Abstract
Seasonal variation in the thyroid and interrenal glands of the lizard Leiolopisma rhomboidalis was noted over a period of 12 months. Material was collected in the tropical region of north-eastern Australia. Least seasonal variation was noted in the thyroid and interrenal glands of the nongravid females. Gravid females exhibited greater variation than nongravid females and less than the males in both endocrine organs studied. The cold season (May–August) was the period of least activity of both thyroid and interrenal glands. Greatest thyroid activity in the males occurred during the hot, dry season (September–December). Greatest interrenal activity of the males occurred during the hot, wet season (January–April). Thyroid activity seems related to reproductive activity-yolk maintenance in the females, and copulation and territory defense in the males. Interrenal activity also, to a lesser degree, appears related to reproduction in this lizard. Without experimental work it is impossible at present to establish more positive interrelationships between thyroid and interrenal gland activity.
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