Andricus cooki Melika, Nicholls & Stone, sp. nov.

Diagnosis. Catkin galls of Andricus cooki most closely resemble those of two known species from Florida (C. myrtifoliae (Beutenmueller, 1917) on Q. myrtifolia and C. quercusturnerii (Ashmead, 1881) on Q. nigra) and also Andricus fitzpatricki described herein. In A. cooki the galls are covered with dense whitish pubescence, while in A. fitzpatricki and C. myrtifoliae the clusters of catkin galls are smooth and shiny, without pubescence.

Gall (Fig. 113). Dark green, sometimes purplish, clusters of densely pubescent, rounded unilocular galls on catkins. Clusters contain 10–20 individual galls and appear to cause shortening of the catkin. Similar to or the same as the undescribed gall in Figure 55 of Weld (1959).

Biology. Only a sexual generation is known, which induces galls on catkins on Q. myrtifolia and Q. laurifolia. Adults emerge in late April–May.

Distribution. USA, Florida: Lake Placid; Archbold Biological Station; Lake Manatee State Park; Spanish Ponds Wildlife Reserve, Jacksonville.

Quercus myrtifolia, phellos
Flower galls
Globular, short-pubescent. Fig 55.

[Photo caption]
On Q myrtifolia. Also on Q phellos.