THE CANADIAN ENTOMOLOGIST. 197 



have found joints 3 and 4 to be equal in length, sometimes 3 longer than 

 4, and again 4 would be longer than 3, and in one instance joint 3 was 

 very long, 108 /x ; in this case joint 4 was only 24 /x long. 



Pulvinaria innumerabilis, on Aesculiis octandra, East Las Vegas, 

 N. M., Oct. 14, 1902. 



A NEW SAWFLY. 



BV R. A. COOLKy, AGRICULTURAL COLLEGE, BOZEMAN, MONTANA. 



The Sawfly here described is a common pest on the leaves of various 

 species of Popiilus in Montana, and a Bulletin dealing with its life-history 

 and economic significance is about to t^e published from the Montana 

 Experiment Station. We give here an outline of its life-history, followed 

 by descriptions of the two sexes. 



The adults appear on the foliage in May and continue there for 

 about eight weeks. The female deposits her eggs singly on the very 

 young, tender leaves, and at the same time stings them in such a way as 

 to cause the edge to fold under on the lower surface. The egg is found 

 under the epidermis in the end of the fold nearer the petiole. One edge 

 or both edges may be folded. The larva, at first, feeds in the fold, eating 

 off the surface of the leaf, but later ventures out and eats holes in the 

 leaves, always preserving the fold for a retreat. The cocoon is formed in 

 the fold and drops to the earth with the leaf This leaf, among the 

 others on the ground, forms the hibernating place for the insect. 



In this paper the writer has adopted the form of description used by 

 Mr. C. L. Marlatt in his valuable " Revision of the Nematinje of North 

 America." 



Pontania Bozemani^ n. sp. — Female. — Length 6 mm.; robust] 

 emargination of clypeus a semicircle ; lobes of the clypeus rounded ; 

 longest hairs of the mouth-parts about as long as the distance from lobe 

 to lobe of the clypeus ; lateral furrows of the vertex broad and rather 

 shallow ; ocellar basin distinctly defined ; frontal crest almost absent ; 

 antennai moderately slender, 4 mm. long, with joints 3 and 4 subequal, 

 joint 5 shorter, joints 6, 7, 8 and 9 still shorter and subequal in length; 

 sheath acuminate, hairy below at the apex ; claws cleft for one-third their 

 length. Colours princi])ally resinous-yellow and black ; antenm^, large 

 spot on vertex, thorax above except sides of pronotum, dorsum of first 

 abdominal segment, most of dorsum of second and spot on the next fouf 



