254 THE CANADIAN ENTOMOLOGtST. 



Femur not much longer ihan tibia. Tarsus hardly ys shorter than 

 tibia ; distinctly swollen at base. Claw rather stout, curved at its tip 

 like a falcon's beak. Digitules of tarsus apparently wanting (deciduous ?). 

 Digitules of claw large and distinct, extending well beyond tip of claw, 

 stem moderately stout, knob large and oval. A bristle on end of coxa, 

 one on end of femur, and one on end of tibia. (Nappan scales show legs 

 much the same, but femur proportionately longer, tarsus only a little 

 swollen at base ; tarsal digitules well-developed, long, ordinary ; digitules 

 of claw short, not extending to end of claw ; claw stout, nearly straight, 

 not hooked. Maine examples show coxa stout, broader at base than its 

 length, with a hair at its tip ; trochanter with a long hair ; femur longer 

 than tibia, tarsus about yi shorter than tibia ; digitules all filiform.) 



Eggs (Maine specimens) very pale pinkish. 



Ifaif.: The types are from Stittsville, about 20 miles from Ottawa, on 

 Ulnius racemosa, sent by Mr. Fletcher. Other specimens are from 

 Nappan, Nova Scotia, on elm (Fletcher), and Orono, Maine, on elm 

 (Harvey). Prof F. L. Harvey states that it is very abundant at Orono ; 

 he has known it for eight years, and it is increasing. The branches are 

 often almost covered with them. 



The Stittsville examples are affected by a Coccinellid, and by an 

 Encyrtid parasite, perhaps a Chiloneurus. 



The species is quite different from the European Lecatiium ulmi, 

 and is doubtless a native of this country. It illustrates well the extreme 

 difficulty of dealing with the American species of Eulecanium, which have, 

 perhaps, not succeeded in reaching a condition of specific equilibrium 

 since the new developments which doubtless followed the termination of 

 tlie glacial epoch. It will be seen from the above that the characters 

 given are quite variable, unless we are dealing with three species instead 

 of one — a view which I cannot for a moment entertain. While thus con- 

 vinced that all these elm forms are strictly one thing, I have a very lively 

 conviction that L. ribis, Fitch, is difTerent — a conviction which I feel 

 sure would be shared by any one who had seen quantities of both — 

 yet it is difficult to point out the precise nature of the difference, apart 

 from the smaller size of ribis. Two species of Fitch, L. cynosbati and 

 L. carycz, have been redescribed by Signoret, who shows that they have 

 6-jointed antennte like ribis and catiadense. I have not seen authentic 

 examples of either, but the description of Z. caryce. agrees so nearly with 

 our elm species that I place the latter under it as a variety. 



