290 COMPARATIVE ZOOLOGY. 
lancets; the thorax is globular; and the legs slender. 
The larvee are footless grubs. The Dipters number about 
24,000. Among them are the Mosquitoes (Culex); Hes- 
Fig. 262.—Metamorphosis of the Flesh-fly (Sarcophaga carnaria): a, eggs; b, young 
maggots just hatched; e, d, full-grown maggots; e, pupa; J, imago. 
sian-fly (Cecidomyia), so destructive to wheat; Daddy- 
long-legs (7ipula), resembling a gigantic Mosquito; the 
wingless Flea (Pulex); besides the immense families rep- 
resented by the House-fly (JZwsca) and Bot-fly (@strus). 
6. Lepidopters, or “ Butterflies” and “ Moths,” are 
known chiefly by their four 
\ \ ()) WV ( ¢") large wings, which are thick- 
| ly covered on both sides by 
| yi minute, overlapping scales. 
1) y) The scales are of different 
| colors, and are often ar- 
Fie. kere from the wings of vari- ranged in patterns of ex- 
ous Lepidopters. quisite beauty. They are in 
reality modified hairs, and every family has its particular 
form of scale. The 
head is small, and 
the body cylindrical. 
The legs are not used 
for locomotion. All 
the month parts are 
nearly obsolete except 
the maxille, which 
are fashioned into a 
“proboscis” for pump- 
ing up the nectar of 
Fic. 264.—Part of the wing of a Moth (Saturnia), 
flowers. The larvee, maguitied to show the arrangement of scales. 
