ALEUROCHITON FORBESII. 89 



summer, emerging August 4. From these larvae several hymenopterous parasites 

 belonging to the genus Eluptus escaped September 6, the species of which is ap- 

 parently new. 



ElapiiiJi alcurodis, n. s. Plate XI, fig. 6. Female. Length .03 of an inch ; the 

 head .OOf) inch; front wings .032 of an inch long and .(K>1 inch wide; posterior 

 wings .0032 inch wide at the widest iK)int; iinteinue a.s 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; re- 

 maining joints densely pilose; the club not jointed, as long as the three joints 

 preceding; first joint obconic, second iibout tlie same length but narrower. Color 

 black, surface shining, abdomen alutaceous, head and thorax punctured, antennae 

 yellow, legs entirely yellow, femora and tibite of the middle and posterior legs 

 black, their tarsi yellow. 



Described from three specimens bred from Aleurodes aceris. 



In 1803, Dr. W. H. Ashmead pointed out (Bui. 45, U. S. Nat. Mus., 

 p. 294) that Forbes's name was preoccupied by aceris Geoffroy, a 

 European species, and proposed for this species the name forhesii. 



In his excellent paper "■' Uber einige Art en der Familia Aleurodidse " 

 (Arkiv fur Zoologi, Bd. 3, No. 26, p. 15, 1907), Dr. Tullgren has 

 shown that the European species {aceris GeofFroy) really represents 

 a new genus, for which he proposed the name Aleurochiton. The 

 general similarit}'^ of the pupa case of forhesii to that of aceris sug- 

 gested that the two forms were closely related if not identical, which 

 supposition Avas the more strengthened for the reason that they have 

 similar food plants. Although forhesii is fairly common on maple 

 in the eastern United States, it is only recently that we have had 

 opportunity to examine the adults of this insect. During the summer 

 of 1910, Dr. C. W. Hooker secured the adults in some numbers at 

 Cranmoor, "Wis., and also the following season, at Vienna, Va. Our 

 species proves to belong to Aleurochiton^ but appears to be distinct 

 from aceris Geoffroy, as will be seen from the description which fol- 

 lows: 



Aleurochiton forhesii is fairly conunon on Acer,ruhrum, A. sac- 

 charinitm, and A. dasycarpum, ranging from Georgia to New York, 

 north into Canada and west to Wisconsin, Illinois, and Missouri. So 

 far as we are aware the insect has never been so abundant as to cause 

 injury to its host plants. The European member of the genus, how- 

 ever, has recently attracted attention by its injuries as shown by Mr. 

 Max AVolf in a lengthy article " Ein Beitrag zur Kentniss von 

 Alevrochition acens Geoffroy," etc.. in " Centrallblatt fur Bakter, 

 Parasiten Kunde. U. Infektions Krankheitcn, Bd. 20, April, Zweite 

 Abteilung, 1910, page 643. 



DESCRIPTIVE REMARKS. 



Egg. — Length about 0.24 mm. exclusive of stalk. Fusiform in 

 shape, not quite one-third as wide as long; stalk about one-fourth 

 length of egg. Color white, without markings, though the globu- 



