NO. 2156. SUBFAMILY ALEYRODINAE—QUAINTANCE c6 BAKER. 411 



slightly constricted just caudad of the thoracic tracheal pores. 

 Average length of case 1.52 mm. The margin (pi. 63, fig. 3) is armed 

 with a series of minute tooth-like divisions from which suture-like 

 markings extend mesad on the case. These markings are not of equal 

 length, but usually every third one extends farther mesad than the 

 others, giving the effect of a double series — a longer and a shorter one. 

 The submarginal area, with the exception of that portion very close 

 to the margin itself, is similar in structure to the dorsal disk. The 

 sutures are evident upon the dorsum, but not strongly marked in 

 mounted specimens. There are no dorsal spines. The tracheal 

 folds (pi. 63, fig. 2) are prominent, their pores being situated either on 

 the margin or very close to it. The ring of the pore is not armed with 

 fimbriae, or teeth, but is entire. It is, however, covered with series of 

 minute circular markings. The fold itself is without any sculpturing 

 of the dorsal derm, but on focusing down into the case a large number 

 of minute transparent circular areas are visible, as shown in the 

 figure. They are present on both of the thoracic and on the caudal 

 tracheal folds. The vasiform orifice (pi. 63, fig. 4) is almost circular 

 in outline; the inner caudal margin is armed with a varying number 

 of short, acute, irregular teeth. The hngula is not visible, as it is 

 obscured by the operculum. This latter is somewhat semicircular in 

 outUne, with the lateral margins constricted and the cephalic margin 

 straight. The color of the orifice is somewhat darker than that of 

 the remainder of the case, with somewhat more of a greenish cast. 

 Adult female.— The female is yellowish and dusted with white pow- 

 dery wax. When at rest the wings are laid back against the sides 

 of the abdomen. The head, which is covered with fine wax, is on 

 this account white, with the exception of the eyes, which are chocolate 

 brown. The basal segments of the antennae are white, pruinose, 

 while the distal ones are usually yellow tinged with pale red. The 

 wings, owing to their waxy covering, are white and opaque, the thorax 

 and abdomen, as viewed from above, amber colored. There are 

 occasionally seen on the thorax small brown markings. When 

 viewed from below the body is yellow or amber colored, more or less 

 dusted with white wax. The legs are sometimes tinged with red and 

 the labium is tipped with dark brown. Under the microscope the 

 color is yellow, with the eyes dark brown and the oceUi dusky. 

 Length from vertex to tip of ovipositor 1.36 mm. The forewing (pi. 

 63, fig. 1 1) is 1 .408 by 0.64 mm., clear transparent without any shading 

 or marking; radial sector shghtly curved and extending almost to 

 the margin. Cubitus fine, but long and distinct; media rarely rep- 

 resented by a faint shading near the base of the radial sector; 

 remnant of the vein as in species of Aleyrodes. Margin (pi. 63, fig. 14) 

 armed with numerous teeth on which are small hairs. Hind tibia 

 armed with a circle of prominent spines on its distal extremity and 



