PARALEYRODES URICHII. 83 



particularly dlstally, where it becomes broadly spatulate; longer than orifice, 

 ami bearing distally two pairs of set*. Abdominal segments moderately dis- 

 tinct. Kudiuieutary feet and antennse very evident. 



Adult.— Body of living specimens buff or pinkish in color, marked with white. 

 Wings whitish, but clouded with dusky. These are held almost flat along the 

 dorsum, and do not meet along the middle line. A copious amount of flocculent 

 white wax is secreted, which becomes scattered over the leaf surface, the slug- 

 gish adults resting in little depressions here and there in the waxy covering. 

 Antennae peculiar and apparently of but four joints, due to the evident coales- 

 cence into two joints of the ringed segment.s .'{ to 7. In the forewing there is a 

 single vein, as in Alcywdcs, with a rudimentary branch or fold near basal fifth 

 and a very obscure rudimentary vein at very base of wing. Hind wings with 

 but a single vein. Genitalia in male forcipate, penis bifurcate. Claws long and 

 slender, with central spinous process. In female, length of body, 0.8 to 0.9 mm. ; 

 length of forewing, 0.8 to 0.9 mm. ; width of forewiug, 0.3 to 0.38 mm. ; length 

 of antenna, 0.38 to 0.45 mm.; length of hind tibia,. 0.25 to 0.3 mm. Male pro- 

 portionately smaller. 



Food plants. — Orange, Persea caroUnensls, persimmon (?), avocado pear. On 

 orange this insect infests the older leaves, rarely or never occurring on the new 

 growth as is the case with Aleyrodes citri. 



Doctor Howard has given to the parasite of this species, reared by Doctor 

 Morrill, the manuscript name Encarsia rariegatus. 



Type. — No. 14775, U. S. National Museum. 



Paraleyrodes urichii n. sp. 

 (PI. XXXI, figs. 1-10.) 



Received May 25, 1911, from Dr. F. W. Urich, Trinidad. The host 

 is a species of Pithecolohium, and there were also present on the 

 leaves two undescribed species of Aleyrodes. P. urichii diffei-s from 

 persecB in its larger size and in having clear white wings, whereas in 

 the latter species these are clouded. 



DESCRIPTION. 



Pupa case. — About 0.73 mm. long by 0.51 mm. wide; regularly 

 elliptical in outline. (PI. XXXI, fig. 2). As seen on leaf under 

 hand lens (jDarasitized specimens only are available), the dorsum is 

 quite convex, and the case is prominently raised from the leaf by a 

 vertical fringe all around of white wax. Dorsum of case covered by 

 a layer of dirty white wax, through which the compound wax pores 

 and bod}' segments may be fairly discerned. From the compound 

 wax pores are produced the usual brittle wax rods, though this type 

 of secretion in the present species is evidently meager. From the 

 margin of case all around is a fringe of white Avax more or less 

 broken up into bands or ribbons, extending outward and downward, 

 nearly or quite touching the surface of the leaf. 



Under the mioroscope the color of the nonparasitized individual is 

 yellow. The empty case is colorless. Parasitized .specimens appear 

 darker. 



