14 



THE VARIATION AND CORRELATIONS OF 



more than one from the same locality. Furthermore, no one species 

 was represented by an extra large number of specimens. I have also 

 embodied in my data the measurements given by de Saussure (1876-77) 

 as typical of various species. There are about 30 of these. In this way 

 data of the genus as a whole have been procured as nearly representa- 

 tive as possible. 



20 



579 a iJ 15 17 19 21 23 2 5 27 



. 4. Polygons of frequency for interspecific and intruspecific (Gotba, Florida) 



ovipositor lengths. 



By "intraspecific" here, the population of a single restricted area is 

 meant. Since "species" is, in this material, such an indefinite term, 

 "intraspecific" is not very fitting, but with the discussion of section 1 

 in mind its special meaning in this case will be readily understood. 



TABLE 8. Comparison of intraspecific and interspecific variability. 



It is to be noted, in the first place, that the interspecific variation 

 curves (table 79) are of the familiar error type. The mediocre species, 

 like the mediocre individuals of a local collection, are the most common. 

 The extremes are rare. Fig. 4 shows the polygon of ovipositor lengths 

 for the long-winged group of the genus as a whole and also the one for 

 that long-winged portion of the genus which was found at Gotha, 

 Florida, September, 1903. It gives a graphic idea of the relation between 

 the range of variation of a moderately variable local collection and of 



