WHITE MARKED TUSSOCK MOTH AND ELM LEAF BEETLE 11 



The parent beetle may be recognized by reference to the colored 

 illustration [pi. 2, fig. 5, 6]. It is about ^ inch long, with the head, 

 thorax and margin of the wing covers a reddish yellow. The coal- 

 black eyes and median spot of the same color on the head are promi- 

 nent. The thorax is marked with a dorsal black spot of variable 

 shape and Avith a pair of lateral ovoid ones. The median black line 

 on the wing covers is widely separated from lateral stripes of the 

 same color by greenish yellow. The wing covers are minutely and 

 irregularly punctured, bear a fine pubescence and at the base of each 

 there is an elongated, black spot in the middle of the greenish 

 yellow stripe. These markings are fairly constant in the beetle, 

 though the color is quite variable during life and changes mor^ or 

 less after death. Many of the insects emerging from winter quarters 

 have the yellowish stripes of the wing covers nearly obliterated by 

 black. 



The orange-yellow eggs [pi. 2, fig. i] are usually deposited in 

 irregular rows side by side, forming clusters of from 3 to 26 or more 

 on the underside of the leaf. Each egg is somewhat fusiform, 

 attached vertically by its larger end and with the free extremity 

 tapering to a paler rounded point. 



The recently hatched grub [pi. 2, fig. 2] is about 1/20 inch long 

 with the head, thoracic shield, numerous tubercles, hairs and legs 

 jet-black. The skin is dark yellow but the tubercles are so large and 

 the hairs so prominent that the prevailing color of the grub at this 

 stage is nearly black. An increase in size, following molts, is accom- 

 panied by the stiff hairs becoming less conspicuous and the yellow 

 more prominent, till the grub becomes full grown [pi. 2, fig. 3]. It 

 is then about y^ inch long, more flattened than in the earlier stages, 

 with a broad, yellowish stripe down the middle of the back and with 

 a narrower stripe of the same color on each side, these being sepa- 

 rated by broad, dark bands thickly set with tubercles bearing shorty 

 dark colored hairs. The dorsal yellow stripe is broken on each side 

 by a subdorsal row of black tubercles which /iecrease in size pos- 

 teriorly. The lateral yellow stripe includes a row of prominent 

 tubercles with dark tips bearing hairs of the same color. The under 

 surface is yellowish. 



The pupa [pi. 2, fig. 4] is a bright orange-yellow, about y^ inch 

 long and with a very convex dorsal surface which bears transverse 

 rows of stout, inconspicuous hairs. 



