Scolytid proventriculi 



1 Dendroctonus piceaperda Hopk., end view, x 110 



2 Toraicus caelatus Eich., internal aspect of flattened segments. 



x 1 10 



3 To mi cuts caco graph us Lee, internal aspect of flattened seg- 



ments, x i 10 



4 Pityogenes species, internal aspect of flattened segments, x i io 



5 Xylocleptes species, internal aspect of flattened segments, x iio 



6 Tomicus calligraphus Germ., internal aspect of flattened seg- 



ments, x IIO 



7 Dendroctonus terebrans Oliv., internal aspect of flattened 



segments, x i io 



8 Tomicus p i n i Say, internal aspect of flattened segments, x i io 



79 6 



