Scolytid proventriculi 



1 Pityogenes species, internal aspect of flattened segments, x no 



2 r o m i c u s balsameus Lee, end view, x no 



3 Gnathotrichu s materiarius Fitch, internal aspect of flattened 



segments, x i 10 



4 P h 1 o e o s i n u s dentatus Say, internal aspect of flattened seg- 



ments, x i io 



5 Polygraphus rufipennis Ki'rby, end view, x 1 1 o 



6 Chramesus hicoriae Lee, internal aspect of flattened seg- 



ments, x i io 



7 Xyleborus celsus Eich., internal aspect of flattened seg- 



ments, x i io 



8 Xylo terns lineatus Kirby, internal aspect of flattened seg- 



ments, x i io 



9 Dry ocoetes autograph us Ratz., internal aspect of flattened 



segments, x i io 



10 Tomicus integer Eich., internal aspect of flattened segments. 



x i io 



11 Dryocoetes sp., internal aspect of flattened segments, x iio 



798 



