24 MISC. PUBLICATION 5 0, U. S. DEPT. OF AGRICULTURE 



5. Female with 4 to 5 antepygidial bristles on each side. Male with 3 



large antepygidial bristles on each side and a conspicuous median 

 process on tergum VII projecting over pygidium 



Dolichopsylla Baker. 

 Female with less than 4 antepygidial bristles. Male seldom with 3 

 large antepygidial bristles and never with process on tergum VII 6 



6. Last segment of each tarsus with 6 pairs of lateral plantar bristles, 



the third being shifted ventrally and its place taken by a more 



slender lateral pair Dasypsyllus Baker. 



Last segment of each tarsus never with more than 5 pairs of lateral 

 plantar bristles 7 



7. Tibia III with a comblike row of 3 or 4 shorter, outer setae between 



long, middle, and apical bristles ; movable finger of male with 1 



or more black, spinolike setae Amphipsylla Wagner. 



Tibia III without such a comblike row of setae 8 



8. Femur I never with more than a single seta on outer surface 9 



Femur I with several setae on outer surface 11 



9. Segment I of tarsus III longer than segments II to IV 



Tarsopsylla Wagner. 

 Segment I of tarsus III shorter than segments II to IV 10 



10. Movable finger with a submarginal row of 4 to 7 short, black, sub- 



equal, spinelike setae. Ventral margin of sternum X of female 



not angulate Orchopras Jordan. 



Movable finger with 3 to 4 unequal, submarginal, black, spinelike setae. 

 Ventral margin of sternum X of female usually distinctly anccuia^e 



Opisodasys Jordan. 



11. Front with 3 rows of setae. Female with 2 receptacula seminis 



Atyphloceras Jordan and Rothschild. 

 Front seldom with 3 rows of setae. Female with 1 receptaculum 

 seminis 12 



12. Eyes vestigial or absent ; 4 or 5 setae in ocular row 



DactyJopsyUa Jordan (Subgenus: Foxclla Wagnor.) 

 Eyes present, although sometimes distinctly reduced in size, never 

 vestigial; usually only 3 setae in ocular row 13 



13. Pronotal comb with short spines, not heavier in pigmentation than 



pronotum itself. Circumpolar. 



Mioctenopsylla Rothschild (Syn. : Borcopsyllus Ewing). 

 Pronotal comb with usual long, heavily pigmented spines 14 



14. Inner surfaces of coxae II and III with thin setae from base to apex; 



labial palpus usually extending beyond apex of trochanter I 15 



Inner surfaces of coxae II and III with thin setae at most on distal 

 half; labial palpus not reaching apex of trochanter I 17 



15. Sternum VIII of male broad, unreduced, bearing several to many setae. 



Basal abdominal sternum of female without patch of lateral setae. 



Restricted to North America Thrassis Jordan. 



Sternum VIII of male much reduced, narrowed and usually extended into 

 a horizontal process 16 



16. Pronotal comb with less than 12 spines on a side Oropsylla Wag- 



ner and Ioff (Subgen. : Diamanus Jordan) Opisocrostis Jordan). 

 Pronotal comb with 12 or more spines on a side AmpJinlius Jordan. 



17. Sternum VIII of male vestigial, without setae. Old World species 



introduced into North America Nosop.syllux Jordan. 



Sternum VIII of male modified and bearing 1 or more setae 18 



18. Pronotal comb usually with less than 32 spines on a side : movable finger 



of male with 1 or more black, spinelike setae. Parasitic on mammnls 



Trichopsylla Kolenati (Synonyms: Meg- 



atothris Jordan, Malaraeus Jordan) (Snbgen. : Pleochartis Jordan). 



Pronotal comb always with more than 12 spines on a side ; movable 



finger of male usually without black, spinelike setae. Parasitic on 



birds Ceratophyllus Curtis. 



19. Only anterior submarginal row of frontal bristles pigmented and spine- 



like ; front with anterior margin broadly rounded 



Ctenophyllus Wagner. 



All cephalic setae with black pigment and more or less spinelike ; front 



with anterior margin subangulate. Nearctic Stenistomera Rothschild. 



