195 



Dec. 1897.] Dyar : New Sawflies, and Larv^.. 



ventral region white ; a gentle white bloom ; feet colorless. Segments 

 6-annulate. Joint 2 and the anal flap white. No points on the body 



and no spots. 



Ultimate stage.— ^^^^ pale, pale silvery gray over the vertex- 

 Body neatly 6-annulate, shining, dorsum pale greenish, silver gray end- 

 ina above the tracheal line, brownish on joints 12-13; subventral 

 region and legs pale, waxy greenish. Folds shaded with tarry brown. 

 Spiracles dark. 



Pontania robusta Marlatt. 



No gall, but a portion of the leaf simply folded over. The egg is 

 deposited under the lower epidermis near the edge, not far from the 

 petiole ■ The larva eats little patches of the parenchyma on the under 

 side scattering three-fourths of the way to the apex, apparently wh.le 

 the leaf is young; these patches are slightly swollen, discolored, pale, 

 and as a result the outer fourth of the leaf folds back, neatly touching 

 the surface, forming a hollow in which the larva lives. Finally the 

 larva eats the whole leaf, emerging from its house and eating theapex 

 of the leaf to return to the house again after feeding. The leaf is not 

 rolled at all, simply folded. Fresh eggs were found May 9th. At that 

 time the young leaf was neatly folded back though not fully grown. On 

 expanding the folded part it was seen to be slightly larger than normal, 

 forming a lobe on the leaf. The egg was situated under the lower 

 epidermis, elliptical, white, .4 X. 8 mm. 



Sta-e /.—Head .35 mm. wide; all whitish translucent, the food 

 showing" by transparency. Head shining, body less so, the segments 

 indistinctly 3-annulate; set^ fine, white, apparently a row on each 

 annulet. Anal prongs colorless. Thoracic feet spreading. Length 



i.q mm. , , , 



^/^-^ //.-Head .5 mm., pale brown, eye black, mouth brown. 

 Body slender, colorless, translucent; segments irregularly 3-annulate 

 the first annulet flat, not bulging. Setee whitish, very obscure. Anal 

 segment somewhat swollen, prongs short. Feet on joints 6-11, 13- 



Sta<^e ///—Width of head .7 mm. As in the last stage, ihe 

 apex of "the leaf is not eaten, the larva still feeding on the parenchyma 

 in a patch around the anterior edge of its house. 



Stage /F.-Head i mm. The same. One was observed to 

 emerge at the posterior end of the Kouse near the petiole. 



Stage F— Head very pale brown, dotted, shining, eye narrowly 

 black, jaws large, black, width 1.3 mm. .>T3ody shining, translucent. 



