REVISION OF MOTHS OF PRODOXINAE 



55 



means of illustrating this variation, figui'es 106-108 are provided to 

 show the size range of the male genitaUa, as well as to demonstrate 

 the somewhat intermediate proportions of the lectotype. In addi- 

 tion, the measm-ements of 37 male dissections are summarized in 

 table 2. The specimens were selected to represent a coverage of 

 the species known distribution and are arranged in the table according 

 to genitalia length, with the lowest values precedmg. The length 

 was measured as the distance from the distal apex of the saccus to 

 that of the lobes of the tegumen. Although most localities listed in 

 this table are represented by only one example, this alone can be of 

 some meaning if compared to specimens from such localities as Tor- 

 rance Co., New Mexico, which present some idea of size variance 

 within a given population. 



Three observations are immediately suggested by this preliminary 

 examination. Fu-st of all, it will be noticed that the male genitalia 

 exhibit unusual diversity in regard to size. In order to test the 

 homogeneity of the entire sample, the coefficient of variability (C.V.) 

 was calculated and found to be extremely high (18.577). As a means 

 of comparison, the C.V. of other characters, such as wing length, 

 width, and wing ratio (table 3), were found to fall, for the most 

 part, within the normal range of 4 to 6 and never exceeding 7. A 



Table 3. — Measurements of female Tegeticula yuccasella 



