. Bulletin - New York State Museum. Science. THE ELM-LEAF BEETLE IN NEW YOEK STATE 19 columba 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, hence the common name of horn-tail. It may be recognized by its cylindrical dark brown abdomen with yellow markings as represented in figure Fig. 5. Tremex columba : a, larva showing the Thalessa larva fastened to its side ; 6, head of larva; c, pupa of female; d, male pupa; e, adult female — all slightly enlarged The female deposits her egg
. Bulletin - New York State Museum. Science. THE ELM-LEAF BEETLE IN NEW YOEK STATE 19 columba 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, hence the common name of horn-tail. It may be recognized by its cylindrical dark brown abdomen with yellow markings as represented in figure Fig. 5. Tremex columba : a, larva showing the Thalessa larva fastened to its side ; 6, head of larva; c, pupa of female; d, male pupa; e, adult female — all slightly enlarged The female deposits her eggs in the trunks of sickly trees, where its larvae run large cylindrical burrows. Many elms in both Albany and Troy show numerous holes caused by this insect. This borer has a deadly parasite in the lunate long sting, Thalessa lunator Fabr, This beneficial insect is of great aid in keeping the Tremex under control. In the trunk of one smal) elm I found the remains of 13 ovipositors. In their efforts to reach the numerous borers in the tree, the females had driven their long ovipositors so far into the wood that they were unable to withdraw them. Another insect which infests debilitated elms is known as the elm borer, Saperda tridentata Olivier, The larvae of this beetle run their burrows under the bark and in the sap wood of the. 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
