432 



JOURNAL OF ECONOMIC ENTOMOLOGY 



[Vol. 10 



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Fig. 21. Pterocomma media. 1, distal segment of antenna. 2, cornicle. P. 

 populea. 3, distal segment of antenna. 4, cornicle. P. smithies. 5, distal segment 

 of antenna. 6, cornicle, P. hicolor. 7, distal segment of antenna. 8, cornicle. 

 P. heulahemis. 9, distal segment of antenna. 10, cornicle. P. flocculosa. 11, 

 distal segment of antenna. 12, cornicle. P. soZtcis. 13, distal segment of antenna. 

 14, cornicle. P. populifoUoe. 15, distal segment of antenna. 16, cornicle. Eu- 

 ceraphis lineata. 17, distal segment of antenna. E. brevis. IS, distal segment of 

 antenna. E.deducta. 19, distal segment of antenna. E.betuloe. 20, distal segment 

 of antennee. E. mucida. 21, distal segment of antenna. E. flam. 22, distal seg- 

 ment of antenna. E. gillettii. 23, distal segment of antennae. All figures drawn 

 to the same scale. 



