vi Preface. 



work, A special glossary and drawings of anatomical details will 

 familiarize the student with unusual terms. The keys are intended 

 only for adult insects as there is as yet no complete guide to the 

 younger stages, although a few hints are given in the key to or- 

 ders to indicate the position of immature forms. 



For a bibliography of the more important papers dealing with 

 the further classification of North American insects, the student is 

 referred to Banks, Bulletin No. 81, Bureau of Entomology, U. S. 

 Department of Agriculture (1910). 



Preceding each family name are cited several representative 

 genera, and, in the case of a number of economically important 

 species, the common and specific names are also given, inclosed in 

 brackets after the generic name. Thus the genera are in heavy- 

 face type, the Latin specific names in italics, and the common 

 names in Roman. A few synonyms have been inserted, in italics, 

 both for genera and for families, to associate the names here used 

 with others commonly occurring in publications. The family 

 names have been formed in accordance with the rule of the zoo- 

 logical code requiring the suSix-tWce after the root of the oldest 

 genus name, although this has resulted in a number of minor 

 changes in orthography. The pronunciation of the Latin names 

 is indicated by an accent mark, placed over the vowel in the ac- 

 cented syllable, a long vowel indicated by a grave accent {e.g. e) 

 and a short one by an acute accent {e.g. e). 



The Linnean classification of insects into seven orders has been 

 long abandoned as an artificial grouping of unrelated forms. We 

 have followed the unified ordinal groups essentially as limited by 

 Handlirsch.^ 



The families of a few of the orders recently monographed have 

 been adopted almost without change. Thus the Dermaptera are 

 based on Burr,- the Hemiptera on Renter,^ the Lepidoptera to a 

 great extent on Forbes,^ the Mallophaga on Kellogg,^ the Strepsip- 

 tera on Pierce,^ and the Trichoptera on Ulmer.' 



' Die fossilen Insekten xmd die Phylogenie dcr rezenten Formen. Leipzig, 1908. Wilhelm 

 Englemann. 



2 Wytsman's Genera Insectorum, fase. 122 (1913). 



aOefv. Fin. Vet. Forh., liv, (1911-12). 



4 Psyche, xxi, 53-65 (1914). 



6 Wytsman's Genera Insectorum, fas-. 66 (1908). 



6 Bull. U. S. Nat. Mus., No. 66 (1909). 



' Wytsman's Genera Insectorum, fasc. 60 (1907). 



