70 T. C. WHITE ON THE LARVA OF CORETHRA PLUMICORNIS. 



lias been to me a subject of much interesting observation during the 

 last two months will be also to you a source of much pleasure and 

 instruction. I have endeavoured in this paper to be as clear in my 

 description as the necessarily complicated condition of this larva's 

 anatomy would permit. I have left a great deal more to be worked 

 out, and difficult work too. I feel that I have not been erroneous in 

 any of the details I have set before you, and though I may be wrong 

 in the interpretation of the offices I have assigned to the various 

 organs, I think my critics will find it more easy to criticise than to 

 work out a contradiction. I have faithfully described what very 

 good appliances and careful observation permitted me to see, and I 

 leave the subject in your hands, feeling that there never was one in 

 which it was more necessary to remember the injunction of that 

 careful observer Dr. Braxton Hicks, viz., "to follow truth with 

 hesitating steps/' 



DESCRIPTION OF PLATE II. 



Larva of Corethra plumicomis 



Fig. 1. — Eyes, and their connection with the brain. 



Fig. 2. — Branched hairs, and their connection with muscles and ganglion. 

 Fig. 3. — Progressive stages in development of ovisacs. 

 Fig. 4. — Sympathetic nerve-cells attached to wall and valve of dorsal 

 vessel. 



