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. 
A phis, pi. 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. ichneuo , to hunt), 
a genus of insects belonging to 
the hymenoptera. 
Mi cro gas'ter (Gr. mikros , small, 
and gaster , stomach y a small 
hymenopterous fly. 
Mo squi'to (Lat. musca , a fly), a 
well-known dipterous insect. 
Par then 0 gen'e sis (Gr. parthe- 
nos , a virgin, and gignomai , to 
be born), reproduction by means 
of unfertilized eggs. 
Pro'leg, one of the fleshy abdom¬ 
inal legs of insect larvae. 
Pu pa'tion (Lat. pupa , a doll), the 
process of undergoing the pupal 
condition. 
