170 MISCELLANEOUS PAPERS. 



of joints 3 to 7. Pupa-case with the compound Avax pores and hirge 

 j^rotruding lingula of Aleurodicus. 

 Type, the following species: 



Paraleyrodes (Aleurodicus) perseae Quaintance. 



REVISED DESCRIPTION.'^ 



Egg. — Elliptical, size about 0.24 mm. by 0.12 mm., with stalk unus- 

 ually long ; smoky in color, the shell smooth ; eggs deposited promis- 

 cuously in the white, flocculent secretion of the adults. 



Larva, f.rst stage. — Size about 0.338 mm. by 0.18 mm., subelliptical, 

 very slightly narrowed caudad; yellowish white, with more or less 

 rectangular spots of orange in the abdominal regions, ej^e spots 

 reddish. There is a fringe all around of white wax; on the margin, 

 cephalad of eyes, are six setse, and on lateral margins of thoracic 

 region are three on each side. On caudal margin are six setae, the 

 middle pair of wdiich is considerably longer than others. On ventral 

 surface, just within margin, all around, is a series of sparsely set, 

 small, tubercled seta?. Legs and antennae well developed. Vasiforni 

 orifice practically as in pupa-case. 



Pupa-case.^ — Size about 0.8G mm. by 0.53 mm. (figs. 35, a and h). 

 Subelliptical in shape, with slightly undulate outline. Color, under 

 hand lens, yellowish brown ; empty pupa-case colorless, very fragile, 

 soon falling from the leaf. On the margin, all around, is a fringe of 

 more or less curled, short, wdiite wax ribbons, and over the case and 

 adjacent leaf area are many fragments of white wax rods, of variable 

 length, profusely produced from the seven pairs of dorsal compound 

 pores, which are situated, a pair on cephalic end and six pairs on the 

 abdominal segments, the cephalic two pairs of wdiich are smaller and 

 nearer the median line. The margin, or rim, of each compound pore 



« Extended and corrected from Tech. Ser. S, Div. Eut., U. S. Dept. Agr. (1890), 

 p. 32. 



'' lu tlie descrii)tioii of the waxy secretion, as origiuallj- given (1. c), this was 

 described as follows : 



" There is a profuse dorsal exudation : First, a rather short, downward-curv- 

 ing fringe of pearly white wax, all around, arising from just within margin 

 and curling outward and downward over margin to near surface of leaf. This 

 fringe is hardly continuous but is more or less split apart into ribbons or bands. 

 Second, more dorsally curving columns. These occur in a triangle, one on each 

 side and one at end. These columns of white wax are about as high as pupa 

 case is wide. The pupa-case is almost obscured by this exudation, when viewed 

 from above." 



According to Doctor Morrill's observations the secretion, as above described, 

 is abnormal to this species and is due to the effect of parasitism. Of many 

 specimens examined by him, showing the seci'etion of this character, all were 

 found to be parasitized ; and, on the other hand, this type of secretion was never 

 found on pupa-cases not attacked by parasites. The normal secretion therefore 

 is as described in the text. 



