INSECTS AFFECTING PARK AND WOODLAND TREES 52 I 



to the end of the suranal plate. The underside of the body in front and 

 the middle abdominal legs are brownish. 



Green oak caterpillar 



Nadata gibbosa Abb. & Sm. 



A pale greenish caterpillar about x /t inch long, with a more or less distinct yellowish 

 lateral line, occurs on oaks and various other trees in midsummer. 



This leaf feeder is rather common though rarely abundant. The larva 



is a pale green form not easily separable from several species having similar 



habits. 



Description. The full grown larva has been described by Dr Packard 

 as follows : 



Body green, large ; head very large, full, rounded, high toward the 

 vertex, as wide as the body, deep pea-green ; the labrum whitish green ; 

 mandibles bright yellow, tipped with black, making them very conspicuous. 

 Body glaucous pea-green, thick, full, soft, tapering toward the end, and the 

 surface with minute, raised, flattened more or less confluent granulations. 

 A lateral yellow line formed of yellow, raised, flattened areas. Spiracles 

 deep red. Supra-anal plate conical, flattened, apex much rounded, the edge 

 colored bright yellow. The thoracic and abdominal feet pale pea-green ; 

 all concolorous. Length 33 mm, thickness 6 mm. 



The moth is a light buff color and has a wing spread of a little over 2 



inches. Near the basal third there is a dark brown, slightly curved line 



and an oblique one of the same color at the apical third, which latter is 



margined outwardly by pale yellow. Outer edge of wing with minute 



whitish scallops. 



This species has been recorded on oak, maple, white birch and sugar 

 plum. It has a wide range, extending from Maine and Canada to Oregon 

 and California, southward to the Atlantic and Gulf coasts. 



Io caterpillar 



Automcris io Fabr. 



A large, greenish, stout caterpillar with fascicles of irritating, sharp spines over the 

 body, feeds in late summer on the foliage of a number of trees. 



This caterpillar with its light green body and delicate markings of 



yellowish red, is a beautiful creature. When full grown it is about 2 inches 



