Vitisiella brevicauda

Ampelomyia viticola

Lasioptera vitis OS

Swelling of the stem and leafstalks of the wild grape. This irregular succulent swelling, which becomes red on its stouter and riper portions, extends not only along the stem and leafstalks, but also invades the leaf-ribs. It contains round hollows of about 0.1 in diameter with an orange-yellow larva in each. Some of the hollows are often abandoned by their inmates and invaded by numerous Thrips. Having brought this gall home, I noticed that the larvae went under ground and obtained the fly on the 29th of June. 



Cecidomyia viticola, n. sp.

Elongated, conical, red galls, 0.25 to 0.3 long; on the upper side of the leaves of the grape. On the 16th of July, when I found them, they contained pale orange larvae, the breast bone of which had two points anteriorly, with several small indentations between them. The tip of the body ended in two curved, horny points, directed upwards. 

Monographs of the Diptera of North America