50 ASSOCIATION OF ECONOMIC ENTOMOLOGISTS. 



by all but a few worms. Only a few could be found upon the 

 cherry tree, and the presumption is that they became scattered upon 

 this. 



Of 13 webs found in the choke-cherry brush which had been cut 

 and spread about the outside of the laboratory to protect the loose 

 sand against the wind. 4 were wholly deserted, while 9 contained from 

 12 to many worms. 



COLOE VARIATION. 



A few notes were made upon the different colors on the worms. 

 My notes are not sufficient, however, for the determination of any 

 laws or modes of variation, and the observations were only made in 

 order to get a better idea of the color variation. A careful study 

 along this line would be a subject by itself, requiring all the ob- 

 server's best effort for a number of weeks. But no doubt some very 

 interesting scientific results would be obtained if a series of observa- 

 tions of this kind were platted and curves made to show general 

 frequency, mode of variation, etc. 



Eighteen worms were examined, and following are the results. In 

 each case the colors are enumerated with a figure in parentheses de- 

 noting the number of worms having that color. I had no standard 

 colors to compare, so that the colors named are probably only approxi- 

 mately correct, which does not invalidate the object here in view. 

 Under the second, third, and fourth divisions the body colors given 

 are the dominant ones, while the " stripes " are narrow lines running 

 longitudinally. The worms examined were from a lot that I had 

 taken to the laboratory at least a day previous, and none had molted 

 during that time. 



Head.— Black (10), brown (4), dark brown (2). light brown (2). 



Body (without stripes. 3). — Black (1). bine-black (1). light slate with darker 

 back and venter ( 1 ) . 



Body (irith stripes. 15). — (I) Dorsad: Lead color (1). black (6). light lead 

 (1). dark lead (2). lead stippled black (1), green slate (3). (II) Laterad : 

 Light lead (3), lead (2), dark lead (2), green slate (5). greenish yellow (1), 

 black (1). stippled black (1). (Ill) Ventrad: Light lead (2), lead (2), dark 

 lead (8). bine-black (1), green slate (2). 



Stripes. — (I) Dorsad: No stripes (7), light (3), cream (6) very faint (2). 

 (II) Laterad: No stripes (1). 2 cream (4), 3 cream (6), 2 faint light (3), 

 1 faint i 2 i . 2 light di. 1 cream (1). 



Feet. — (I) Thoracic: Black (13). dark brown (1). brown (2), light brown (2). 

 (II) Anterior abdominal: Black (7), dark gray (4), gray (1), gray-brown 

 (2). dark green (1). olive green (2), light (1). (Ill) Posterior pair: Black 

 (5). gray il >. dark gray (4), light gray il). gray-brown (3). dark green (1). 

 olive green (2). light (1). 



Tubercles. — (I) The two dorsal rows: Black <7). dark (2), brown (4), dark 

 brown (1). light brown (2). light orange (1), light tl). (II) The two 

 dorso-lateral rows: Black (10), black and orange (2), brown (2), dark brown 

 (2), light brown (2). (Ill) The four lateral rows: Orange (S), light 



