324 ECONOMIC ENTOMOLOGY 



and eyes reddish black; legs yellow; under side of body reddish-yellow, 

 variegated with brown. Thorax black with two yellow spots on each 

 side; wing-covers black with yellow tips, a yellow spot on each shoulder, 

 a yellow curved band, a zigzag yellow band forming the letter W, 

 a median yellow band arching backward, and a black curved band 

 and spot on the yellow tip. June-July. 



Eggs. — Deposited in summer in slits in the bark of larger limbs. 



LarvcB. — Whitish, flattened legless grubs with brownish mouth- 

 parts, excavating shallow burrows, often several feet long, in inner 

 bark and sapwood, and often girdling the tree. When full grown 

 about 2 inches long. 



Pupa. — Formed in the end of the burrow. 



Control. — Examine trees for "sawdust" and probe the burrows 

 to kill the grubs. 



Oak Twig Primer {Elaphidion villosum Fab.). Adult. — A slender, 

 dark brown beetle, ^g inch long, sparsely covered with whitish hairs; 

 tips of wing-covers with two teeth. July. 



Eggs. — Laid on smaller twigs, between the twig and the leaf stalk. 



Larva. — At first it makes burrows in the wood under the bark; later 

 channels at centre of twig, and finally a deep circular groove which 

 causes twig to break ofif. It usually changes to a pupa in the severed 

 twig, but sometimes part of the larval and the pupal stage is passed 

 outside of the twig. 



Control. — Fallen twigs containing the grubs should be promptly 

 gathered and burned. 



Pine Wood Borers (Monohammus spp.). — Several species of Mono- 

 hammus are well known as pine and spruce wood borers. They are 

 large insects with long legs and long antennae. The following species 

 are common: M. scutellatus Say, a bronzy-black form, M. confusor 

 Kby., a brown form and M. titillator Fab., rare in the North. Logs 

 are preserved from their ravages by putting them in water or by 

 covering the log piles with a thick layer of spruce or balsam boughs. 



MELOID^ (BLISTER BEETLES) 



Blister Beetles. — (Consult Bull. 43, Div. Ent. U. S. Dep. Agric, 

 1903; Bull. ID, 111. Agric. Exp. Stn., 1900; 42d Rep. Ont. Ent. Soc.) 

 Blister Beetles are characterized by a long cylindrical soft body 



