32 



THE VARIATION AND CORRELATIONS OF 

 (2) VERMONT. 



Dr. C. D. Howe kindly sent me two collections from Vermont. Their 

 measurements are given in table 23. The one from New Fane (Sep- 

 tember, 1904) contained 37 females; the one from Essex Junction 

 (September, 1904), 18. 



TABLE 23. Vermont collections. 



(3) MASSACHUSETTS. 



I purchased a collection made near Amherst on ' 'fine soil mixed with 

 clay" in the fall of 1901. The females gave the seriations shown in 

 table 24. 



TABLE 24. Variation curves of the Amherst, Massachusetts, collection. 



Unfortunately, I made the measurements of the posterior femora in 

 millimeter classes. I did not, at the time, appreciate the desirability 

 of finer groupings. Since there are only four classes, when grouped in 

 this way, I have not worked out the constants involving the second and 

 higher moments. The average length of the posterior femora in the 

 above seriation is 10.41. The constants of the other curves are given 

 in table 25. 



TABLE 25. Variation constants of the' Amherst collection. 



Body. 



Mean 1 17.0100.073 



Standard deviation, j 1 . 3000 . 052 

 Coefficient of varia- 

 tion.. 7.64 0.31 



Tegminti. 



Wings. 



7. 701 0.055 

 0.9550.039 



5. 465 -M). 041 

 0.7:-H) J -0.029 



Ovipositor. 



13.8970.060 

 1.0520.042 



12.40 0.51 13.35 0.55 7.57 0.31 



