THE MOSQUITOES OF THE SOUTHEASTERN STATES 63 
cannot be employed owing to the loss of scales or appendages. When 
there is doubt as to which part of a couplet the specimen fits, it is 
the practice to follow out both divisions to find a later fit if possible. 
When a character is mentioned (usually within the brackets) in one 
part of a couplet but not in the other, it may or may not be present 
in one or more of the species to which the other part of the couplet 
leads and is referred to later with each of these species or groups. 
While these are not specific characters, they are of assistance at times 
in determining which division of the key to follow. 
_--Tccypur 
Tesoro tury 
¢ 
| LDasa/ 
ee segmental 
i Land 
ZN aa 
on a 
Y 7 S< ae. 
‘ ae 
ve 2 7 Se Basal rings ~~~ —>:, 
Te \ 
ae \ 
‘ 
ENGUEL 14—Female mosquito (Aedes sollicitans), with names of the parts. 
As previously mentioned, a preliminary identification of the genus 
is not required in using the key to eile In practical experience 
it is found that specific characters in the adult frequently are more 
easily recognized than generic characters, and in routine work most 
identifications are made without reference, for example, to the 
thoracic bristles, the genus being known by the recognition of the 
species. However, some of the genera, such as Anopheles and 
Megarhinus, are recognizable on sight, and in the larval stage prac- 
tically all the species fall naturally into the generic groupings, as 
may be noted in the larval key. | 
