106 THE CANADIAN ENTOMOLOGIST. 



approximate so closely in this respect in individuals that this character 

 fails. 



The above forms can all be very satisfactorily determined where they 

 depart from typical marks, by the observance of the above characters, 

 which may be thus stated : 



Hind tarsi short, joints not longer than wide. 

 Scutellar striae lo7ig. Comma. 

 " short. Pallipes. 



" " Thorax usually finely rugose (Cahfornia). Rugicollis, 



Hind tarsi lo7ig, joints narrow, first one-half longer than second. 

 Scutellar striae short. Three basal joints of antennae glabrous. 



Tachycellus atrimedius. 



This paper is not intended to touch on the question of whether the 

 three first mentioned are species, or at most, varieties. Say did not 

 separate pallipes and comma ; the species now recognized as com?na he 

 describes by the former name, and his variety B is the true pallipes Fab., 

 according to the bibliography. 



The American Entomologist, vol. iii., p. 154, states, as the opinion 

 of Dr. G. H. Horn, that comma and rugicollis are synonymous with 

 pallipes. 



NORTH AMERICAN GEOMETRIC^. 



BY A. R. GROTE. 



I have indicated in this short paper where the types of my Geometrid 

 species are to be found, to the best of my knowledge, and I have given 

 such additional information as I am possessed of with regard to the 

 species. I have followed the classification of Dr. Packard, except in a 

 few instances where I have found reasons to prefer other names. I refer 

 to my paper, Can. Ent., 8, 152, for a review of the synonymy of certain 

 species. Two species, one described by Dr. Harvey (viz., Endropia 

 Warneri), have been re-named by Dr. Packard, who calls Dr. Harvey's 

 species Apiciaria. As to whether we must put the terminations aria and 

 ata (accordingly as the ^ antennse are pectinate or not) I cannot attempt 

 to decide. I think it is advisable to bear this rule in mind when naming 



