The larvae of this parasite develop in the Malpighian tubules of the insect; at a certain stage they cast their cuticle and make their way into the space - part of the haemocoel - found in the labium. [Please select]
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The urine and salts pass from these vessels through the cells lining the tubules into the latter, and are discharged as described above. [Please select]
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2 illustrates the manner in which the blood is distributed in the glomerulus (_f_), and also to the secreting tubules (_e_). [Please select]
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1-5) begins in early May when a few spermatogonia appear in the seminiferous tubules. [Please select]
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Primary spermatocytes appear in the tubules from mid-May to early June. [Please select]
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By mid-May there are practically no sperm at any place in the tubules. [Please select]
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Secondary spermatocytes are still evident near the periphery of the tubules but they are much less numerous than spermatids. [Please select]
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The germinal epithelium is still semiactive and small groups of primary spermatocytes are present in nearly all of the tubules. [Please select]
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A few spermatozoa and spermatids remain in the seminiferous tubules during hibernation. [Please select]
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The seminiferous tubules of immature males are small, lack lumina, and contain a few large but inactive spermatogonia (Pl.) [Please select]
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Duodenum: the chylific ventricle; also applied to the first section of the digestive tract just behind entrance of malpighian tubules. [Please select]
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