1939] 
Mosquitoes of Massachusetts 
127 
4. Tubercles of inner anterior clypeal hairs separated by at 
least the width of one of these tubercles ; antepalmate 
hairs on segments 4 and 5 usually single; palmate 
tufts on segment 2 usually well developed : 
quadrimaculatus 
Tubercles of inner anterior clypeal hairs so close to- 
gether that another tubercle of similar size could not 
be placed between them 5 
5. Inner anterior clypeal hairs not minutely feathered to- 
ward tip ; antepalmate hairs of abdominal segments 4 
and 5 usually double or multiple 6 
Inner anterior clypeal hairs minutely feathered toward 
tip ; antepalmate hairs of abdominal segments 4 and 5 
usually single : walkeri 
6. Antepalmate hairs of abdominal segments 4 and 5 usu- 
ally with 2 branches, rarely 1 or 3 ; posterior clypeal 
hairs usually with 2 branches from near base ; inner 
anterior clypeal hairs single, unbranched : 
punctipennis 
Antepalmate hairs of abdominal segments 4 and 5 
usually with 3 branches, rarely with 2 or 4 ; posterior 
clypeal hairs usually long with apical branching ; in- 
ner anterior clypeal hairs unbranched or with 2 or 3 
branches beyond middle : maculipennis 
Ivey to the Genus Culex 
Adults 
1. Abdominal segments with transverse apical white 
bands: _ apicalis 
Abdominal segments with basal white bands or none :__2 
2. Abdominal segments with basal white bands 3 
Abdominal segments without basal white bands : 
salinarius 
3. Basal white band of the second abdominal segment tri- 
angularly produced medianly: pipiens 
Basal white band of the second abdominal segment 
transverse : territans 
Larvae 
1. Antenna with the tuft at or before the middle. ...territans 
Antenna with the tuft beyond the middle 2 
