168 ' THE CANADIAN ENTOMOLOGIST 



black line from anterior end of the median line runs on each side obliquely 

 caudoectad; remaining part of collum covered by a dense network of black 

 evident under lens. Vertex of head covered with similar black network; a 

 solid black area between eyes and antenna with pale spot at base of each antenna 

 as usual. Anal segment blackish. Legs light reddish brown. Antennae 

 blackish. 



Vertigial sulcus strongly marked, joining a deep arcuate transverse sulcus 

 running between the eyes. 



Collum margined below and part way up anterior edge as usual. Lower 

 end on each side well rounded. Above lower end on each side typically three 

 longitudinal striae of which the uppermost extends entirely across plate to the 

 margining sulcus and the others nearly as far. Second tergite extending below 

 level of collum, its infero-anterior angle produced below level of the posterior; 

 less broadly and less decidedly produced than in P. veiuistns and especially 

 than in P. hewitti, two species which it resembles. 



Segmental suture strongly impressed; widely curving opposite the pore, 

 which is widely removed from it. The metazonite on each ordinary segment 

 longitudinally striate beneath and up the side to a little below level of the pore, 

 the more ventral striae crossing to the prozonite, but the prozonite otherwise 

 nonstriate. The surface in general densely marked with minute shallow punctae 

 and short lines as in hewitti, venustus, etc. 



The anal tergite is produced beyond the anal valves as in heivitti and 

 venustus; but, unlike those species, the produced part in side view is seen to 

 bend moderately but distinctly upward, instead of being straight or slightly 

 depressed. The tip is not rounded as in heivitti, being decidedly angular as 

 viewed from above, and is broader than in venustus. X'alves margined as usual. 



Number of segments 48-52. 



Length about 33 mm.; width 2.5 mm. 



• Localities. — Waterton Lake. Type taken Aug. 24, 1883. A second female 

 was taken July 25, 1883, on the Wigwam River. Tyrrell coll. 



12. Spirobolus marginatus (Say.) 



On specimen taken at St. Nicholas, Quebec, by J. A. Salter, and one at 

 Renfrew, Ont., by Johansen. 



ENTOMOLOGICAL BRANCH— DIVISION OF FOREST INSECTS 



Bark-beetle control operations are nearly completed in the Coldwater 

 Valley, B.C., and are now being carried out in the Spious Valley. In addition 

 to the logging operations by which the infested timber is salvaged, hundreds 

 of infested trees, on the mountain sides and in isolated positions, have been 

 felled and burned so as to kill the broods of beetles in the bark. The slash 

 from all this work will be burned during June. Last week Mr. Hopping gave 

 an open air lecture to the Dominion forest rangers at the Spious Creek camp, 

 explaining to them, on the ground, helpful details regarding the infestation. 



— Entomological Branch News Letter 



Mailed June 25th, 1920. 



