CROSSING EUSCHISTUS VARIOLARIUS AND EUSCHISTUS SERVUS. 347 



of the eggs, and she. must have injured others, as only eleven of the group 

 developed. 



Of the remaining 173 eggs deposited by this female 119 hatched. For 

 some reason we were able to rear only a small proportion of these to the 

 winged stage. We succeeded in rearing only 57 (31 ^ & 26 ? ). Thirty 

 of these males were photographed, and are shown on Plate 30. The male of 

 this pair of F^ hybrids died September 16th. The female was killed 

 September 21st, ten days after the last deposition of eggs. 



See photo 14, Plate 28, for the male of this pair. 



Record VI. (p. 366) . Third Fair of Fi Hybrids. — 194 eggs were deposited 

 from July 30th to September 2nd. The pair mated 21 times and eggs were 

 deposited 10 times, and not oftener than once or twice between two matings. 

 Seven of the 194 eggs were killed for cytological study. Of the remaining 

 187 at least 172 hatched — for the number hatched is underestimated, as in 

 two cases we counted only those nymphs that survived the first moult. 



110 of these nymphs were reared to the winged stage (54 ^ & 56 ? ). 

 Forty-eight of the males were photographed and are shown on Plate 31. 

 Six males died just after the fifth moult. Two of these are preserved as 

 pinned specimens^ and four were destroyed because the ventral surface was 

 dark and the bugs were of no value for demonstrating the genital spot. The 

 male of this pair of Fx hybrids was photographed, and is shown on Plate 28^ 

 photo 10. 



Record VII. (p. 367). Fourth Fair of F, Hybrids. — 170 eggs were 

 deposited from August ,8th to September 8tli. The pair mated 10 times, 

 and eggs were deposited 8 times, and not oftener than once or twice between 

 two matings. Seven of the 170 eggs were killed for cytological study, and 

 of the remaining 163 at least 130 hatched. This number is an underestimate, 

 for in three cases we counted only those nymphs that survived the first moult. 

 We succeeded in raising to the winged stage only 63 of the 130 nymphs that 

 hatched (28 c? & 35 ?). Twenty-seven of these males were photographed 

 and are shown on Plate 32, photos 42-48. 



We were forced to kill this pair September 11th, as we had as many 

 nymphs in the laboratory as we could properly care for. See photo 12^ 

 Plate 28, for the male of this Fj^ hybrid pair. 



Record VIII. (p. 368). Fifth Fair of Fi Hybrids.— 110 eggs were 

 deposited from August 8th to September 3rd. The pair mated 10 times and 

 eggs were deposited 6 times, and not oftener than once between two matings. 

 Only 29 of the 110 eggs hatched, and only 16 of these survived to the winged 

 stage (4 (^ & 12 ? ). The four 'males were photographed, and are shown on 

 Plate 28, photos 15 and 16. September 3rd, both male and female of this 



