Muttkowski—The Fauna of Lake Mendota, 
473 
Table 4. Cdeoptera and their Relations to Aquatic Life. 
Obtaining air in gaseous form 
Obtaining air in 
solution 
Aquatic 
Water Breathers 
Name 
Terrestial 
Surface- 
air 
come to 
surface to 
breathe 
Submerged 
air 
capture 
gas 
bubbles 
Air passes 
out of so¬ 
lution in 
film out¬ 
side of 
body and 
is breath¬ 
ed by spir¬ 
acles 
Air passes 
out of so¬ 
lution 
within 
body 
Hygroblidae 
Larva. 
X 
X 
Pupa... 
Adult.... 
Dytiscidae 
Larva . 
X 
Pupa. 
X 
X 
Adult... 
X 
X 
X 
Hydrophilldae 
Larva pars.. 
X 
X (Berosi- 
X ni) 
Pupae pars... 
X 
Adult... 
X 
X 
Donaciinae 
Larva... 
X* 
Pupa.. 
x"^ 
Adult. 
X 
X 
X 
Haemonia adult.. 
X 
Gyi'inidae 
Larva... 
X 
- Pupa. 
X 
X 
- 
Adult. 
X 
X 
X 
Cyphonidae 
Larva. . 
X 
Pupa.. 
X 
Adult. 
X 
Hallplidae 
Larva. 
X 
Pupa. 
X 
Adult.. .. .... 
X 
X 
Dryopidae 
X 
)■ Pupa. 
X 
Limnius f .; 
X 
Psephenus 1 Larva. 
X 
Elmis V Pupa. 
X 
Dryops 1 Adult. 
X 
X 
*The Donaciinae live submerged, but obtain their air by sinking the caudal hooks 
into the air vessels of aquatic plants—hence are indirectly surface-breathers. 
