282 Mr. C. J. Galian on larvae of Tridcnatoma cliildreni. 



a section througli the spiracle. Viewed in the ordinary way as a 

 transjiarent object under the microscope, no such aperture could be 

 made out. 



The general resemblance that the larva of Dascillus 

 bears to a Lamellicorn larva has been remarked upon by 

 Erichson, and gives additional interest to the fact that the 

 spiracles show a great similarity in structure. 



A description, with figures, of the larva of DaMiJJus 

 ddtidsoni, Lee, a North American species, has been 

 published by Mr. J. J. Rivers in the "Proceedings of the 

 California Academy of Sciences," 2nd Ser. Vol. Ill, pp. 

 1)3-96, PI. II (1891), and an account also is given of its 

 habits. In this larva the head is considerably smaller 

 than in that of D. ccrviitns, and the 9th tergite of the 

 abdomen is more rounded behind and apjDears to have no 

 apical processes ; but the structure of the mouth parts and 

 appendages is essentially the same. 



Explanation of Plate VI. 



[See Ej'planat'wn faciwj the Plate.] 



