Seasonal Variations in Fat Content and Size of the Southern Pine Beetle1 in East Texas

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Abstract
Average fat content and pronotal width of newly emerged adults of Dendroctonus frontalis Zimmerman varied with season in east Texas. Fat content of beetles emerging during the spring and fall was greater than that of beetles emerging during the summer and winter. Beetles were smallest during the months of July, August and September. Females, in general, were larger and had higher fat contents than males, regardless of season. Implications in relation to bark beetle dispersal and seasonal behavior are discussed.

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