PINE SAW-FLIES 761 
The two following species also occurred on the white pine : 
83. Lyda sp. 
Larva. — Body green all over, including the head ; the latter small, round, shining 
green, with a slight amber tint ; antennae and mouth-parts and labrum darker. 
Body thickest in the middle, tapering towards the head and tail. The segments 
regularly wrinkled transversely, four wrinkles to a segment ; anal legs three-jointed ; 
basal joint amber-colored, the two others blackish. Thoracic legs greenish, with a 
slight amber tint. Supra-anal plate much as usual. Length, 17 mm . On white pine, 
August 8 to 10, 1883, Brunswick, Me. 
84. Lyda sp. 
Immature larva. — Head and body of a uniform pale horn-brown ; head of the same 
color as the body, finely spotted with pale brown ; antennas pale brown, seven-jointed. 
Caudal, antennaeform appendages pale-brown, three-jointed ; first joint about three 
times as long as the second, the third slightly shorter than the second, darker than 
the rest of the appendage, acute and slender. The segments have no markings, but 
are wrinkled above. Supra-anal plate rounded, edge somewhat thickened. Length, 
15 ram . Allied to the Europeau L. campestris. On P. strobus, October 2. 
85. Lyda sp. 
(Plate x, fig. 6.) 
This larva was found on the pitch-pine at Providence, September 27, 
forming a very slight loose black web around the extremity of the 
branch of a young tree, the web inclosing the stumps of the partially 
eaten leaves. It is nearly related to the European Lyda pratensis. 
The nature of the three-jointed abdominal appendages is curious. 
Are they the homologues of the legs or special structures ? They do 
not seem to be used during actual locomotion as prolegs, but may be 
of use in moving about between the pine needles and in the loose web. 
Larva. — Body rather thick, cylindrical, the segments moderately convex, the sutures 
moderately distinct ; the segments wrinkled, there being four well marked wrinkles 
on top of each segment. The head is narrower than the prothoracic segment, round, 
deep brownish honey-yellow, paler in front and inclosing the two diverging oval 
patches ; a single prominent black eye on each side. Antennae very long and slender, 
seven-jointed. The three pairs of thoracic feet long and slender, much attenuated, 
six-jointed, the terminal joints long and slender. The abdominal segments with not 
the least sign of feet, but transversely wrinkled much as above. The only abdomi- 
nal appendage is one of a very singular nature ; a pair of long slender three-jointed 
lateral appendages arising from the end of the lateral ridge of the body, which is 
situated below the spiracles. The appendages, which are black, with white articu- 
lations, apparently arise from the end of the penultimate segment of the body. They 
curve and project out laterally so that most of their length is seen from above. The 
basal joiut is longer and larger than the others ; the second, as long as the first, is 
thick ; the third a little longer than the second and acute, the point much attenuated. 
On top of the end of the body is a triangular area, the apex ending near the end of 
the broad, rounded, flattened supra-anal plate. Body pale shining brick-red ; abroad 
diffuse red dorsal line ; a lateral line of large red patches, one on each segment ; 
ground color deep salmon or flesh color. Prothorax chitinous, pale shining brick-red ; 
A series of lateral, vertical, lanceolate-oval reddish raised spots between the spira- 
cles. Length, 22 mm . 
