1887.] 81 



* * * " The body of the female is nearly circular in outline, bright yellow 

 in colour, with more or less translucent blotches. The last segment presents the 

 following characters : the groups of spinnerets are wanting : 



" Only one pair of well-developed lobes, the median, present. These are pro- 

 minent. Each one is furnished with a notch on each side ; the notch on the mesal 

 margin is distad of that on the lateral margin. The second and third pair of lobes 

 are represented by the minute pointed projections of the margin of the body. 



" The margin of the ventral surface of the segment is deeply incised twice on 

 each side of the meson ; once laterad of the first lobe, and again between the rudi- 

 mentary second and third lobes. The parts of the body-wall forming the margin of 

 these incisions are conspicuously thickened. 



"There are two simple tapering plates between the median lobes, two deeply 

 and irregularly toothed or branched plates, extending caudad of each incision, one 

 iisually simple and tapering plate between the incisions of each side, and two or 

 three of the same character laterad of the second incision. 



" The first, second, and third pairs of spines of each surface are situated near 

 the lateral bases of the first, second, and third lobes respectively ; the fourth pair 

 are situated at a little more than one-half the distance from the median lobes to the 

 penultimate segment." 



By a careful comparison of this description of A. i-apax with 

 Signoret's description of A. camellia, we observe that in each species 

 the scale of the female is very convex, that it is more or less trans- 

 parent, and that it is yellowish in its natural state when covering the 

 body of the female insect. 



The body of the female is circular, or nearly so, in each species, 



and the abdominal segment presents the following similar characters. 



In each species there is only one pair of well- developed lobes, 



and on reference to Signoret's figure, we find these lobes are notched 



in the same manner as in Comstock's species. 



On each side of the median lobes the margin is deeply incised 

 twice in A. rapax, and Signoret's figure shows similar incisions, 

 although he does not refer to them in his description. The two 

 simple tapering plates between the median lobes of A. o^apax are also 

 shown in Signoret's figure of A. camellice ; and, lastly, the groups of 

 spinnerets are wanting in both species. 



Therefore, the points of similarity between the two species 

 consist — 



(i.) In similar appearance of scale, 

 (ii.) One pair only of well-developed lobes, 

 (iii.) Two deep incisions in margin of anal segment, laterad 

 of each median lobe. 



(iv.) Two simple plates between the median lobes, 

 (v.) Absence of groups of spinnerets. 

 The characters, however, which are dissimilar in the two species 

 are not less important than those which are common to both. 



