966 MOSQUITOES OF NORTH AMERICA 



keener in some species than in others. Those species with the strongest appetite 

 for blood will fly considerable distances from their breeding-places, if necessary, 

 to obtain blood. The males congregate in swarms, to which females fly singly 

 for sexual miion. 



Tables of the Species. 



ADtTLTS, structure, AND COLORATION. 



1. Tarsi ornamented with wliite or yellow 2 



Tarsi wholly dark colored 13 



2. Hind tarsi with a series of rings 5 



Hind tarsi all white beyond second joint 3 



Hind tarsi white beyond second joint, a black spot on the last joint 4 



3. Abdomen dorsally covered with scales, argyritarsis Robineau-Desvoidy (p. 967) 

 Abdomen clothed dorsally with hairs only lutzii Cruz (p. 971) 



4. Palpi with the last two joints white except narrowly at bases 



tarsimaculata Goeldi (p. 975) 

 Palpi with the last joint only white albinianus Wiedemann (p. 979) 



5. Hind tarsi with small basal rings only ; palpi wholly black scaled 



grabhamii Theobald (p. 1006) 

 Tarsi more conspicuously ornamented; palpi not wholly black scaled 6 



6. Tarsi and tibiae narrowly ringed and speckled black and white or yellow 8 



Hind tarsi with broad apical segmental white rings, not speckled 7 



7. Wings with four white spots on the casta bellator Dyar & Knab (p. 985) 



Wings with two white spots on the costa, five on the first vein 



neivai Howard, Dyar & Knab (p. 986) 



8. Wing-scales mostly blackish, many little patches of yellow ones 



vestitipemiis Dyar & Knab (p. 989) 

 Wing-scales black and white or yellow, several large concrete patches of 



black scales 9 



9. Hind tarsal joints with apical rings, the last joint wholly black 



maculipes Theobald (p. 990) 

 Hind tarsi with rings involving both ends of the joints, last joint mostly or 



wholly pale scaled 10 



10. Wing-scales broad and rounded 11 



Wing-scales narrowly ovate to lanceolate 12 



11. Tarsi yellow with small black dots mediopunctatus Theobald (p. 993) 



Tarsi black with white rings malefactor Dyar & Knab (p. 1000) 



12. Hind tarsi with numerous yellow rings strigimacula Dyar & Knab (p. 998) 



Hind tarsi with sparse white rings apicimactila Dyar & Knab (p. 995) 



13. Hind tibiae broadly white at apex ciseiii Coquillett (p. 1002) 



Hind tibiae without white apical ring 14 



14. Wings with a white spot at outer third of costa 15 



Wings without such spot on the costa 16 



15. Palpi marked with white; third vein extensively white in the middle 



pseudopunctipennis Theobald (p. 1014) 

 Palpi wholly black scaled; third vein wholly black scaled 



punctipennis Say (p. 1009) 



16. Wings with patches of yellowish scales, sixth vein with three black spots 



crucians Wiedemann (p. 1023) 

 Wings without patches of pale scales 17 



17. Wing at apex with a coppery spot on the fringe 



occidentalis Dyar & Knab (p. 1026) 

 Wing-fringe uniformly dark throughout 18 



18. Body blackish throughout, hair-scales of mesonotum dark brown 



atropos Dyar & Knab (p. 1032) 

 Body not wholly blackish, hair-scales of mesonotum yellow or white 19 



19. Palpi of the female with dull silvery white rings at the bases of the joints; 



scales of wings not distinctly massed at bases of fork-cells 



walkeri Theobald (p. 1033) 

 Palpi of the female blackish scaled throughout; scales of wings massed to 

 form distinct spots at the cross-veins and at bases of fork-cells 



guadrimaculatus Say (p. 1028) 



LARV^. 



1. Comb of the eighth segment with the teeth all long, equal 



neivai Howard, Dyar & Knab (p. 987) 

 Teeth of the comb alternatingly long and short 



J malefactor Dyar & Knab (p. 1002) 



l^sti-igimacula Dyar & Knab (p. 999) 



Teeth of the comb both long and short, irregular 2 



