. Bulletin of the Department of Agriculture. Agriculture; Agriculture. MEXICAN" BEAN BEETLE IN THE SOUTHEAST. 11 Table 3.âSummary of life history of the Mexican bean beetle at Birmingham, Ala., 1921 and 1922. [Average days of development.] 1921: 2,019 EGG-TO-ADULT RECORDS. Generation. Incuba- tion period. First Second Third Fourth Pupa- tion period. instar. instar. instar. instar. Days. Days. Days. Days. Days. Days. 10 0 6 4 8 6 6 4 3 3 6 6 6 4 3 3 6 6 6 3 3 4 8 7 Develop- mental period. First Second generation Third generation. Fourth generation Days. 1922: 1,407 EGG-TO
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. MEXICAN" BEAN BEETLE IN THE SOUTHEAST. 11 Table 3.âSummary of life history of the Mexican bean beetle at Birmingham, Ala., 1921 and 1922. [Average days of development.] 1921: 2,019 EGG-TO-ADULT RECORDS. Generation. Incuba- tion period. First Second Third Fourth Pupa- tion period. instar. instar. instar. instar. Days. Days. Days. Days. Days. Days. 10 0 6 4 8 6 6 4 3 3 6 6 6 4 3 3 6 6 6 3 3 4 8 7 Develop- mental period. First Second generation Third generation. Fourth generation Days. 1922: 1,407 EGG-TO-ADULT RECORDS. First Second generation Third generation. Fourth generation 8 5 4 5 8 6 6 4 4 4 S 7 6 4 4 4 8 7 7 0 a 7 10 12 L/EE CyCLE. oi/erw/a/tered BEETLES e/rst generat/oa/ larv^s: E/RST GEA/ERAT/OA/ BEETLES SEGOA/O GENERAT/OA/ LARl/AZ SEGOA/D GEA/ERAT/OA/ BEETLES Th'/RD GEA/ERAT/OA/ LARl/AZ TR/R£> GEA/EBAT/O// BEETLES EO//RT/V GEA/ERAT/OA/ LARIAAZ EOC/RTH GEA/ERAT/OA/ BEETLES BEETLES /A/ A//BERA/AT/OA/ â â s4CT/l/E RE/7/OD âBEETLES s4CT/VB PER/ODâLAA71&E <»⺠Fig. 6.âLife history of the Mexican bean beetle in an open-air insectary and field cages at Birmingham, Ala., during 1921. Based on 2,393 egg-to-adult rearings. SEASONAL LIFE HISTORY. The discussions in this bulletin are based on observations covering only a two-year period in a restricted locality, which is too short a time to draw conclusions on many phases, especially since this study deals with an insect in a new habitat with a constantly increasing distribution. A large series of life-history experiments were performed during the two seasons, 1921 and 1922, and these have been condensed into charts. (Figs. 6, 7.) Figure 6 gives the results of 2,393 egg-to-adult rearings, obtained during the year 1921, chiefly by J. K. Douglass. Figure 7 gives the results of 1,590 egg-to-adult rearings, obtained. Please note that these images are extracted from scanned page images that may ha
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