NO. 2156. SUBFAMILY ALEYRODINAE^QUAINTANCE tC BAKER. 415 



the distal extremity with two circular sensoria. These last (fig. 6) 

 are composed of a central thumb-iike process surrounded by a ring 

 on which three or four stout bristles are situated. Somewhat prox- 

 imad of these two sensoria is a rather long but not easily distinguished 

 spme. Segment IV 0.021 mm. long, subcyhndric, and armed with 

 four or five fine transverse sensoria; segment V subcylindric, about 

 0.036 mm. long and armed with seven or eight transverse sensoria 

 and a distal circular sensorium. Segment VI subcylindric, about 0.03 

 mm. long, armed with six or seven transverse sensoria, and at about 

 its middle with a long spine. Segment VII 0.057 mm. long, tapering 

 considerably distad, and armed on its proximal portion with a num- 

 ber of famt transverse sensoria. On the basal third there is situated 

 a long spine, and the distal extremity is tipped with a very prominent 

 spine measuring 0.027 mm. in length; the long spines arming the 

 segments, with the exception of the distal spine, are very difficult 

 to see in some specimens and in some do not appear to be present 

 at all. The antennae of the adult are considerably different from 

 those of citri — first, as regards the length of the respective segments; 

 secondly, the sensoria are much more numerous and smaller; and 

 thirdly, the distal spine is about as long as in citrifolii. 



Adult male. — Similar to the female in general appearance, but 

 somewhat smaller; length from vertex to tip of claspers from 0.88 

 to 1.04 mm.; forewing, length 0.96 mm.; hind tibiae 0.336 mm.; 

 hind tarsus, proximal segment 0.112 mm., distal segment 0.08 mm. 

 The claspers (fig. 8) are about 0.12 mm. long, and 0.075 mm. broad 

 at the shoulder. They are tapering, upcurved, and armed with a 

 few spines and hairs. The penis is about as long as the claspers, 

 is curved dorsad, bulbous at the base, and narrowed distad. 



DIALEURODES (DIALEURODES) FODIENS (Maskell). 



Plate 66, figs. 1-4. 

 Aleurodes fodiens Maskell, Trans. N. Zealand lust., vol. 28, 1896, p. 433. 



Pupa case (fig. 1). — The pupa case of this species is the smallest 

 in the genus thus far known, measuring only 0.8 by 0.72 mm.; 

 the margin is entire, though faint sutures arc evident, extending 

 mesad through a narrow, evident submarginal area. There are no 

 distinct caudal or thoracic tracheal folds or pores, and in this regard 

 it differs from the other species. The remaining characters and 

 general appearance, however, undoubtedly place it here. The tho- 

 racic and abdominal segments are plainly marked off by fight yellow 

 sutures on a median dark brown area; derm of dorsal disk shagreened; 

 the remaining portion of the case is yeUow to almost transparent; 

 the eyespots are large, granular, and purple in color; the vasiform 

 orifice (fig. 2) is elongate cordate; the rim thick and the cephaUc 



