I 74 NEW YORK STATE MUSEUM 



A Stout, large, greenish insect with greenish veined wings 



Dog day cicada or harvest fly, Tibicen tibicen, p. 237 

 A blackish, red marked bug occurring on box elder, western in range 



Box elder plant bug, Leptocoris trivittatus, p. 239 



Chaitophorus ? aceris Linn 



A yellowish green, brown marked plant louse, with long hairy antennae and reddish 

 eyes, is frequently abundant throughout the greater part of the season on the underside of 

 Norway maple. 



This species is present in Albany and vicinity and yearly causes con- 

 siderable injury. It was exceedingly numerous in 1897, and several large 

 colonies were not uncommon on the under surface of many of the leaves. 

 The pest was abundant and such large amounts of honeydew were excreted 

 that walks under infested trees were usually damp in midsummer. Large 

 sticky masses on the surface of the foliage were not uncommon, and they 

 frequently dried into hard clear beads of considerable size. A great 

 many leaves dropped from the trees, probably due to injury by the plant 

 lice. 



Description and habits. This plant louse is found in clusters usually 

 . along the veins of the leaf, or near its base [pi. 11, fig. 5, 6]. The very 

 young are a pale greenish yellow, with red eyes, and the antennae are 

 about 34 the length of the body. As they increase in size, the antennae 

 become longer and are marked with brown near the tips, and brown mark- 

 ings appear on the dorsum. There is a central brown area on the thorax 

 and anterior abdominal segments, and irregular markings on either side of 

 the median line near the posterior extremity of the body. The honey tubes 

 are short, ornamented with black at the tips. The markings become darker 

 as the insect increases in size, and in some wingless females may be almost 

 black and cover a considerable portion of the dorsum. The winged females 

 are relatively quite rare, and differ from the others only in the possession of 

 organs of flight. 



Natural enemies. This species is fortunately a prey of other insects, 

 which undoubtedly do much in keeping it in check. One of the most active 

 of these is the common two-spotted ladybeetle, Adalia bi punctata 



