CECIDOMYID^B. 



119 



15 



Fig. 38. Cecidomyidae. i, Lasioptcra; 2, Epidosis; 3, Cecidomyia; 

 4, Hornioniyia; 5, Trichopteromyia; 6, Lestremia; 7, IMiastor; 8, 

 Spaniocera; 9, i'atocha; 10, ('olpodia; u, Heteropeza; 12, Asynapta; 

 13, M'inneytzia; 14, Diplosis (Lestodiplosis}; 15, Winnertzia. 



stroying the plant-tissue. When first hatched the larvae 

 are colorless and translucent, with the alimentary canal 

 showing through the skin greenish. Later in life they 

 assume different shades of red or yellow. They have the 

 extraordinary number of fourteen segments, thus forming 

 an apparent exception to the larvae of all other insects, 

 which as a general rule, have thirteen. The supernu- 

 merary segment is placed between the head and first 

 thoracic segment. The larvae have nine pairs of stigmata 

 along the sides of the body apparent as more or less nip- 

 ple-shaped projections. The head is not differentiated; 



