;[54 MISC. PUBLICATION 273, U. S. DEPT. OF AGRICULTURE 



Species Hosts and distribution 



Nothorhhia aspera Lee Douglas fir. Western States. 



Xylotreclius undulatus Say Pines, firs. Douglas fir, hemlock, and spruce. 



Western States. 



Xylotreclius nutilus Linsley White fir. California. 



Ulochaetes leoninus Lec_ Ponderosa pine, Douglas fir, and spruce. 



California to British Columbia. 



Xylotreclius nauticus Mann Oak, madrofia, and eucalyptus. California 



and Oregon. 



Neoclytus conjunctus Lee Oak, ash, and madroiia. Western States. 



Neoclytus caprea Say Oak and mesquite. Arizona, Colorado, and 



Utah. 



Brothylus gemmulatus Lee Oak. Colorado and California. 



Syuaphoeta gueaoi Lee Oak, maple, and willow. Pacific coast. 



Rosalia fimedris Mots Ash, California laurel, willow and alder. 



New Mexico and California to Alaska. 



Necydalis cavipennis Lee Alder and eucalyptus. Arizona and Califor- 

 nia. 



Xyloty^echus odliteratus Lee Aspen. Rocky Mountains. 



Xylotreclius insignis Lee Willow. California. 



Malacopterus teueUiis F Willow and poplar. Arizona. 



Cyllene antennata White Mesquite. Southwestern States. 



WOOD-BORING WEEVILS - 



(Curculionidae) ' . 



Some of the Tveevils belonging to the genera Rhyncolus^ Cossonus, 

 Pissodes^ and GryptorhynchxiH are found at times working in wood. 

 The AYork of Pissodes has been previously mentioned (pp. 33 and 138). 

 The Rhyncolus and Cossonus weevils are small brown or black 

 weevils less than one-fourth inch in length, wdth the head produced 

 into a snout. The larvae are white, legless, and comma-shaped. 

 Both adults and larvae may be found boring into and destroying 

 wood, but as the wood is usually in a decaying condition, they are 

 seldom of any economic importance. 



The poplar and willow borer {CryptoTliynclius lapathi L.) {57) 

 bores under the bark and into the wood of poplars and willows mak- 

 ing irregular more or less cylindrical tunnels which often so riddle 

 the wood as to cause heavy breakage. The adults are rough, dark- 

 colored weevils about one-fourth inch in length, with a band of 

 bright pink across the tip of the wing covers. This is an introduced 

 species which is gradually becoming widely distributed throughout 

 the country. It has recently been found causing serious damage to 

 willows along the Columbia River in Oregon. 



CARPENTER MOTHS 



(Cossidae) 



The larvae or caterpillars of some families of moths (Lepidoptera) 

 are wood boring in habit and mine directly into the wood of injured 

 or weakened trees, where they may cause additional injury which 

 may result in the tree's death. These injuries to the living tree often 

 appear as serious defects when the tree is converted into lumber. 

 The carpenter moths, belonging to the family Cossidae, principally 

 attack broadleaved forest, shade, and fruit trees. The adults are 

 large, mottled-gray moths, with spindle-shaped bodies and narrow, 

 strong wings of medium to large size. They are night flyers and lay 

 their eggs in bark crevices or on old wounds. The caterpillars, 

 which are nearly hairless, have both true legs and abdominal pro- 



