54 



SOME INSECTS INJURIOUS 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: 



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



holes. (Original.) 



BRACON (MELANOBRACON) WEBBI N. SP.« 



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



segment without a triangular elevated 



^X 



Fig. 23.— Bracon (Me- 

 lanobracon) webbi : 

 Dorsum of second ab- 

 dominal segment. 

 Greatly enlarged. 

 (Original.) 



Fig. 24.— B ra con 

 (Melanobracon) 

 webbi: First four 

 antennal joints. 

 Greatly enlarged. 

 (Original.) 



area but with shallow, almost oblique im- 

 pressions as diagramniatically represented 

 in figure 23. 



Female: Length, ll mm , exclusive of ovi- 

 positor, which is 6 mm ; antennae 69-jointed ; 

 proportions and relation of first four joints 

 approximately as in figure 24; joints 4 to 

 55subequal, becoming wider than long; 

 joints 55 to 69 becoming longer than wide, 



the apical joint conical. Petiole of first discoidal cell about as long as second and 

 third joints of antenna combined. Second dorsal abdominal segment perfectly 

 smooth. 



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



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



Hopk. U. S. No. 5896a; reared by 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 larvae 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 



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

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



