ELM-LEAF BEETLES. 237 



The beetle. — (Fig. 81 c, natural size ; k, maguified). Resembles somewhat iu appear- 

 ance the well-known striped cucumber-beetle {Diabrotica vittata), but is at once dis- 

 tinguished by the elytra not being striate punctate, but simply rugose, the sculpture 

 under a high magnifying power being represented in Fig. till. The color of the upper 

 side is pale yellow or yellowish-brown, with the following parts black : on the head a 

 frontal (often wanting) and a vertical spot ; three spots on the thorax ; on the elytra a 

 narrow stripe along the suture, a short, often indistinct scntellar stria each side, and a 

 wider humeral stripe not reaching the tip. Under side black, pro- and meso-sternnm 

 and legs yellow ; femora with a black apical spot. Upper and under side covered with 

 very fine, short, silky hairs. In newly-hatched individuals the black markings have 

 a greenish tint; the humeral stripe varies in extent. (Riley). 



18. The elm galeruca. 



Galeruca calmariensis (Linnasus). 



Order Coleottera ; Family Chrysomelidj<;. 



Thick, cylindrical, blackish, six-footed grubs, often 

 wholly defoliating the trees, and changing into an ob- 

 long oval beetle a quarter of an inch long, of a grayish 

 yellow color, with three small black spots on the pro- 

 thorax, a broad black stripe on the outer edge of its wing- 

 covers, and a small oblong spot near their base. (Fitch.) 



This insect has been observed by Riley to be 

 extremely abundant on the elm at Washington, 

 D. 0. I have observed it commonly at Bruns- 

 wick, Me. Fig. S2.— Galeruca calmarietisis. 



Smith del. 



19. Haltica (Graptodera) chalybea (Uliger). 

 Order Coleopteka ; Family Chrysomelid^e. 



Occasionally eating holes in the leaves ; a steel-blue Ilea beetle, varying much in 

 color ; the body oblong, oval, and the hinder part of the thorax marked with a trans- 

 verse furrow ; a little over .15 inch (4™™) iu length. 



20. The ladder chrysomela. 



Chrysomela scalaris (Le Coute). 



Order Coleoptera ; Family Chbysomelid^. 



Feeding on the leaves throughout the season, a shining, hemispherical, bottle-green 

 beetle, with silvery-white wing-covers, on which are several bottle-green spots, and 

 a broad jagged stripe on their suture; its wings rose-red and its antenna} and legs 

 rusty yellow. Length, 0.30 to 0.40. More common on willows, and especially the 

 alder. The larva is thick and fleshy, with a row of black spiracles along the side of 

 the body and a dark prothoracic shield. 



21. The American cimbex saw-fly. 



Cimbex americana (Leach). 



Order Hymenopteka; Family Tenthredinid^. 



A cylindrical, glaucous, yellowish-white worm, coiled and marked like a snail's 

 shell, having a broad black line along the back ; when disturbed ejecting a watery 

 fluid from pores situated above the spiracles ; transforming into the largest species of 

 saw-fly we have, with stoutly-knobbed antennje ; appearing early in summer; also 

 feeds on the birch, linden, and willow. (See willow insects.) 



