Eleventh Report of the State Entomologist 91 



PAQK* 



^ight result from weeks of intermission in spraying, 120. Seventeen 

 species of apple-tree insects named that should he combated during 

 the blossoming period, 121. Before deciding upon the proposed inter- 

 mission, the interests of the apiarist and of the fruit-grower should be 

 carefully weighed,, one against the other, 122. Later experiments by 

 Prof. Webster in testing for arsenic in dead bees, 122. Summary of four 

 experiments', 123. The last two showed arsenic within the abdomen and 

 honey sacs and in dead brood in hives, 123. Conclusion drawn that 

 bees are liable to poisoning from arsenically sprayed blossoms, 123. 



On the Girdling of Elm Twigs by Orgyia leucostigma 124 



Destructiveness of the insect to the foliage of shade and fruit trees for 

 years in Albany, 124. A new form of injury to Ulmus Americana in 

 1883, 124. Tips of twigs girdled and thrown to the ground, 124. Orgyia 

 larvae detected in the girdling, 124. Cause of the breaking off of the 

 tips, 125. Purpose of the larval girdling, 125. The young bark particu- 

 larly attractive to the larvae, 125. Eaten for a brief time, 125. Years 

 of remarkable abundance and comparative scarcity of the Orgyia, 125. 

 A later girdling by a second brood of the larvae in August, 1895, 125. 

 A second brood not previously recorded in Albany, but known in some 

 other cities, 125. Interesting feature of enlarged bulbous growth in 

 girdled twigs immediately above the decorticated portion, 126. Its ex- 

 planation, 126. Girdling not observed in the other food-plants of 

 Oi'gyia, 126. 



EuDioPTis NiTiDALis, the Pickle Caterpillar 126 



Bibliography and Synonymy, 126. Its injuries to melons in South 

 Carolina narrated, 127. Eesemblanceof its larva to that of E. hyalinata, 

 128. Both feed on the Cucurbitaceae, 128. A knowledge of the life- 

 history of each, important, 128. Need of special study of their larvae, 



128. Descriptions of E. nitidalis larva by Prof. Eiley and by Mr. 

 Walsh, 129. Illustration of difi'erent stages of the insect by Prof. Riley, 



129. Descriptions of the larva by correspondents, 130. Flight of the 

 moth, 130. Its description, 130. Duration of larval injuries, 131. 

 Manner of feeding, 131. Pupation, 131. When the moths appear, 131. 

 Importance of knowing when the eggs are deposited, 131. In which of 

 the States its injuries have been severe, 131. Special injuries in Illinois, 

 Michigan, and North Carolina, 131, Its gradual extension of rauge, 131. 

 Seasonal climatic conditions apparently control its multiplication, 132. 

 Of late, prefers muskmelons to cucumbers, and more abuudant in 

 Southern States than in the Western, 132. Its several food-plants, 132. 

 Distribution in Canada, the United States, Central America and South 

 America, 132. A Chalcid parasitic on it, 132. Chauliognathus marginatus 

 believed to prey upon it, 133. Eemedies — spraying with Paiis green or 



