198 MISC. PUBLICATION 273, U.S. DEPT. OF AGRICULTURE 



tered damaging the wood of western broadleaved forest trees are 

 the following : 



Species Hosts and distribution 



Brothylus gemmulatus Lee. . White and black oaks. Colorado and California. 

 Malaco-ptems tenellus (F.) . . Willow and poplar. Arizona and southern 



California. 

 Megacyllene antennatus 



(White) Mesquite. Southwest. 



Necydalis cavipennis Lee. . . . Oak, alder, and other hardwoods. Pacific coast 



and Arizona. 

 Neoclytus caprea (Say) .... Ash, oak, and mesquite. California, Utah, Ari- 

 zona, and Colorado. 

 conjunctus (Lee.) 



(fig. 94, B) Oak, ash, and madrone. Western States. 



Rosalia funebris Mots Alder, ash, California laurel, willow, and syca- 

 more. California to Alaska, and New Mexico. 

 Synaphaeta guexi (Lee.) . . . Oak, poplar, maple, and willow. Pacific coast. 



The blazed tree borer (Serropalpus barbatus (Schall.) ) of the 

 family Melandryidae, lays its eggs in dying or dead trees or liv- 

 ing trees from which the bark has been peeled. The long, slim, 

 white larvae mine the sapwood, making oval tunnels filled with 

 very fine dustlike frass. After two seasons in the larval stage, the 

 slender reddish-brown beetles, y 2 to % mcn l° n &> emerge in June 

 and July through perfectly round holes cut in the bark. This wood 

 borer is widely distributed throughout North America, breeding 

 in various coniferous trees. In the West it has been bred from red 

 fir, California incense cedar, lodgepole pine, ponderosa pine, red- 

 wood, Port Orford cedar, Engelmann spruce, and Douglas-fir, and 

 probably will be found in many other conifers. 



WOOD-BORING WEEVILS 



Some of the weevils (Curculionidae) belonging to the genera 

 Rhyncolus, Cossonus, Pissodes, and Cryptorhynchus are found at 

 times working in wood. The work of Pissodes has been previously 

 mentioned (pp. 39 and 176) . The Rhyncolus and Cossonus weevils 

 are small brown or black weevils less than y 4 inch long, with 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 decaying, they 

 are seldom of economic importance. 



The poplar and willow borer {Cryptorhynchus lapathi (L.) ) 

 (110) bores under the bark and into the wood of poplars and wil- 

 lows, making 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 % inch long, 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 is now prevalent in western Oregon, Washington, 

 and Idaho. 



CARPENTER MOTHS 



The larvae of some families of moths mine directly into the wood 

 of injured or weakened trees, where they may cause additional in- 



