no. 2083. LARVAE OF GENUS DIMORPHOPTERYX— MIDDLETON. 501 



but small; body red; dorsum somewhat darker; feet pallid; head 

 pinkish, slightly darkened dorsally. 



Remarks. — The larvae of this sawfly are, in the summer, green, 

 but with the reddening of the leaf petioles they become reddish. 

 They feed similarly to the chestnut species, the younger larvae 

 eating only the upper epidermis and parenchyma, the more advanced 

 eating holes through the leaves. The prepupa never feeds, but crawls 

 around in search of a suitable place for pupation. The larvae appear 

 about the middle of August and usually enter the ground during 

 early October. The adults emerge during early June of the following 

 year, in rearing cages. 



Material of this species has been collected at Falls Church and 

 Wiehle, Virginia. 



DIMORPHOPTERYX QUERCIVORA Rohwer. 



Host. — Quercus rubra. 



Larva. — The only description available is that made by Mr. S. A. 

 Kohwer in the field, September 9, 1912, at Tomahawk Lake, Wisconsin. 

 Prothoracic proturbances separated basally by their length; body 

 reddish; dark reddish black, dorsal line very faint; head red with, 

 faint indication of small dorsal black spot. 



Remarks. — Very little is known of the larvae of this species. The 

 material was found in advanced stages eating holes through leaves 

 and, becoming prepupae, disappeared into the ground in the latter 

 part of September. The adults emerged in breeding cages late in June 

 of the following year. 



The field observations on this species were made at Tomahawk 

 Lake, Wisconsin, while the rearing was done at Falls Church, Virginia. 



DIMORPHOPTERYX ERRANS Rohwer. 



Host. — Birch and linden (teste Dyar). 



Egg. — Laid in nearly circular saw cuts under the upper epidermis 

 in the middle of the leaf. 1 



Larva. — The I-II, and IV-VII stages of larvae were described by 

 Dyar, 1 but under heading I?, II?, III-VI. See correction, 2 which 

 may not refer to this species, but is sufficient to establish the error in 

 the naming of the stages. 



EXPLANATION OF PLATE 28. 



Dorsal view of living fifth or sixth stage larva and work of Dimorphopteryx casta 

 neae Rohwer. 



i Dyar, Trans. Amer. Ent. Soc, vol. 22, 1895, p. 311. 

 » Journ. N. Y. Ent. Soc, vol. 5, 1897, p. 199. 



