. Bulletin - New York State Museum. Science. ELM LEAF BEETLE IN NEW YORK STATE 19 crawl on the foot of a bird and thus be transported from one tree to another. Other insects may also to a certain extent transport them and' some, falling with the leaves, might sue- cessfulh' make their way up another tree; the chances, however, are against the latter method. SECONDARY ATTACKS BY IXSECTS It is well known to students of nature that an enfeebled tree apparently invites attack by certain insects which seem to find. Fig. 1 Tremex columba: a, larva showing the Thalessa larva fastened to its side; b,
. Bulletin - New York State Museum. Science. ELM LEAF BEETLE IN NEW YORK STATE 19 crawl on the foot of a bird and thus be transported from one tree to another. Other insects may also to a certain extent transport them and' some, falling with the leaves, might sue- cessfulh' make their way up another tree; the chances, however, are against the latter method. SECONDARY ATTACKS BY IXSECTS It is well known to students of nature that an enfeebled tree apparently invites attack by certain insects which seem to find. Fig. 1 Tremex columba: a, larva showing the Thalessa larva fastened to its side; b, head of larva; c, pupa of female; d, male pupa; e, adult female; all slightly enlarged. (After Riley, Insect life, v. 1, fig. 39) in the unhealthy tissues conditions peculiarly fitted for their development. The ravages of the elm leaf beetle have encour- aged certain of these pests to a marked degree. One of the most common and injurious is known as the pigeon Tremex, Tremex c o 1 u m b a Linn. This insect is a magnificent four winged fly about 2 inches long, with a wing spread of 2^ inches and a prominent horn at the extremity of the abdomen from which it gets tlie common name of horn tail. It may be recog-. 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; New York State Museum. Albany : New York State Education Dept
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
