460 



MISSES K. rOOT AND E. C. STROBELL 



Tables 3 to 10. 

 Lengths o£ the intromittent organs in the Fg hybrids, showing the influence 

 o£ the two original parent species, and a comparison of these lengths with 

 the inheritance of the E. variolarius genital spot. This comparison demon- 

 strates that these two exclusively male characters are not linked in 

 inheritance. 



Table 3.— Fg males from the 1st pair of Fi hybrids. Plate 42. 43 specimens. 



X 20 diams. 

 mm. 



Photos. 

 17 



18 



19 



20 



21 



22 



23 



Genital spot.* 

 1st (upper) bug intermediate. 

 2ud „ ditto. 



3rd „ ditto. 



4th „ J^. servtis. 



5th „ intermediate. 



1st (upper) bug intermediate. 

 2nd „ ditto. 



3rd „ ditto. 



4tli „ ditto. 



5th „ E. servtis. 



Ist (upper) bug intermediate. 

 2nd „ ditto, 



3rd „ -E". servus. 



4th „ ditto. 



1st (upper) bug H, servus. 

 2ud „ ditto. 



3rd „ ditto. 



1st (upper) bug intermediate, 



2nd 



JE 



servus. 



3rd 





ditto. 



4th 





ditto. 



6th „ 





ditto. 



6th „ 





ditto. 



1st (upper) bug 



E 



servus. 



2nd „ 





ditto. 



3rd 





ditto. 



4th 





ditto. 



6th „ 





ditto. 



1st (upper) bug 



E. 



vaiiolarius. 



2nd „ 



E 



. servus. 



3rd 





ditto. 



4th 





ditto. 



Intromittent organ. 



E. variolarius 96 



E. servus 146 ,, 



Intermediate 130 „ 



ditto 136 „ 



E. servus 150 „ 



Intermediate 112i mm. 



ditto 128^ „ 



ditto 122 „ 



ditto 137 „ 



E. servus 148 „ 



Intermediate 114 mm. 



ditto 129 „ 



ditto 139^ „ 



ditto 144 „ 



Intermediate 130 mm. 



ditto 120 „ 



E. variolarius 98 „ 



Intermediate 124 mm. 



E. servus 152 „ 



Intermediate 133 „ 



ditto 122 „ 



ditto 136 „ 



E. variolarius 97 „ 



Intermediate 136 mm. 



E. servus 146 „ 



Intermediate 124 „ 



ditto 128i „ 



ditto 130 ,, 



E. variolarius 98 



Intermediate 120 



E. variolarius . , 104 



Intermediate 122 



mm. 



* The genital segment of these insects is demonstrated in Plates 28-34 of this volume, the 

 number of the photographs being the same for the two papers, thus admitting an accurate 

 comparison of the inheritance of the genital spot and the type of intromittent organ. In 

 classifying the photographs of these hybrids we included under the servus type not only 

 those specimens with no spot whatever, but also those with merely a faint indication of a 

 spot, for the latter was not visible in the living specimens nor in those freshly killed. Such 

 a faint indication of a spot will probably not show in all the prints. 



