152 DR. J. BRAXTON HICKS ON UNDESCRIBED SENSORY ORGANS IN INSECTS. 



Fig. E. Maxillary palpus of Dyticus marginalis, 



1. Apex of palpus : a, organs similar to antennffi; b, tactile organs; c c, nerves. 



2. Enlarged view of tactile organs. 



3. Enlarged view of 1 a. 



4. Largest tactile hairs. 

 Fig. F. Palpi of Hydrophilus piceus. 



1. Maxillary palpus. 



2. Labial palpus. 



3. Enlarged view of 1, with the two larger tactile hairs in centre. 

 Fig. G. Palpi oi Melanotus, 



1. Apex of ma.Nillary palpus. 



2. Apex of labial palpus. 



3. Portion of apex of maxillary palpus magnified. 

 Fig. H. Palpus of Timarchus. 



1. Shows the nerve (a) enlarged in last joint, going to the tactile hairs in apex. 



2. Tactile hairs of apex magnified. 

 Fig. L Palpus of a Carabus. 



1 . Showing the distribution of the nerve. 



2. Enlarged view of apical membrane. 

 Fig. J, Palpi of Carabus. 



1. Apex: 1 a, enlarged view of tactile hairs. 



2. Apex of another; hairs very small. 

 Fig. K. Palpi of Lampyris noctiluca. 



1. Apex of labial palpus, showing delicate hairs on membrane. 



2. Apex of maxillary palpus. 

 Fig. L. Palpus of Cychrus rostratus. 



1. Shows the distribution of the nerve. 



2. Enlarged view, a branch of nerve passing to each papilla, 



3. Apex of palpus of Goerius olens. 

 Fig. M. Palpi and antenna of Melolontha vulgaris. 



(1-3. Of the larva.) 



1. Apex of antenna. 



2. Apex of maxillary palpus. 



3. Apex of labial palpus. 



4. Apex of palpus of perfect insect. 

 Fig. N. Palpi of larva of Dyticus marginalis. 



1 . Apex of maxillary palpus. 



2. Apex of internal maxillary palpus. 



3. Apex of labial maxillary palpus. 

 Fig. O. Apex of palpus of Tetrix. 



L Shows the bladder-like membrane covered with tactile hairs [a a). 

 2. Shows one of the hairs magnified. 

 Fig. P. Paljjus of Panorpa communis. 



1. Apical segment of palpus, showing the nerve within and its branches. 



2. Exterior view of apex. 



3. Sectional view of apex. 



