THE LEPIDOPTERIST 23 



In August 1915, I found a fresh female specimen 

 of the palsearctic Colias hyale L. f . nigrofasciata Brams 

 at Allenstein in Germany. This specimen I described 

 and figured in "Entomologische Zeitschrift, Guben, 

 Jahrg, XX, No. Z2 (Colias hyale L. aberr.)." In Sep- 

 tember 1909 I found a Colias philodice with black 

 veins in Forest Hills, Mass. 



In these two cases I have convinced myself that 

 high temperature was the probable cause for the 

 emergence of these nigristic forms, for the German 

 specimen was caught six days after a forest-fire at 

 the edge of the burned area, while the American spec- 

 imen was caught at the foot of a huge stone wall 

 where there were some batches of clover. The re- 

 flection of the sun rays from the stones created such 

 a high temperature that the air was vibrating and it 

 is quite possible that the caterpillar which gave rise 

 to this aberrant specimen pupated close to the stone 

 wall or in one of its crevices. 



Nigristic and melanistic specimens of normally yel- 

 low Colias species are rare and the cases recorded 

 refer mostly to female specimens. There are, un- 

 doubtedly, many interesting discoveries to be made by 

 those who would be willing to experiment with high 

 grades of temperature on Colias chrysalids. 



ANNOUNCEMENT 



We recently have bought jointly with Mr. Samuel 

 E. Cassino of Salem, Mass., the famous collection of 

 Lepidoptera of Mr. Jacob Doll oi Brooklyn, N. Y., 

 being the largest private collection of this type in 

 North America, and having a world-wide reputation 

 for its extremely beautiful condition, its richness in 

 types, cotypes and aberrations. We will break up this 

 collection by species and genera and collectors should 

 write us their wants. A detailed list will be printed 

 shortly. 



New England Entomological Co. 

 366 Arborway, Jatnaica Plain, Mass. 



