X0.1417. REVISION OF AMERICAN SIPHONAPTERA— BAKER. 123 



The following- paper is to be considered only as a supplement to the 

 Revision. The bibliogTaphical references are either entirely new or 

 are made necessary by changes in nomenclature. For completeness 

 the two papers should alwaj^s be used together." Repetitions have 

 been avoided wherever possible. The subjects in the body of the 

 paper have been arranged in the same order as in the Revision, so that 

 cross references may be readil}- made. 



The following grouping- into families is made with a very meager 

 characterization. Numerous other diiferential characters of family 

 value can be added. The families as indicated here are sharply defined, 

 the difference in the general habitus of the groups being very clear to 

 anyone who has handled specimens of this order in any numbers. 

 Their fuller characterization must be accomplished b}" some one who 

 has access to the material sufticient for working out the taxonomy 

 of the whole group for the entire world. General classification can 

 only be built upon a very wide and very special knowledge of the 

 anatomy of species. Hence the classification is here only carried far 

 enoug-h to make clear the relationships of the various groups for the 

 use of American students. It is, however, evident that we can not 

 hope to get even the American foi-ms properly classified without taking 

 cognizance of all that is being done in other parts of the world. 



Order SIPHONAPTERA Latreille. 



1904. *SVy;/iu;/,a/^/mf TiKAiJoscHi, Archiv. de Parisit. , VIII, p. 302. 

 SYNOPSIS OF FAMILIES. 



A. Thoracic segments strongly shortened and constricted; lal)ial palpi without 

 pseudo-joints; third joint of antenuie without completely 

 separated pseudo-joints. 

 B. .Vlaxilhe without or with very short and broad projecting lamin;e, their palpi 

 extending beyond anterior coxte; head strongly angulated 

 anteriorally in both sexes; metathoracic epiphyses extending 

 over nearly two oV even three abdominal segments; the female 

 becoming eiidoparasitic when gravid, with globose, enor- 

 mously dilated abdomen, in which the original chitinous 



sclerites are mostly obliterated Rhynchoprionid.e 



BB. Maxilla' with a long, narrow, curved lamina which projects downward and 

 backward, their palpi equaling the anterior coxte, or shorter; 

 head evenly rounded in both sexes; metathoracic epiphyses 

 extending over but one abdominal segment; gravid female 

 with abdomen vermiform Hectopsyllid.e 



AA. Thoracic segments not strongly shortened and constricted, their epiphyses 

 extending over but one abdominal segment; labial i^alpi with 

 three or more pseudo-joints; maxillary palpi almost always 

 shorter than anterior coxpe; third joint of antennse with nine 

 more or less distinctly separated pseudo-joints. 



« A complete index (p. 167) has been prepared to accompany this papier in which 

 references to the earlier paper are indicated by italics. 



