522 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvii. 



43. ALEYRODES NIGRANS, new species. 

 Plate XXVII, fig. 3. 



Egg. — Size, 0.23 by 0.11 mm.; dark yellow to a dusky-brown in 

 color, empty shells uniformly brown; the chorion is firm, and the 

 egg", in consequence, keeps its shape and position when empty. Egg 

 elliptical in shape, more curved than usual, apex rather pointed; shell 

 unmarked; pedicel short and at one side of base on the convex curve. 

 Eggs alwa3^s found in an upright position on the under side of the leaf. 



Larva. — When first hatched about 0.3 mm. h^ 0.08 mm.; elongate, 

 elliptical, with dorsum very convex, and having a narrow band of 

 semitransparent wax closely appressed to the margins. Under the 

 lens it is semitransparent and pale yellow in color. Dorsum void of 

 pores, seta^, or exudation; marginal rim distinct, thickened, narrow, 

 noncrenulated, and with two parallel rows of minute transparent 

 spots which extend around it. Lateral margins with seven pairs of 

 short, delicate hairs set in tubercled bases; these extend from the 

 latero-cephalic margin about two-thirds the distance toward the caudal 

 end; the usual caudal and latero-caudal hairs are present, very minute. 

 No trace of segmentation except along dorsi-meson of abdomen. Vasi- 

 form orifice subcircular, bounded by a conspicuous raised rim; oper- 

 culum the same shape, filling the orifice; lingula not seen. Antenna? 

 and legs functional; eye-spots red, divided, circular and subecjual in 

 size. 



Just after the first moult the larva is about 0.4 mm, h\ 0.27 mm.; 

 broadly elliptical in shape. The insect is flatter and has a narrow 

 lateral fringe of glassy rods, which are continuous at ])ase, but are 

 divided distally into irregular plates; all lateral hairs have disappeared, 

 and there are faint, irregular crenulations around the margin; abdom- 

 inal segments distinct along the dorsi-meson; the caudal hairs are 

 much longer than in the first stage, and the beginning of the medio- 

 caudal lobe, which is characteristic of the pupal stage, is evident; dor- 

 sum with -1 pairs of long, tapering spines. A pair on the cephalic 

 region, a pair on the meso-thorax, a pair on the meta-thorax, and a 

 pair on the abdomen, laterad of the cephalic margin of the vasiform 

 orifice. Lingula short, strap-shaped, and densely setose. Eye-spots 

 single, bright red in color. No trace of legs or antenna?. In other 

 respects essentially as in the first stage. 



In the third stage the larva is the same as in the preceding, with 

 the exception that it is darker 3'ellow in color and has a dorso-median 

 keel. 



Piijpi-case. — Size, about 0.!» mm. bj^ 0.6 mm.; shape, oval, pro- 

 longed caudad into a conspicuous pointed lobe, on the lateral margins 

 of which are the caudal hairs. The dorsal disk is much larger than 

 the ventral, and the margintd wax tubes are bent downward and 



