. Occasional papers of the California Academy of Sciences. lines. Thiswould appear to make possible distention of the midg-ut and more supple body movement—the latter a de-cided advantage in gallery life. The apterous condition of adult females, and the same tendency in males ofsome species, is undoubtedly an adaptation for life insilk galleries, as will be fully treated in the section deal-ing with wings. The meso- and metathoracic scuta of females aresimple, large plates, each having a prominent anteri-or acrotergite. The narrow transverse sclerite in themembrane between the anterior margin
. Occasional papers of the California Academy of Sciences. lines. Thiswould appear to make possible distention of the midg-ut and more supple body movement—the latter a de-cided advantage in gallery life. The apterous condition of adult females, and the same tendency in males ofsome species, is undoubtedly an adaptation for life insilk galleries, as will be fully treated in the section deal-ing with wings. The meso- and metathoracic scuta of females aresimple, large plates, each having a prominent anteri-or acrotergite. The narrow transverse sclerite in themembrane between the anterior margin of each andits acrotergite is probably homologous to the fullydeveloped prescutum in alate males. There is no greatdevelopment of phragmata. The posterior margin ofthe metathoracic scutum closely contacts the first 20 OCCASIONAL PAPERS OF THE CALIFORNIA ACADEMY OF SCIENCES, NO. 149 prescutum scutum 2 acrotergite prescutum scutum 3 » I abdominal abdomrnoi acrotergite .^ pleural suture ; epimeron2 ^ \ pleural suture | epimeron3 terga spiracles / \ ,1 2. prealar ^ ^ —i ^^i/ _—^!X^ l i -^ ^ l j - i ^ apophyseal pit \ abdominal preepisternum episternumfurcQSternum \ Sternum 2coxa 3 prescutum pleural sutureacrotergite \ wing base i prescutum pleural suture acrotergite abdominal tergum spiracles
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectscience, bookyear1890
