PLATE IV. 



[Proc. Wash. Acad. Sci., Vol. IV, PI. XI.] 



Fig. I. Liposcia dubiosa Ks,hm. $. 



2. Synoplus brevipennis Ashm. 9 • 



3. Praon alaskensis Ashm. $ . 



4. Aphidius frigidus Ashm. 9 • 



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