4fi THE PARASITES OF MAN. 



described in as few and simple words as possible, and as the 

 portraits of all species found thus far in Minnesota will be 

 given , those interested will find no trouble in recognizing them. 

 We divide the animal parasites mentioned in this report 

 into two groups: 



1. EXTERNAL PARASITES {Epizoa) which Hve upon 

 the skin, and 



2. INTERNAL PARASITES (Entozoa) which live in- 

 side of the organs and tissues of their hosts. 



I. EXTERNAL PARASITES. (Epizoa). 



A. FACE-MiTEs; BLACK-HEADS. {DemodecldcB) . 



B. ITCH-MITES. {Sarcoptldce) . 



c. harvest-bugs; JIGGERS. {Tromhldlldm.) 



D. GAMASiDS. ( GamasldcL'. ) 



E. TICKS. {Ixodldm). 



F. SUCKING-LICE. {Pediculi). 



G. biting-lice; feather-lice. {^laUopliaga). 

 H . FLEAS . ( StpJionajytera ) . 



I. LOUSE-FLIES. {lUppohoSc'ldiB) . 



J. OTHER FLIES. {Dlptero). 

 K. BUGS. {Hemlptera.) 



L. OTHER INSECTS. 



II. INTERNAL PARASITES. {Entozoa). 



A. FIVE-MOUTHS. {Llmjuatidld(e) . 



B. BOT-FLIES. {(Fsfrfd(i'). 



I. EXTERNAL PARASITES (Epizoa). 



A. FACE-MITES: BLACK-HEADS. 



(DemodeeidcB). 



These singular parasitic beings do not exactly fit into any 

 classification, at least naturalists have disagreed about their 

 true position until quite recently. But they are no doubt 

 mites with quite an anomalous structure, so much so in fact 

 that they might be said to form a sort of transition from 

 annelids or worms to arachnids or spider-like animals. As 

 they haA^e many points in common with itch-mites, which 



