ART. 1, MOSQUITOES OF THE UNITED STATES—DYAR. 33 
and remain living is not known, but periods of three or four years 
seem certain. 
A number of the species have predaceous larvae, feeding exclu- 
sively upon other mosquito larvae that are in the pools with them. 
Most of these are naturally other Psorophora, but some of the rapidly 
developing Aédes also fall victims. 
The genus has been subdivided on the characters of the male 
genitalia. In addition to these we will use the claws of the female, 
as follows: 
1: Claws ‘of the female simple_i_____._._____-- Subgenus Grabhamia Theobald. 
Glaws or thesemale: toothed Ls s+ = Slee hs eS ee ee eee as ee ees 2. 
2. Male claspette with setae evenly over the bulbous tip. 
Subgenus Psorophora Robineau-Desvoidy. 
Male claspette with all the setae on the inner aspect, in one species soldered 
Loe they side piece ===——— === Subgenus Janthinosoma Lynch Arribalzaga, 
KEY TO THE UNITED STATES SPECIES OF PSOROPHORA, 
1<Clawsiotathe semale footed. = 2 4 es ee ete es Se Pe 
Claw SrOfmbhewte mie Leys iri po ee ee os ee se 8. 
Ze MeSONOLIINe With Smooth anudelareas= 22 s—= 2k es ee ee 3. 
Mesonotumuluentinelys scaled] 22 fae: She pawns es ee eee ES ys 
38. Mesonotum with median stripe of golden scales________________________ 4. 
Mesonotum’ without such stripe22=—— = === 2 ee es ee howardii Coquillett. 
4, Legs with many outstanding scales________.___-_._-_____ ciliata Fabricius. 
Legs smooth, without outstanding scales________----_--------- ctites Dyar. 
5) ind Jecsi wath, raised), outstanding escales! == oe eee =4G; 
Hind legs) smooth, withoutsoutstanding ‘scales=—= <2. ie 
6. Thorax without median dark stripe_______----_-_-_--- sayi Dyar and Knab. 
Thorax with median dark stripe__-------___-_---- horridus Dyar and Knab. 
7. Penultimate joint of hind tarsi white________-_________ discrucians Walker. 
‘Earsi without, whites ==. > see 2h 8 es cyanescens Coquillett. 
8; Yellowish species withespotted swine tes = ee ee 9. 
Blackishispecies: with peppered swings. = ss eS ee ae 10. 
9. Costa pale with two black spots beyond the middle___-_signipennis Coquillett. 
Wing not Sommarkedss_ 2. + eee o te ee ee discolor Coquillett. 
10. First hind tarsal joint with a middle white ring__columbiae Dyar and Knab, 
This joint without a whiteiring-]22 2222" 5222 pygmaea Theobald. 
Subgenus PSOROPHORA Robineau-Desvoidy. 
PSOROPHORA (PSOROPHORA) CILIATA Fabricius. 
Culex ciliata Fasricius, Ent. Syst., vol. 4, p. 401, 1794. 
Culex molestus. WIEDEMANN, Dipt. Exot., p. 7, 1821. 
Culex rubidus RoBINEAU-DEsvolpy, Mem. Soc. Nat. Hist. Paris, vol. 3, p. 404, 
1827. 
Psorophora boscii RoprineAu-Desvoipy, Mem. Soc. Nat. Hist. Paris, vol. 3, 
p. 413, 1827. 
Culex conterrens WALKER, Ins. Saund., Dipt., p. 427, 1856. 
A very large mosquito, with dusky wings and shaggy, white-ringed 
legs. Scales on palpi and base of proboscis mostly shaggy and erect, 
60466—23—Proc. N.M.vol.62——3 
