A CHAPTER OF LIFE-HISTORIES. 85 
2. What advantages and what disadvantages must 
be experienced by a larva living in water ? 
Topics for Reports. 
The Life-history of a Beetle. 
A Life-history I have Observed. 
VOCABULARY. 
Aphis, pl. aphides (Gr. apheides, 
lavish), a plant-louse. 
Cad‘dis-fly, a name given to an in- 
sect whose larva lives in the 
water and builds for itself a 
tubular case. 
Gnat, a mosquito. 
Ich neu’mon (Gr. zchneuo, to hunt), 
a genus of insects belunging to 
the hymenoptera. 
Mi cro gas’ter (Gr. mitvws, small, 
and gastfer, stomach, a small 
hymenopterous fly. 
Mo squi’to (Lat. musca, a fly), « 
well-known dipterous insect. 
Par then o gen’esis (Gr. parthe- 
nos, a virgin, and gzgnomui, to 
be born), reproduction by means 
of unfertilized eggs. 
Pro’leg, one of the fleshy abdom- 
inal legs of insect larvz. 
Pu pa’tion (Lat. supa, a doll), the 
process of undergoing the pupal 
condition. 
