. Annual report of the Trustees of the State Museum of Natural History for the year ... Science; Museums. Report of the State Entomologtst. 181 Its Abundance at Lake Pleasant, N. Y. During July and. August last they were observed in large numbers at Sageville (Lake Pleasant), Hamilton county, N. Y. To many of the trees they imparted a peculiar nodose appearance, in instances where they abounded to such an extent that at least three-fourths of the leaves of the tips of the season's growth bore the galL At this time each contained its larva, which but partially filled the gall, yet appearing as
. Annual report of the Trustees of the State Museum of Natural History for the year ... Science; Museums. Report of the State Entomologtst. 181 Its Abundance at Lake Pleasant, N. Y. During July and. August last they were observed in large numbers at Sageville (Lake Pleasant), Hamilton county, N. Y. To many of the trees they imparted a peculiar nodose appearance, in instances where they abounded to such an extent that at least three-fourths of the leaves of the tips of the season's growth bore the galL At this time each contained its larva, which but partially filled the gall, yet appearing as if it had nearly attained its growth. The larvae, when exposed io examination, were inactive, hardly showing any motionj and giving no evidence of a disposition to feed. The Gall Described. The gall consists of an oval enlargement of the leaf near its base, varying in posi- tion from entirely basal (rarely) to one-fifth of an inch removed (also rarely); the aver- age distance does not exceed of an inch. The aver- age length of the ' gall may be some- what above one- eighth of an inch, with a diameter two-thirds as great, which sel- dom exceeds twice the width of the leaf. Its elevation above the sui-face of the leaf is about equal on the two sides, although sometimes seem- ing more dej)ress- ed superiorly from the bending of the leaf by its deformation forming a concavity above. The exterior of the gall is smooth, except as showing some trifling irregularities of Fig. 28. —Balsam tip with galls of Cbcidomyia balsamicola: a, leaf enlarged with gall seen on upper side; 6, the same with gall from lower side, with opening for escape of the larva; c, leaf from which the larva has escaped through opening on upper Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York State Museum of Natura
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