NO. 2156. SUBFAMILY ALEYRODINAE—QUAINTANCE d- BAKlJ/i. 425 



The suture separating the abdomen from the thorax is not distinct 

 in all specimens and the thorax is remarkable in being of about the 

 same length as the abdomen. On the outer margin of the dorsal 

 disk, extending all around the case, there is a ring composed of one 

 or two rows of papilla-like pores (fig. 1). The vasiform orifice 

 (fig. 2) is considerably broader than long, measuring the orifice 

 proper, but the outer margin of the orifice extends cephalad, making 

 the depth of the entire structure almost equal to the width. The 

 inner lateral and caudal margin of the orifice is armed with usually 

 16 prominent rounded fimbriae, or teeth. The cephalic margin of 

 the orifice proper is straight; the operculum almost entirely fills the 

 orifice, being somewhat triangular in shape. The tracheal pore 

 (fig. 4) has no distinct fimbriae, but has an irregular rim. The fold 

 is marked with a number of suture-like markings extending mesad, 

 and a large number of dots similar to those on the folds of citri are 

 visible. These, however, are not upon the dorsal derm of the fold, 

 but on the ventral portion as seen by focussing through. 



The species can be easily distinguished from others in the genus 

 by the marginal hairs, the ring of papilla-hke pores on the border of 

 the dorsal disk, and by the large bright red dorsal marking. 



Adults . — Unknown . 



Type.— Csit. No. 19052, U.S.N.M. 



Rabdostigma, new subgenus. 



Somewhat related to the subgenus Rusostigma is the species radii- 

 linealis from Ceylon. This species is as yet the only example of this 

 type, wherein the polygonal areas of the tracheal fold, as shown in 

 the species of Rusostigma, are replaced by linear thickened lines. 



Pupa case. — Subcircular, usually yellowish, margin almost entire, 

 the wax tubes being merely portions of the margin which are sepa- 

 rated by sutures extending mesad; waxy secretion usually absent; 

 dorsal disk without sculpturing or large pores and with no develop- 

 ment of a rhachis; thoracic tracheal fold ending near the margin in 

 a pore which is armed within with several teeth; fold marked with 

 thickened hnear fines; vasiform orifice roundly subcordate to sub- 

 circular; comb of teeth absent; operculum similar in shape and 

 almost entirely obscurmg the fingula. 



Type. — Dialeurodes {Rabdostigma) radiilinealis Quaintance and 

 Baker. 



DIALEURODES (RABDOSTIGMA) RADULINEALIS, new species. 



Plate 70, figs. 5-8. 



This form is represented in the Bureau of Entomology collection 

 by the pupa case only, which was taken by Mr. C. L. Marlatt, on 

 mistletoe, at New Ava Efiya, Ceylon, January 26, 1902. The species 



