THE CANADIAN ENTOMOLOGIST. 



None of my examples of Christina have any trace of such a spot. 



In Eurytheine the discal spot on underside of secondaries is nearly 

 always double. 



In Christitia it is very rarely so, two specimens only out of fifteen 

 having a very minute brownish dot without any silver alongside of the 

 discal spot. 



Eurytheme is heavily shaded with black scales at the base of both 

 wings above, and also on both sides of the median nervure of secondaries 

 and between it and the sub-median nervure, while in Christina there are 

 generally only a few black scales at the base of each wing just around 

 the thorax, the space between the median nervure and the abdominal 

 margin being yellow. These points of difference may not be sufficient, 

 and it is quite possible that Christina may prove to be a northern form of 

 Eurytheine, though the occurrence of the true type of Eurytheme in this 

 northern district, if a fact, as reported by Mr. Strecker on page 132 of his 

 Avork referred to above, would militate against such a conclusion. How- 

 ever, at present the intergrades are lacking, and I hold that until these are 

 forthcoming, or these two forms are proved by breeding to belong to the 

 same species, we are entitled to regard them as distinct and to retain the 

 name Christ itra. 



I may add that the only other specimen of Colias in the collection 

 made by Dr. Bell last summer, was a single male of Philodice, taken at 

 Fort Carlton, 52' 51' N. 106' 13' W., which, while differing from the 

 general type of that species in having a decidedly broader marginal band, 

 is pronounced by Mr. Henry E^dwards similiar to some specimens of that 

 species from the Rocky Mountains. 



ENTOMOLOGY FOR BEGINNERS. 



SMERINTHUS EX.ECATUS AND MY OPS. 



BY THE EDITOR. 



Among the most beautiful of all the night-flying moths may be placed 

 those belonging to the genus Smerinthus, one of the genera included in 

 the Sphi/igidce, or Sphinx moths, a name derived from a fancied resem- 



