June 19, 1 9 1 6 A leyrodidae 461 



as occurring abundantly on species of Citrus and is regarded as of con- 

 siderable economic importance. 



Pupa case (fig. i, A). — Length 1.36 mm.; width 0.96 mm.; shape elliptical to 

 oval, broadest across the third abdominal segment, narrowest cephalad. Dorsum 

 with a moderate central abdominal ridge on which the abdominal segments are not 

 distinctly marked off, though they may be distinguished. Submarginal area some- 

 what flat; suture separating the thorax and abdomen quite distinct; stuface appearing 

 somewhat granular or faintly corrugated , an appearance which may be due to difference 

 in pigmentation. Dorsum with numerous heavy spines (fig. i , E) which after clearing 

 remain black at the tips, but are otherwise a clear greenish yellow. These are arranged 

 as follows: On the submarginal area is a more or less even row of usually 32 spines. 

 This row is composed of two series alternating with one another. The one is made up 

 of spines averaging about 0.288 mm., and the other of spines averaging 0.192 mm. in 

 length. Near the medio-dorsal abdominal line there are three pairs of spines, one 

 pair situated about 0.19 mm. anterior to the vasiform orifice and the others on the 

 cephalic part of the abdominal region. The spines of the pair on the first abdominal 

 segment are somewhat more widely separated than those of the other two pairs. Six 

 other pairs of spines are present on the abdomen. Five of these pairs are short, 

 about o.oS mm. long, and form an even subdorsal row on each side, the rows thus 

 formed diverging on the cephalic part of the abdomen. The remaining pair is com- 

 posed of much longer spines, situated about 0.29 mm. from the thoracic suture and 

 about the same distance from the lateral margin of the case. On the thorax there is a 

 subdorsal row of four spines on each side (fig. i, M) and near the medio-dorsal line 

 another pair of spines is present. Just anterior to the vasiform orifice a pair of tubercled 

 setae is situated, and another pair is present on the medio-caudal portion of case. The 

 margin of the case (fig. i, F) is dentate, the teeth (fig. i, K, L) being rather fine and 

 acute. A distance of 0.16 mm. is occupied by twelve of the teeth. At the base of 

 the teeth small clear areas are found, and some distance in from the margin a row of 

 elliptical areas, possibly glands, are present. These appear to be on the under siu-face 

 of the case, while on the submarginal dorsal region, scattered between the margin 

 and the insertion of the spines, are small dark pores. The vasiform orifice is situated 

 on a tubercle which forms the caudal portion of the medio-dorsal ridge. It is sub- 

 circular in outline, tending to cordate. The operculum is somewhat similar in shape 

 and obscures the lingula. The color of cleared specimens under the microscope is a 

 light brown, with the margin and the borders of the dorsal ridge darker. 



On the leaf the cases are shining black. There is little or no dorsal secretion, but 

 a short , w^hite, waxy marginal fringe is present. The rods forming this fringe are not 

 distinct, but are more or less frayed and give a woolly appearance to tlie outer edgeof 

 the fringe. In some specimens, however, this woolly appearance is not evident, 

 but the wax forms a series of marginal plates. WTien the pupae are removed from the 

 leaf, their former position is marked by the white oval wax ring which remains 

 attached to the leaf. The larvae present a similar appearance on the leaf, but are 

 brown instead of black. 



Adult male. — Length 0.96 mm.; general color brownish, shaded with dusky. 

 Vertex rotmded, with a longitudinal median ridge, color dark brown; ocelli clear; 

 compound eyes Vandyke, constricted; antennae absent in the specimens at hand; 

 labium tipped with dusky; thorax shaded with dusky. Forewings 0.88 mm, long 

 by 0.35 mm. wide, marked with dark bluish gray, as indicated in fig. i, H. Veins 

 olive color; radial sector bent caudad at 0.4 mm. from the distal end. Hind wings 

 0.64 mm. long and 0.25 mm. wide at widest part; color uniform dusky, vein olive 

 color. Legs with the femora and the proximal half of the tibiae dusky, the remainder 

 of the tibiae and the tarsi greenish yellow. Fore femora o. 19 mm. ; fore tibia; 0.23 mm. ; 

 fore tarsi, proximal segment 0.08 mm., distal 0.064 mm.; middle femora 0.24 mm.. 



