The Collaborative International Dictionary
Pulex \Pu"lex\, n. [L., a flea.] (Zo["o]l.) A genus of parasitic insects including the fleas. See Flea.
Wikipedia
Pulex is a genus of fleas. It comprises six species. One is the human flea (P. irritans), and the other five are confined to the Nearctic and Neotropical regions.
Usage examples of "pulex".
The sharp whistling notes of the ilex and the pulex and the index are heard in the meadows, while the marshes are loud with the song of the ranunculus.
There is no mistake as to the meaning and identity of pulex irritans, confound him!
You have not considered the plight of Pulex irritans, the human flea: Unless prompt action is taken, future generations will know this heritage from Neanderthal man only by studying dried specimens in museums.
When the furs were discarded and man chose a more sanitary life it was a question of time, but Pulex irritans was doomed.
The generic name, Pulicaria, refers to this property, the Latin name for the flea being Pulex.