500 PROCEEDINGS OF THE XATIOXAL MUSEUM, vol.48. 



eating holes through the leaves. 1 They appear in the latter part of 

 July and disappear in the latter part of September. The larvae 

 average about 5 days a moult, the last feeding stage being the longer. 

 Upon becoming prepupae the lar\ ae cease to feed, but crawl about, 

 seeking a favorable hibernating place. The adults emerge in earlv 

 summer the following year, May 30 to about June 10, in the rearing 

 cages. 



Material of this species from the following localities has been studied : 

 Falls Church and Wiehle, Virginia; and Blythedale, Maryland. 



DIMORPHOPTERYX AUTTJMNALIS Rohwer. 



Host. — Quercus rubra. 



Larva. — Younger stages are characterized from shed skins; the 

 more advanced stages from one larva with additions from another. 

 Stage I. — Head, 0.S75 mm. high by 0.5 mm. broad. 

 Stage II. — Head, 1 mm. high by 0.67 mm. broad. 



..-.Lateral v^ 5p«ne S . Sta £ e HI. — Head, 1,33 mm. 



'^Subd^ Pair 6fx.it>. hi S h by 0.S75 mm. broad. 



Stage IT. — Head, 1.67 mm. 

 high by 1.13 mm. broad. 



, Sub-anal Protuberance. Sta g e V.— Length, 11.5 mm.; 



prothoracic width 2 mm.; head 2 

 mm. high by 1.5 mm. broad: pro- 

 thoracic protuberances promi- 

 nent, higher than thick b as ally; 

 mesothoracic protuberance low 

 fig. 4.— dorsal yiev of AEiLircEE of apical and rounded; subanal pairprotu- 

 sBcmKH of dlmobphoftfetx automkaub. berances sharply pointed, high as 



basal width, approximate emargination between V-shaped; anal spines 

 long and sharp, -A times as long as basal width; head uniformly rufo- 

 ferruginous; dorsum, dark bluish green, sharply separated from paler 

 pleural region and sternum but not with black lines; tip of meso- 

 thoracic protuberance, anal spines, subanal protuberances and basal 

 area of anal plate black, being the only black portions on larva; 

 legs testaceous. 



Stage VI. — Head, 2.5 mm. high by 2 mm. broad: anal spines 

 subequal in length: body red, dorsum darker and with a pair of 

 darker red subdorsal lines: prothorax and protuberances pale red; 

 anterior annulation of mesothorax and its protuberance black: 

 small tubercles on pleural fold, white; anal spines black. 



Stage YH. — (Prepupa). Length (alcoholic specimen), 7 mm.; 

 head, 2.5 mm. high by 2.25 man. broad: apical armature of anal 

 plate reduced to four rounded humps; subanal protuberances present 



i Similar \rork is often caused by the feeding of nymphs of long horn grasshoppers of the genas Scudderii 

 (determined Caudell). 



