32 
the Laggan form may be distinct, and I have seen what looks to me 
like the Calgary species (two specimens only taken) at the coast as 
caesiata.” I do not think I have yet sent European cciesiata to my 
valued correspondent the Rev. G. W. Taylor, nor can I find that I 
have had any correspondence with him on the species. I sent it to 
the other chief student of Geometridae across the Atlantic, Mr. R. F. 
Pearsall of Brooklyn, and he wrote me: “ Your caesiata I have not 
critically compared as yet, but it looks just like specimens I take in 
the Catskill Mountains. I have seen another series taken in White 
Mountains near Hampshire, with the yellow markings of caesiata a 
bright golden, and heavier. Does this correspond to your species 
flavicinctata ! ” {in litt., December 26th, 1905). Later (January 14th, 
1906), he added : “ I think I wrote you that your caesiata and ours 
are the same.” The matter has not yet proceeded further. 
The British Museum only possesses one American example, and 
this is in very bad condition. It was sent by Mr. Cockerell from 
Colorado, as “ caesiata, f. minor,” and looks, as far as can be made out, 
a true caesiata, though—like the Laggan species, and Packard’s figure 
—it seems to have the discal dot of the hindwing obsolescent. 
A photograph of Hulst’s type of Philereme multivagata ( Bull . 
Brookl. Ent. Soc., iv., p. 26, 1881), very kindly sent me by Mr. Taylor, 
also looks extremely like a large specimen' of Entephria caesiata, only 
with a dark margin to the hindwing.; ,>yet it is difficult to see how 
Dr. Hulst could, in this case, have placed it in the genus Pldlereme 
( Scotosia ).* 
On the whole, it seems best to conclude that the true caesiata, or 
something extremely near it, does occur in several parts of North 
America, but that another species is mixed up with it—perhaps more 
than one—and awaiting further study and differentiation. The 
present would not be a suitable place for naming the ravaria- like 
Laggan species, which, on my assumption of its distinctness, has 
really no place in a paper on the variation of Entephria caesiata. My 
task for this evening is therefore accomplished, although you will see 
that there is still need for further sorting-out of the numerous cognate 
forms in this interesting group. 
* Since writing this paper I have received a fine specimen of multivagata, and 
find it is a true Entephria, closely related to caesiata, but distinct. 
