NO. 2156. SUBFAMILY ALEYRODINAE—QUAINTANCE d BAKER. 431 



typical Dialeurodes. Such species fall into two groups. Those of the 

 first group lack teeth on the vasiform orifice and a rhachis is more 

 or less prominent. At first glance the most extreme of these shows 

 little relation to the typical Dialeurodes. There is no doubt, how- 

 ever, thsit Jljiensis is so related, and this species shows the first indi- 

 cation of the development of a rhachis, which has reached its culmina- 

 tion in trilohitoides. In Jljiensis there is a margmal row of 26 vasiform 

 spines and other intermediate smaller ones. In trilohitoides there is 

 the same row of spines similarly placed, though they are not swoUen 

 to the same extent, and the presence of the rhachis suggested in 

 Jljiensis is here very strongly marked. In rutherjordi the same 

 vasiform spines are present as in Jljiensis, though they are not so 

 numerous, and the dorsal structure is midway heiwQQii Jljiensis and 

 trilohitoides. These species are evidently closely related and may 

 well form a distinct subgenus. 



Pupa case. — Elliptical or oval, light brown to blackish in color; 

 marginal wax tubes represented by rounded or irregular short tooth- 

 like projections; waxen secretion usually absent, though sometimes 

 peculiar waxen dorsal figures present; dorsal disk with a more or 

 less prominent rhachis and often with thickened ridges radiating 

 from it, representing the body segments; no large pores present. 

 Thoracic tracheal folds distinct; the pore area is composed of an 

 outer ring, and within this is the smaller pore opening, which is 

 usually armed with teeth; vasiform orifice broadly subcordate, with- 

 out comb of teeth, but its caudal margin sometimes showing a pro- 

 jection; submargmal area armed with a row of spines, and other 

 spines also sometimes present on the margin. 



Type. — Dialeurodes {Rhachis pTior a) trilohitoides Quaintance and 

 Baker. 



KEY TO SPECIES OF EHACHISPHORA. 



1. Spines on margin of case only about 26 in number and of uniform character, 



trilohitoides. 



Spines very numerous and differing in character, some slightly knobbed and 

 others somewhat vasiform 2. 



2. Vasiform spines about 26 in number and prominent, remaining spines not dis- 



tinctly knobbed; color pale brown and dark brown; no distinct rhachis evi- 

 dent Jljiensis, 



Vasiform spines about 14-16 and not prominent; remaining spines distinctly 

 knobbed; color dark brown; distinct rhachis present rutherjordi. 



DIALEURODES (RACmSPHORA) FIJIENSIS (Kotinsky). 



Plate 73, figs. 1-4. 



Aleyrodes Jljiensis Kotinsky, Bull 2, Bd. Agr. and Forestry, Hawaii, 1907, 

 p. 100. 



Paratypes of Dialeurodes Jljiensis are in the collection of the Bureau 

 of Entomology. This species forms a connecting Hnk between those 



