48 PROCEEDINGS OF THE NATIONAL MUSEUM. VOL. 62. 
25. Filament of claspette shortly and slenderly sickle shaped, with more or 
lessvdistinetybasallinotehes= 28 ee Se ee Be 26. 
Filament of claspette with a broad expansion the whole length; basal lobe 
highly conical with strong spine____-----__--___ riparius Dyar and Knab. 
Filament of claspette short and smoothly widened; basal lobe moderate 
withiverysStrong) Spine=2242 25 es se eee grossbecki Dyar and Knab, 
Filament of claspette long, angularly widened at middle; basal lobe moder- 
ate, With Strong spines =]5 sss Soe eee squamiger Coquillett. 
26. Spine of basal lobe fairly strong; spines of ninth tergites long. 
fitchii Felt and Young. 
Spine of basal lobe weaker; spines of ninth tergites long_.__-mimesis Dyar. 
Spine of basal lobe much weaker; spines of ninth tergites very long. 
palustris Dyar. 
27. Apical lobe with short, curved, clinging setae. 
(Group Thibaulti) thibaulti Dyar and Knab. 
Setae onyapicall lobe normal 2202. Se ee See 28. 
28. Setae on apical lobe long, more or less outwardly directed. 
(Group Trichurus) cinereoborealis Felt and Young. 
Setae on apical lobe very short and few, inwardly directed. 
f alpinus Linnaeus. 
lpi ; 
(Group Alpinus) | nearcticus Dyar. 
Subgenus HETERONYCHA Lynch Arribalzaga. !” 
Group SERRATUS. 
AEDES (HETERONYCHA) BIMACULATUS Coguillett. 
Culex bimaculatus CoQquitLEttT, Proc. U. S. Nat. Mus., vol. 25, p. 84, 1902. 
A rather large yellow mosquito. Mesonotum yellow, yellow scaled, 
two black spots posteriorly in the integument. Abdomen black, with 
broad yellow basal segmental bands, the terminal segments wholly 
yellow; venter yellow. Legs yellow, the femora and tibiae black at 
their tips; first tarsal joint yellow with black tip, the remaining joints 
black, the second with a little yellow at base. Wings slightly infus- 
cated, scales dark, the costa and first vein broadly yellow nearly to 
apex. Proboscis yellow with black tip. 
The larvae live in muddy ground puddles following rain. The 
form is doubtless a race of the tropically distributed Aédes fulvus 
Wiedemann. The mosquito is of very striking coloration, but ex- 
tremely rare, so that it can not be considered troublesome. 
Distribution—Southern States. 
United ‘States Records. 
TExAS: Brownsville, August 30, 1916 (M. M. High). 
LOUISIANA: New Orleans, September 10, 1914 (W. V. King). 
ARKANSAS: Scott, September 23, 1909 (J. K. Thibault). 
122This subgeneric name becomes Ochlerotatus Lynch Arribalzaga in case Weteronycha 
is referred to the synonymy of Culec. 
