ur setekon f VON Ss, 
PLATES. 
Priate I. Work of the pine-destroying beetle of the Black Hills .......----.- 
Ii. Work of the coarse-writing bark beetle .......-..-------+---..----- 
III. Work of the pine-destroying beetle of the Black Hills. Fig. 1.— 
Primary galleries and larval mines in inner bark. Fig. 2.—Marks 
of primary galleries on surface of scoring chip -.....---.-------- 
IV. Work of the pine-destroying beetle of the Black Hills. Fig. 1.— 
A, Primary galleries, larval mines, pupa cases, and exit holes; 
B, Primary galleries grooved in surface of wood in chip cut from 
railroad tie. Fig. 2.—Evidence of cutting living trees. A, Scor- 
ing chip from railroad tie, showing surface of wood not marked 
Ay insects; B, Showing inner surface of bark from same chip---- 
V. Work of the Oregon Tomicus. Fig. 1.—4A, Galleries engraved in 
surface of wood cut from old dead tree; B, Bark with inner 
portion destroyed by galleries and larval mines. Fig. 2.—Gal- 
leries in inner bark and surface of wood of railroad ties and edg- 
hig Si Wah OS eG oe eG ee BRC Se ne eA es eee met 
VI. Work of the rock-pine wood-engraver (Pityogenes cariniceps Lec.). 
Galleries in inner bark and surface of wood .......------------- 
VII. Scenes in the pine forests of the Black Hills Forest Reserve—work 
of Dendroctonus ponderosa Hopk. Fig. 1.—Small freshly attacked 
pine tree, showing pitch tubes. Fig. 2.—Marks of primary gal- 
leries on the surface of wood when bark is removed. Fig. 
3.—Freshly attacked tree, showing pitch tubes; adjoining tree 
not attacked. Fig. 4.—Dead tree, outer bark removed by 
NG TE DISS ee ne Se A PE Rega 
TEXT FIGURES. 
Fic. 1. Work of the pine-destroying beetle of the Black Hills.......-.-.---- 
Pa VOLks One OreronUNomiCusees == 26 san > = sees aicice er a eae 
oa) OF bine Orecon “TOMmIcuss.2.--22-ssscse2o5=- 1c e- cease eee 
ah MV Ghelce Cost del aver Orreeoval 4 Novaniebls|- Senso ne act oree Spe be a oebaEeoooer ee 
5: Work of the rock-pine wood-eneraver.. ..<- .2--ae0c cscs eet see 
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