ORDER HYMENOPTERA 225 



In the fifth stage the very flat head is honey brown with a 

 a paler vertex. The mouthparts are dark brown. The 

 prothoracic shield is pale brown with darker margins. The 

 other segments are unmarked on the dorsum. On the venter 

 the first three body segments are marked with pale brown. 

 On the first segment the colored area covers most of the 

 ventral surface between the first pair of appendages. The 

 lateral margins of the colored area have a somewhat jagged 

 and irregular outline. The color is deeper in a rounded 

 spot at the center of the posterior margin. The spots on 

 the two following segments are small and nearly round at 

 the center of the segments. The thoracic legs are small, 

 short, conical and very little used. Prolegs are slightly 

 developed on abdominal segments 2 to 8 inclusive. There 

 are no anal prolegs and there is no anal plate. 



In the sixth stage the larva acquires a vertical head cap- 

 sule and becomes rather more rotund in its proportions. 

 The full-fed larvae are from 7.5 to 8 mm. long. After the 

 fifth moult they feed no more but leave the leaves and enter 

 the ground. 



The yellowish pupae is to be found in an elliptical cell in 

 the ground. 



Fenusa curta. According to Dyar there is in the eastern 

 States, a sawfly miner of Oak, Fenusa curta. He found the 

 mines of this species on the upper side of the leaves of the 

 bur oaks, Qercus macrocarpa. The completed mines were 

 5 to 10 by 30 to 15 mm. in extent. 



His description of the fifth stage larva shows it to be like 

 Fenusa varipes in many respects but he states that the 

 thirteenth segment is divided by an incisure, the thoracic 

 feet are black, the prothoracic shield is brownish black, and 

 that there are spots on the venter between the thoracic feet. 

 These ventral spots are probably darker than those of 

 Fenusa varipes which he fails to mention. In the fifth and 

 sixth instars a sub-ventral ridge is apparent. 



