. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 114 THE SPRIXG GRAIN-APHIS OR '' GREEN BUG.'' The male refused to mate with an}- more females after the twelfth. Table XIII shows the results of these observations: Table XIII.âOffspring produced as the result of mating one male Aphidius with 12 Female Offspring. Female, cage No.â mated â with male from cage No.â Males. Females. 180 180 29 55 181 180 14 33 182 180 21 30 1S3 180 35 41 184 180 2 8 1S5 180 0 0 186 180 13 30 187 180 39 25 1SS 180 1 0 189 180 50 0 190 180 8 9 191 180 26 16 From these data it
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. 114 THE SPRIXG GRAIN-APHIS OR '' GREEN BUG.'' The male refused to mate with an}- more females after the twelfth. Table XIII shows the results of these observations: Table XIII.âOffspring produced as the result of mating one male Aphidius with 12 Female Offspring. Female, cage No.â mated â with male from cage No.â Males. Females. 180 180 29 55 181 180 14 33 182 180 21 30 1S3 180 35 41 184 180 2 8 1S5 180 0 0 186 180 13 30 187 180 39 25 1SS 180 1 0 189 180 50 0 190 180 8 9 191 180 26 16 From these data it appears that all of the eggs from the last few females were not fertilized, as Mr. Kelly finds that females predom- inate when the eggs are properly fertilized. Table XIV illustrates this latter point. Table XIV.âOffspring of Aphidius produced from eggs properly fertilized. Offspring. Cage No.â Males. Females. 197 39 67 297 15 20 299 13 33 300 24 40 302 20 34 304 16 50 306 47 12 333 115 15 403 26 41 404 3S 93 405 Total .. 26 44 379 429 1 These two females were apparently unfertilized, although they were supposed to have mated, as they give about the same results as some of the unmated females. If these two be eliminated it will be seen that the females are far in excess of the males. PARTHENOGENESIS. In all of the studies of parthenogenesis care was taken to preserve both parents and offspring, the individuals of each family or brood being preserved and kept entirely separate for future systematic studies, which were later carried out by Mr. Yiereck. The first record of parthenogenesis of this species was published in the Proceedings of the Entomological Society' of Washington,1 by the junior author, whose attention was first called to tins phenomenon 1 Proc. Ent. Soc. Wash., vol. 10, Nos. 1-2, September 15, 190S, pp. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appeara
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