n.ASSIFU'ATlOX. 



I'iiri II coiuains tho di'si'riptions of the tainnvonus 

 I'tiiiiul in poultrv nud a discussion of the diftVicni 

 species, and it is placed for the most part in fine type 

 because of its railier technical nature. There are. 

 liowever. a number of points mentioned under the var- 

 ious species which are necessary to the poultry raiser 

 who desires (o obtain a thoroujrh knowledge of this 

 subject. I have endeavored to brin;; together in Part 

 IT (he entire history of each species, in order to show 

 the exact status of our present kno'wledge of the grouj). 



The Bureau is gradually collecting the original types 

 of many of these species, with a view to revising the 

 entire group and placing it upon a more scientific 

 Inisis. Tt is our desire also to obtain all the material 

 possible from various parts of this country, and we 

 invite poultry raisers, etc., to furnish bottles of alcohol 

 or formalin, and mailing cases for such sendings. All 

 correspondence should be directed to Dr. D. E. Sal 

 mow. Chief of the Bureau of Anin\al Industry, United 

 States Department of Agriculture, Washington, D. C. 



Worms si'ut to us for study or identification should 

 lirsi be washed in warm walei- and then ]>laced in 

 alcohol or in Hie preserving lltiid furnished by the 

 Bureau. 



The following classificatiim by genera is iargcly 

 based upon the papers by Blauchard (18926 and 1893). 

 In the specific diagnoses, the original descriptions and 



