432 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.51. 



species exhibiting the typical dorsal structures of the genus and 

 such species as have a prominently developed rhachis. 



Pupa case (fig. 1). — Size 1.5 by 0.95 mm.; outline oval, rather 

 flat; abdominal segments distinct and indicating the development 

 of a rhachis so prominent in other species of the subgenus; color 

 straw yeUow or pale brownish; margin (fig. 2) almost entire, the wax 

 tubes being represented by irregular flattened tooth-hke sections 

 separated from one another by lines extending mesad; submarginal 

 area armed with a series of spines composed of two kinds: The first 

 large and vasiform, the second small and lanceolate. The vasiform 

 spines form a row about the case as showTi in the figure and are 26 in 

 number. The smaller spines are placed in several more or less con- 

 centric rows around the margin. The vasiform orifice (fig. 3) is 

 roundly subcordate, with the margin rather heavily chitinized; the 

 operculum somewhat similar in shape, though narrower caudad; 

 lingula almost obscured by the operculum. Thoracic tracheal pores 

 very prominent, composed of a distinct, even, and heavily chitinized 

 ring, which is present upon the dorsum, and within this ring is the 

 rather elongate irregular opening of the pore proper. Tracheal folds 

 quite distinct, extending mesad from the opening of the pore and 

 not from the margin of the ring. The caudal pore is similar in con- 

 struction to the thoracic marginal ones (fig. 4), but the dorsal ring is 

 not so distinct. A rather well differentiated area extends from the 

 vasiform orifice to the caudal margin, and on the median dorsal area 

 there are a number of vasiform spines similar to, though smaller than, 

 those upon the submarginal area. 



On the leaf the cases are light to dark brown in color and without 

 marginal secretion of any kind. Dorsal waxen secretion very pecu- 

 har, forming, according to Kotinsky, a perpendicular column. It is 

 fragmentary in the specimens at hand. 



Adult female. — According to Kotinsky this is as follows: 



Body (excepting head, which was bent under), 1.12 mm. long. Forewing, 1,406 

 microns long, 700 microns wide. Immaculate, mealy, yellowish white. Abdomen, 

 legs, and antennae, except first two joints of the latter, testaceous; thorax, head, and 

 first two antennal joints, straw color. Eyes slightly constricted, upper lobe consider- 

 ably broader; reddish brown in color. Abdomen with about a dozen eggs distinctly 

 seen ventrally; abdomen 750 microns long by about 325 microns wide. 



Only pupa cases are available to us for study. 



Habitat. — Rewa, Fiji, on pods and leaves of a leguminous plant. 



DIALEURODES (RACHISPHORA) RUTHERFORDI, new species. 



Plate 75, figs. 1-5; plate 74, fig. 1. 



A collection of this species on Loranihus was made by A. Ruther- 

 ford, at Peradeniya, Ceylon, in June, 1913. The species is remarkable 

 in the character of the dorsum of the pupa case. In this respect it 



