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; antennje 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™™. 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 ; antenn;© pale brown, seven-jointed. 

 Caudal, antenn.Teform 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, 

 15mm_ Allied to the European L. cavipestris. On P. stroiua, 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 jpratensis. 



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, fiatteued supra-anal plate. Body pale shining brick -red ; a broad 

 diff'use 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™™. 



