, new subgenus. 



Within the genus Dialeurodes there are a few species which differ 

 from all others in having a marginal row of spines, and this character 

 is united with others which easily distinguish these forms from the 



