54 



SOME INSECTS INJITEIOUS TO FORESTS. 



far, to appreciably thin the ranks of Monohammus. Following is the 

 description, by Mr. H. L. Viereck, of the species of Bracon mentioned 

 above: 



w 



Fig. 22.— The pine sawyer: Emergence holes of young adults in hark, a, Natural slzeol emergence 



holes. (Original.) 



BRACON (mELANOBRACON) WEBBI N. BFA 



Compared with, ulmicola b this species difiers as follows: Second dorsal abdominal 



segment without a triangular elevated 

 area but with shallow, almost oblique im- 

 pressions as diagrammatically represented 

 in figure 23. 



Female: Length, 11™=', exclusive of ovi- 

 positor, which is 6™™ ; antennse 69-iointed ; 

 proportions and relation of first four joints 

 approximately as in figure 24; joints 4 to 

 55 subequal, becoming wider than long; 

 joints 55 to 69 becoming longer than wide, 

 Petiole of first discoidal cell about as long as second and 

 Second dorsal abdominal segment perfectly 



Fig. 23.— Bracon (Me- 

 UzTiobracon) webbi: 

 Dorsum ol second ah- 

 dominal segment. 

 Greatly enlarged. 

 (Orlghial.) 



Fig. 2i.— Bracon 

 {Melanobracon) 

 webbi: First jour 

 antennal joints. 

 Greatly enlarged. 

 (Original.) 



the apical joint conical 



third joints of antenna combined 



smooth. 



Type. — No. 12585, U. S. National Museum. 



Type locality, Baxterville, Miss., March 19, 1909. 



Hopk. U. S. No. 5896a; reared hj Mr. J. L. Webb, of the Bureau 



of Entomology. 



REMEDIES. 



Fire. — During the logging operations upon the storm-felled 

 timber near Baxterville, Miss., in 1908, the felled timber was burned 

 over with the object of destroying the broods of the sawyer. Sub- 

 sequent examinations of this burned-over area disclosed the fact 

 that a very small percentage of the larvse had succumbed to the 

 heat. This method is, therefore, not to be recommended. 



Scoring. — Several experiments were tried to determine the effi- 

 ciency of "scoring," or removing a strip of bark along the upper 

 surface of a log. In some instances salt was sprinkled along' the 



o By H. L. Viereck, Agent and Expert, Bureau of Entomology. 

 b 1906, Trans, Am. Ent. Soc, pp. 176-177. 



