88 CLASSIFICATION OF THE ALEYRODIDiE. 



the anal aperture and two spots near the anterior margin are always 

 naked. There are fine rents in the waxy crust, which more or less 

 define the limits of the segments. If the crust is removed, the 

 puparium appears brown, fine grained, and of an irregular reticu- 

 lated structure, Avhich is caused by fine lines that are impressed on 

 the body. The limits of the segments are distinguishable only along 

 the middle of the dorsal side. The margin is crenulate. There are 

 no long and robust bristles present. On the other hand, there is a 

 great number of short fine hairs scattered over the whole surface of 

 the dorsum. The anal aperture lies in a long, extended, almost tri- 

 angular pit. The operculum is strongly arched and approximately 

 rectangular. The lingula is scarcely visible, broadening out at the 

 end, and provided with fine teeth. The long bristles which are char- 

 acteristic of the various species of Aleurodidse are entirely wanting 

 in this case. Length approximately 1.7 mm., width about 1.3 mm. 

 I have found adult specimens of this insect at Slafringe in the 

 Province of Ostergotland, Sweden (June 2, 1905). Puparia were 

 very common on the naple leaves of the experimental field near 

 Stockholm (Nov., 1906). 



Aleurochiton forbesii (Ashmead). 



(PI. XXXIII, figs. 1-9.) 



Aleurodes aceris Forbes, 14tli Rept. 111. State Ent., p. 110 (1884) ; Bui. 45, 

 U. S. Nat. Mus., p. 294 (1893). 



ORIGINAL DESCRIPTION. 



I have noticed for several years, a peculiar bark louse upon the leaves of 

 the maple, but have not bred it until the present year. The fully developed 

 pupal scale is oval in general outline, somewhat lyrate, broadest posteriorly, 

 contracted in front of the middle. Margins entire, surface densely granu- 

 lated. The color is chocolate, mottled with white, the white varying in amount 

 and tending to form three transverse bands. The central segmented area is 

 usually irregularly mottled with white, and a quadrate patch, including the 

 vent, is almost always brown ; but, otherwise, the color may vary fi-om nearly 

 uniform brown to almost white. Outline sometimes slightly emarginate 

 posteriorly. Length, .095 of an inch; greatest width, .045; width at anterior 

 fourth, .036. 



The imago is pale yellow throughout; legs and abdomen pale; wings milky 

 white; rostrum black at the extreme tip; veins yellowish; first joint of the 

 anteiUKC scarcely longer than wide, the remaining joints filiform, the second 

 nearly as long as the four following and about four times as long as the first, 

 • the fourth longer than the third, the third and fifth about equal, the sixth 

 fusiform. 



At Tamaroa, in southern Illinois, soft maple trees were found badly infested 

 by this bark louse, but elsewhere it has occurred in only trivial numbers. There 

 are apparently two broods of this species in a year, scales collected in August, 

 1883, emerging April 10 to 24, 1884, and others, collected during the present 



