The black fly of citrus and other subtropical plants . out-of-doors, and there was generally a considerable breezeblowing through the room. Likewise the light in the room was dulland it seems that all the factors taken together retarded the indi-viduals, especially in the pupal stage. But laboratory data give aclue to the ability of the species to adapt itself to its environmentand likewise indicate what takes place in the dry season, especiallyin a region like Las Sab anas. 24 BULLETIN 885, U. S. DEPARTMENT OF AGRICULTURE. It is seen, therefore, that Ashby (3) is right fundamentally re-gardin
The black fly of citrus and other subtropical plants . out-of-doors, and there was generally a considerable breezeblowing through the room. Likewise the light in the room was dulland it seems that all the factors taken together retarded the indi-viduals, especially in the pupal stage. But laboratory data give aclue to the ability of the species to adapt itself to its environmentand likewise indicate what takes place in the dry season, especiallyin a region like Las Sab anas. 24 BULLETIN 885, U. S. DEPARTMENT OF AGRICULTURE. It is seen, therefore, that Ashby (3) is right fundamentally re-garding the life history of the black fly. But he did not go farenough in his studies. The life history is not clear-cut, as one isled to believe from his brief work, and is greatly influenced by con-ditions. The total length of time from the egg to the adult as givenby him and Cardin (11) may be much longer than they of the individuals do go through their development in as fewas 55 days, but there is a great variation and the majority take a. Fig. 5.—Diagrammatic chart showing method used in keeping record of individuals of Aleurocanthus woglumi in life-history work. longer time, especially under unfavorable conditions. There is con-siderable variation in the length of time that individuals remain ineach instar, the greatest variation being in the time that they remainin the pupal stage. This is true in a colony all of whose individualshatched from the same egg spiral. There seems to be a constantdropping back of some individuals so that the group life history isdrawn out. The time for the complete development from egg to adult, as isshown by the tables, ranges from 55 (45 the minimum) to 113 (themaximum) days. THE BLACK FLY OF VI.—Life history of Aleurocanthus woglumi. GROUP RECORD 2 (1918), INDOOR EXPERIMENT. HOST: LIME. 25 Eggs laid. No. Hatched. No. First Secondmolt. No. Thirdmolt. No. Adults. No. molt. pu- F. Aug. 6» 55 55 Aug. 17Aug. 1
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