TENTHREDINID^ . 



22: 



with a short black stripe on each side of the thorax. The 

 larvje are about half an inch long, of a pale dirty green, yel- 

 lowish beneath, striped with green, and when full-fed yellowish 

 all over. They are social, and may often be found in consider- 

 able numbers on a single needle of the pitch-pine. The larvte 

 spin tough cocoons 

 among the leaves, 

 and the flies appear 

 during August, but 

 probably in greater 

 numbers in the 

 spring. 



These slugs can 

 be best destroj^ed 

 by showering them 

 with a solution of 

 carbolic acid, pe- 

 troleum, whale oil Fig. 153. 

 soap, or tobacco water. Mr. Fish has sent me the larvae of a 

 saw-fly, allied to L. abietis, which, in Eastham, Mass., ravaged 

 the young pitch-pines planted in the sandy soil of that region.* 

 The eggs are laid singly in the side of a needle of the pine ; 

 though sometimes an egg is inserted on each side of the 

 leaf. 



Mr. Riley has described the habits of the White-pine saw-fly. 



of an inch in length -when fully gro^-n; rlarkest above, and with indistinct black- 

 ish spots upon the sides. The head is white with a small black dot uijon each side. 

 " Specimens wei'e taken upon the leaves July -tth. Wentinto the ground about 

 the 20th of July. The cocoon is formed near the surface of the ground of a little 

 earth or sand drawn together. Four specimens came forth about August 32d, all 

 seeming very small for so large larvre." 



*0n sending specimens of the male and female to Mr. Norton he writes that 

 this is an undescribed species, of which he has prepared the following description ; 



^'- Lophyrus pird-rigidce Norton. New Species. Female. Length, 0.30; expanse 

 of wings, 0.0,5 of an inch ; antenna seventeen-jointed, short, brown ; color, luteous 

 brown, with a black hue joining the ocelli, a black stripe down each of the three lobes 

 of the thorax above, and the sutures behind; body paler beneath ; the trochanters 

 and base of the tibia; waxen ; claws with an inner tooth near the middle ; wings 

 very shglitly clouded; cross nervurc of the lanceolate cell straight. Male. Length, 

 0,2,''); expanse of wings, Q.^a of an inch; antennie fifteen-jointed, black, quite short, 

 with twelve branches on each side, those at the base nearly as long as the sixth 

 and seventh ; apical joint simple, enlarged at base ; color of insect black, Avith the 

 abdomen at apex and beneath yellow-brown ; legs the same color at base ; below 

 the knees whitish, 



15 



