414 THE CANADIAN ENTOMOLOGIST. 



GEOMETRID NOTES. 



BY RICHARD F. PEARSALT,, BROOKLYN, N. Y. 



The genus Trichodezia, Warren, established in 1895 (Nov. Zool. i r, 

 Part 2, page 119), vvill now contain two of our species. In a former 

 paper (Can. Ent., Vol. 38, p. 38) I stated that Euchoeca alboviitata, 

 Guen., should, as Mr. Warren placed it, be recognized as the type of this 

 genus, and ventured to predict that Euchoeca Califortiiata, Pack., 

 would go with it. Since then, through the kindness of Mr. Beiitenmuller, 

 of the Amer. Museum of Nat. History, N. Y., I have received a male of 

 this species, and find the peculiar generic characters present. These 

 principal characters are the venation of the hind wings and the peculiar 

 brush of upturned hairs upon the under side above the inner margin, and 

 near the base of the j)rimaries in the male. In an arrangement of the 

 genera, it will, find a natural position somewhat remote from Euchivca. 

 Many other genera contain material as widely variant, Orthofido7iia^ with 

 exornata. Pack., as its type, is an instance, for sejuiclaraia, Walk., and 

 vestaliata^ Guen., which Dr. Hulst places under it, while closely related 

 to each other, are not congeneric with exoniata. 



Mr. Edward Meyrick, in his " Classification of the Geometrina of the 

 European fauna, 1892," was closely followed and frequently quoted by 

 Dr. Hulst in 1896. Mr. Meyrick says: ^' The constant and uniform 

 anastomosis of veins 9, 10 and 11 of fore wings also affords a very 



distinctive feature, equally absolute, it has the effect of 



producing a constant auxiliary cell," which he terms the areole. While 

 this may be true of the European Geometridse, our species seem less stable 

 in their structure. In treating some time ago of the genus Nyctobia, Hist. 

 (Can. Ent., Vol. 36, p. 210), I pointed out the variation in number of 

 accessory cells in the wing of N. limitaria. Walk., and the inconsistency 

 prevails, it seems, in other members of the Lobophora group. My 

 attention was called to this fact by Mr. J. A. Grossbeck, who in an 

 endeavour to identify some material, with specimens of Philopsia nivigerata 

 ^canavestita, Pears., in the Hulst collection, found the cells variable in 



December, 1906 



