422 FIFTH REPORT OF THE ENTOMOLOGICAL COMMISSION, 



It resembles Li/gus invitus Say, and presents several of the color varieties common 

 to that species, but it is a much larger insect, of a longer figure, and has a more flat- 

 tened upper surface. 



63. Aleurodes aceris Forbes. 



Order Hemiptera ; family Aleurodid^. 



The following account of this interesting insect is copied from Pro- 

 fessor Forbes (Third Eeport Insects of Illinois) : 



Pupa. — 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 granulated. The color is choc- 

 olate, 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 other- 

 wise the color may vary from nearly uniform brown to almost white. Outline some- 

 times slightly emarginate posteriorly. Length, .095 of an inch ; greatest width, 

 .045; width at anterior fourth, .036. 



Imago. — Pale yellow throughout; legs and abdomen paler; wings milky white; 

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

 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 summer, 

 emerging August 4. From these larvie several hymenopterous parasites belonging 

 to the genus Elapliis escaped September 6, the species of which is apparently new.* 



64. Phytoptus quadripes Shimer. 

 Class Arachnida ; order Acarixa. 



Mr. H. Garman gives the following account of this mite, which is 

 taken from his article in Forbes' First Eeport on the Injurious Insects 

 of Illinois: 



This mite produces galls on the leaves of the soft maple, Acer dasycarpum Ehrh. 



This is the Phytoptus upon which Dr. Henry Shimer founded his genus Vasates. 

 It is a coarsely striate species, the striae numbering from 37 to 42. The length is 

 about .008 inch. The tarsal claw is slightly curved and ends in an evident knob. 

 The feather-like appendage has four pairs of prongs. The color varies from pale yel- 

 lowish to light orange. Sexually mature females, the young, and eggs occur in the 

 galls in June. 



• *Elaptus aleurodis Forbes.— Female : Length, .03 inch ; that of the head, .005 inch ; 

 front wings, .032 inch long and .001 inch wide ; posterior wings, .0032 inch wide at 

 the widest point; antennte as long as the head and whole body ; scape stout, arcuate, 

 rising to the top of the head, about as long as the three following joints, nearly 

 smooth, as is also the second joint; remaining joints densely pilose; the club not 

 jointed, as long as the three joints preceding; first joint obconic, second about the 

 same length, but narrower. Color black, surface shining, abdomen alutaceous, head 

 and thorax punctured, antennae yellow, legs entirely yellow, femora and tibiie of the 

 middle and posterior legs black, their tarsi yellow. Described from three specimens 

 bred from Aleurodes aceris. (Forbes.) 



