68 



MISCELLANEOUS EESULTS OF WOEK OF BUREAU IX. 



emergence the pupa case splits at the anterior end, down both the 

 dorsal and ventral sides along the median line, on the dorsal side 

 splitting back to the first abdominal segment. The empty ])upa 

 case is white and delicate. The adult insect of either sex is lemon- 

 yellow, with pure-white wings, without darker markings; the ground 

 color of the body being partially obscured by loose particles of waxen 

 secretions. The adult resembles closely A. citri, the citrus white-fly, 

 but carries its wings farther away from the body, thus leaving more 



of the abdomen exposed. 



A very characteristic feature of 

 tliis species, as compared with 

 any of the Florida Aleyrodidae now 

 known to the writer, is the globule 

 of honeydew which collects over 

 the vasiform orifice, often becoming 

 so large as to conceal the posterior 

 half of the body, and resembling 

 somewhat the secretions of the 

 persimmon Psylla. These globules 

 are extremely viscid and make the 

 handling of leaves infested with this 

 aleyrodid very disagreeable. They 

 collect in large numbers in the 

 waxen secretions on heavily infested 

 leaves (PI. IV, fig. 3) and both 

 they and the secretions become 

 grayish and dust-laden with age. 

 The globules frequently become 

 overgrown by a rank growth of 

 greenish-brown fungus resembling 

 the hyperparasitic species attacking 

 the yellow white-fly fungus, Ascher- 

 sonia iJavocitrina. 



Fig. 20. — The woolly white-fly: Larva of first 

 instar, dorsal view, showing spines and 

 marginal wax fringe. Highly magnified. 

 (Original.) 



DESCKIPTION. 



A detailed description of Aleijrodes howai-dl follows **: 



The ep-gf.— Length, 0.2 mm. to 0.19 mm.; width, 0.1 mm. to 0.088 mm. Uniformly 

 brownit^h in color, smooth, without reticulations or waxy secretions; curved, lying 

 prostrate on leaf, with convex side approximating latter, attached by short stalk 

 arising from convex surface about one-fourth distance from base to tip of egg. Eggs 

 deposited more or less in complete circles; spaces between eggs often filled with 

 waxy secretions rubbed from body of adults. (See fig. 19.) 



a The original description of the pupa by Professor Quaintance has been used but 

 amplified by the writer. 



