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V".. ^ 



PSYCHE 



A JOURNAL OF ENTOMOLOGY 



Established in 1874 



VOL. XXVII APRIL- JUNE, 1920 NUMBERS 2-3 



Prodr'jas persephone Scudder 



CONTENTS 



A Comparison of the External Anatomy of the Lower Lepidoptera and Trichoptera from the 



Standpoint of Phylogeny. G. C. Crampton 23 



A Comparison of the Genitalia of Male Hymenoptera, Mecoptera, Neuroptera, Diptera, 

 Trichoptera, Lepidoptera, Homoptera, and Strepsiptera, with thoae of Lower Insects 



G. C. Crampton 34 



The Subfamilies of Formicidas, and other Taxonomic Notes. W. M. Wheeler .... 46 



Odonata of Chatham, Massachusetts. R. U. Howe, Jr .V) 



The Braconoid Genus Trachj-petus Gu^rin. C. T. Brues 'v.') 



An Infestation of the White-Pine Aphid. H. B. Peirson i;2 



Two New Schendyloid Chilopods from Guatemala. R. V. Chamberlin 63 



Proceedings of the Cambridge Entomological Club tit) 



Exchange Column i~ 



