282 Mr. C, J. Gahan on larvm of Trictcnatoma cliildrcni, 



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

 transparent 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 DascillKS 

 davidsoni, 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. 

 98-96, 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. ccrvinus, and the 9tli tergite of the 

 abdomen is more rounded behind and appears to have no 

 apical processes ; but the structure of the mouth parts and 

 appendages is essentially the same. 



Explanation of Plate VI. 



[See Exj)lanation fucimj the Plate. 



