THE CANADIAN ENTOMOLOGIST 31 



Further on it is stated that "corn husks and the chaff of grain 

 were heavier this season than common, and weed seeds are ob- 

 tained in heavier coverings than are usually noticed. Larvae 

 of insects are deeper in the earth. Field mice and other burrow- 

 ing animals are going deeper, and bark of new wood is much 

 thicker, and weeds are thicker where roots will need protection. 

 All these indicate severe freezing." 



The prophet does not tell us what caterpillar he found, but 

 if he had met with a banded larva of the Milkweed Butterfly 

 (Danaida plexippus), he might have foretold the whole year of 

 uniform variations during each month, as shown by the stripes 

 on each segment. This is the first time that predictions have been 

 based, so far as we know, upon the markings of caterpillars. 



C. J.S. B. 



BOOK REVIEW. 



The Genitalia of the British Geometrid.^. By F. N. Pierce, 

 F.E.S., The Elms, Dingle, Liverpool, Eng., 1914. Clothbound, 

 price 10/-. 



This is a companion volume to the work on the "Genitalia of 

 the British Noctuidae" published by Mr. Pierce in 1909 and it is 

 gratifying to learn that the reception accorded it was so 

 encouraging that not only is the volume on the Geometers before 

 us, but the author promises that an account of the Genitalia of 

 the Tortricidae will follow at an early date. 



The superficial resemblances that exist between many species 

 of the Geometridae of Europe and those of North America and 

 especially of Canada have led to endless muddles in our lists, some 

 collectors and authors considering them identical while others are 

 equally certain that they are not. Having now such excellent 

 drawings and descriptions of these structural details of practically 

 every one of the British species, made not -from one slide of each 

 but from five or six up to over twenty specimens, and checked and 

 rechecked by the author and his friend, the Rev. C. R. N. Burrows, 

 F.E.S., we should be able to determine whether in our related 

 N.A. species these structures show positively that they are distinct 

 or that they are the same species. 



