iOO 



MISSES K. FOOT AND F. 0. STROBELL 



Plate 42. 



{Cf. Plate 29 of this volume.) 



The intromittent organs from 43 Fa males from the first pair of Fi hybrids. 



The male parent of these hybrids is shown in photo 9, plate 28, hut we did 



not succeed in preserving its intromittent organ (see photo 9). 



Photo 17. Intromittent organs from the five F. hybrids of photo 17, plate 29. Lengths 



of intromittent organs: — 1st (upper), 96 mm. 2nd, 146 mm. 3rd, 130 mm. 



4th, 136 mm. 5th, 150 mm. 

 Photo 18. Intromittent organs from the five ¥•, hybrids of photo 18, plate 29. Lengths of 



intromittent organs:— 1st (upper), 112i mm. 2nd, 128 mm. 3rd, 122 mm. 



4th, 137 mm. 5th, 148 mm. 

 Pf[Oto 19. Intromittent organs of the four Fo hybrids of photo 19, plate 29. Lengths of 



intromittent organs:— 1st (upper), 114 mm. 2ud, 129 mm. 3rd, 139i mm. 



4th, 144 mm. 

 Photo 20. Intromittent organs of the three F2 hybrids of photo 20, plate 29. Lengths of 



intromittent organs : — 1st (upper), 130 mm. 2nd, 120 mm. Srd, 98 mm. 

 Photo 21. Intromittent organs of the six F^ hybrids of photo 21, plate 29. Lengths 



of intromittent organs : — 1st (upper), 124 mm. 2nd, 152 mm. 3rd, 133 mm. 



4th, 122 mm. 5th, 136 mm. 0th, 97 mm. 

 Photo 22. Intromittent organs of the five F2 hybrids of photo 22, plate 29. Lengths of 



intromittent organs:— 1st (upper), 136 ram. 2nd, 146 mm. Srd, 124 mm. 



4th, 128A mm. 5th, 130 mm. 

 Photo 23. Intromittent organs of the four Fg hybrids of photo 23, plate 29. Lengths of 



intromittent organs : — 1st (upper), 98 mm. 2nd, 120 mm. Srd, 104 mm. 



4th, 122 mm. 

 Photo 24. lutromitteiit organs of the three F.^ hybrids of photo 24, plate 29. Lengths 



of intromittent organs : —1st (upper), 100 mm. 2nd, 114 mm. Srd, 132^ mm. 

 Photo 25. Intromittent organs of the eight F^ hybrids of photo 25, plate 29. Lengths of 



intromittent organs: — 1st (upper), 114| mm. 2nd, 123 mm. 3rd, 100 mm. 



4th. 108 mm. 5th, 93 mm. 6th, 132 mm. 7th, 85^ mm. 8th, 140 mm. 



Platk 43. 

 ( Cf. Plate 30 of this volume.) 

 Intromittent organs from 30 F, males, from the second pair of Fj hybrids. 

 The male parent of these hybrids is shown in photo 14, plate 28, and its intro- 

 mittent organ in photo 14, Plate 41. 



Photo 26. Intromittent organs from the five bugs of photo 26, plate 30. Lengths of 



intromittent organs: — 1st (upper), 115^ mm. 2nd, 100 mm. Srd, 116 mm, 



4th, 118 mm. 5th, 118 mm. 

 Photo 27. Intromittent organs from the four bugs of photo 27, plate 30. Lengths of 



intromittent organs : — 1st (upper), 99 mm. (this includes 3 mm. for the 



extreme distal end that was broken off in dissection and not preserved). 2nd, 



130 mm. Srd, 130 mm. 4th, iSO mm. 

 Ppioto 28. Intromittent organs from the six bugs of photo 28, plate 30. Lengths of 



intromittent organs :— 1st (upper), 90 mm. 2nd, 142 mm. Srd, 124 mm. 



4th, 131 mm. 5th, 121 mm. 6th, 127^ mm. 

 Photo 29. Intromittent organs from the five bugs of photo 29, plate SO. Lengths of 



intromittent organs :— 1st (upper), 124 mm. 2nd, 123 mm. Srd, 125 mm. 



4th, 126 mm. 5th, 126 mm. 



