THE CANADIAN ENTOMOLOGIST. 41 



DESCRIPTIONS OF SAWFLY LARV.^. 



BY CHESTER YOUNG, ELLENVILLE, N. Y. 



Macroxyela ferruginea. — Larva is about 1.5 cm. long and caterpil- 

 lar-like, green with yellowish-white markings, prolegs on every abdominal 

 segment, anal area smooth and concolorous with- the body, antennae six 

 jointed. Feeds on Ulmus americana. 



Head green ; antennas green, except three brown distal joints and a 

 brown ring around the middle of the second and third joints ; mandibles 

 rufous at the tips ; ocelli black. Body green, with the following parts 

 yellowish-white : two dorsal stripes, a substigmatal line extending along 

 the substigmatal fold of skin from the head to about the third or fourth 

 abdominal segment, and the tubercles ; a ventral line of pearly white 

 extending from head to 4th abdominal segment. Segments four annu- 

 lated, with the tubercles on the normal abdominal segments arranged as 

 follows : none on the first anniilation, three on the second annulation, four 

 on the third annulation, and three on the fourth annulation. They are ar- 

 ranged in three general transverse rows. The substigmatal fold of skin with 

 many rudimentary tubercles ; dorsal tubercles with many and lateral ones 

 with itw to no setae; set* very short; two conical projections, with many 

 setas just above the anus. Legs greenish-white, except for basal joint, 

 which is concolorous with the body. 



Cocoon a light shell of sand held together by a few strands of silk. 



Larv^ sit curled around the young leaves or terminal buds with the 

 front part of their body free. They feed by eating a line across the bunch 

 of leaves, thus truncating them all. A single brood each year, the adults 

 appearing in April. A io.'N days before the appearance of the adult the 

 larva which has lain in the larval state in its cocoon until this time 

 changes to an active pupa, which bursts its cocoon and comes forth 

 without shedding its skin and exists then as an active pupa at the 

 surface of the ground from twenty-four to forty-eight hours. It then 

 sheds its skin and becomes the true imago. These breedings have 

 proven the, hitherto considered, distinct species of Macroxyela ferrugitiea 

 and MacroxyelO' infuscata to be identical. The former has consisted of 

 the females, while the latter has consisted of the males. Larvae enter 

 the ground about June ist. 



Pteromis fidvricus. — Young larva jet black and possessing a lateral 

 row of yellow spots ; anal area black. 



Intermediate stage has head black and body green with yellow spots 

 and a dorsal band of black ; venter light with black tubercles ; prolegs 



