108 MAINE STATE COLLEGE 



tip like a falcon's beak. Digitules of tarsus apparently wanting 

 (decid.ious?) Digitules of claw large and distinct, extending well 

 beyond tip of claw, stem moderately stout, knot 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 pro- 

 portionately longer, tarsus only a little swollen at base : tarsal 

 digitules ^ell developed, long, ordinary : digitules of claw short, 

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

 hooked. Maine examples show coka stout, broader at base than 

 its length, with a hair at its tip : trochanter with a long hair : femur 

 longer than tibia, tarsus about 1-3 shorter than tibia; digitules all 

 filiform. J 



Eggs. — (Maine specimens) very pale pinkish. 



Hah. — The types are from Stittsville, about 20 miles from 

 Ottawa. Ontario, on Ulinus ricertiosa. sent by Mr. Fletcher. Other 

 specimens are from Xappan, Xova 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 8 years, and it 

 is increasing. Tne branches are often almost covered with them. 



The Stittsville examples are affected by a coccinellid and by an 

 Encyrtid parasite, perhaps a Chilonenras. 



TLe species is quite different from the European Lecanium. vlmi, 

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

 extreiiic iliiLculty of dealing with the American species of Le- 

 canium; which have, perhaps, not succeeded in reaching a condition 

 of specific equilibrium since the new developments, which doubt- 

 less followed the termination of the 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 convinced that all 

 these elm forms are strictly one thing, I have a very lively convic- 

 tion that L.ribis, Fitch, is different — 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 o: the difference, apart 

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

 and i. CarycF have been re-described by Signoret. who shows that 

 they have 6-jointed antennte like ribis and C anoAeiise . I have not 

 seen authentic examples of either, but the description of L. Caryce 

 agrees so nearly with our elm species that I place the latter under 

 it as a varietv."' 



