SUBFAMILY ALEYRODINAE—QVAINTANCE d- BAKER. 433 



is a connecting link between jijiensis and that very peculiar aleyrodid 

 trilohitoides. 



Pupa case (pis. 74 and 75, fig. 1).— Size 1.731 by 1.44 mm., elliptic in 

 outline ; dorsum with a distinct but broad rhachis ; transverse ridges of 

 the abdomen representing the sutures between the abdominal seg- 

 ments; color of case under the microscope yellowish brown, the ridges 

 showing dark brown with hghter yellowish areas between them. Dor- 

 sum covered with a large number of minute transparent tubercle-like 

 structures, on which spine-hke projections are situated, and also very 

 many minute, more or less circular, dark brown markings. The margin 

 is covered with numerous irregular tooth-hke projections, many of 

 which are armed with knobbed spines (pi. 75, fig. 5). Just within the 

 margin there is a series on each side of seven or eight spatulate spines, 

 Uke those seen in fijiensis, one spine being situated near where each 

 dorsal ridge reaches the margin. The vasifoim orifice (pi. 75, fig. 2) is 

 subcordate in outhne, with the anterior margin straight and the caudal 

 portion of the rim extended. A very distinct furrow extends from 

 the caudal extremity of the orifice to the margin of case, and here there 

 is no distinct pore as is usual in the genus, but a comb of teeth 

 (pi. 75, fig. 4). This character approaches very closely the condition 

 met with in species of the genus Aleuroiilatus. Thoracic tracheal 

 folds distinct and ending in a faint, somewhat circular pore (pi. 75, 

 fig. 3). On the margin of the case adjacent to the pore there is a semi- 

 circular sinus, which is armed with about a dozen minute teeth. 



Adults. — Unknown. 



TVpe.— Cat. No. 19057, U.S.N.M. 



DIALEURODES (RACHISPHORA) TRILOBITOIDES, new species. 



Plate 75, figs. 6-11; plate 74, fig. 2. 



Pupa case. — Pupa cases of this species were taken by Mr. A. 

 Rutherford on Harpullia at Peradeniya, Ceylon, August, 1913. 

 What seems to be the same species was taken by Mr. Rutherford on 

 Eugenia operculata at the same place July 27, 1913, and also by 

 Mr. R. S. Woglum, at Royal Botanic Gardens, Ceylon, on an un- 

 known plant, October, 1910. The species shows a remarkable 

 dorsal structure. The ridges of the abdominal segments have become 

 interrupted, leaving a distinctly elevated and entire rhachis-shaped 

 structure not unhke that met with in certain trilobites. The species 

 show affinity with rutherfordi, and through this with Jijiensis. 



Pupa case (pi 75, fig. 6). — Size 1.04 by 1 mm.; shape oval, broadest 

 across the second abdominal segment; color brown to almost black, 

 darker along the median dorsal area; dorsum with numerous promi- 

 nent ridges, as shown in the figure. These ridges are covered with 

 fine hexagonal dark areas, and the submarginal area and the spaces 

 -Proc.N.M.vol.51— 16 28 



