NO. 2156. SUBFAMILY ALEYRODINAE—QUAINTANGE cf- BAKER. 361 



spines. Its tip is scarcely visible caudad of the operculum. The 

 orifice is surrounded by a differentiated lobed area, which forms a 

 channel to the caudal margin of the case. This chamiel is longer, 

 compared with the length of the orifice, than in the other species of 

 the genus, and terminates in three rounded tooth-like projections 

 (fig. 8). The margin of the case is armed with a caudal and a latero- 

 caudal pair of eetae. 



Adult. — Unknown. 



Type.— Cat. No. 19062, U.S.N.M. 



ALEUROLOBUS MARLATTI (Quaintance). 



Plate 43, figs. 1-16. 



Aleurodes marlatti Quaintakce, Can. Eut., vol. 34, 1803, p. 61. 



Larva, first instar (fig. 2). — Size 0.288 by 0.192 mm.; form 

 elliptical; color yellowish brown. Margin armed with usually 16 

 pairs of hairs situated on small tubercles, and at each tubercle the 

 case is marked mesad by a small fold or suture. Of the hairs present 

 the first and third caudal pairs are the longest. On the caudal por- 

 tion of the case there are seven pairs of hairs, these near the middle 

 of the case, and the balance on the cephahc portion. On the dorsum 

 the abdominal segments are fairly distinct. The purple eye spots 

 are visible and there are two pairs of fine setae, one pair on cephahc 

 portion of case, cephalad and mesad of the eye spots, and one pair 

 cephalad of the vasiform orifice. The vasiform orifice itself (fig. 3) 

 is somewhat triangular in shape with rounded corners; the oper- 

 culum is broad and short, and nearly fills the cephalic half of the 

 orifice. The lingula, wliich is visible below the operculum, is elongate, 

 ^vith the distal extremity slightly enlarged and setose. 



Larva, second instar (fig. 4). — Size 0.416 by 0.32 mm.; shape 

 elliptical, in some specimens regularly oval; color yellowish broviTi, 

 wdth orange markings due to the internal structure. Margin (fig. 5) 

 forming a narrow differentiated band which is divided into a number 

 of irregularly sized somewhat rectangular lobes by sutures extending 

 mesad. A pair of long caudal setae and a pair of minute latero- 

 caudal setae are present. On the dorsum the sutures marking the 

 abdominal segments are easily seen and there is a series of minute 

 pores aromid the submarginal area. The eye spots are dark brown 

 to black. The vasiform orifice (fig. 6) is triangular and the opercu- 

 lum fills about two-tliirds of the orifice. The hngula (fig. 7) is almost 

 entirely obscured by the operculum, but when this is removed it is 

 seen to be elongate, with a shghtly swollen, setose distal extremity, 

 which is pointed and armed with two prominent spines. The oper- 

 culum is darker than the rest of the case. 



Larva, tldrdinstar (fig. 8) . — Size 0.656 by 0.544 mm. ; outline elhptical, 

 tending to oval; color rather dark brown, with eye spots almost black. 



