152 DR. J. BRAXTON HICKS ON UNDESCRIBED SENSORY ORGANS IN INSECTS 
Maxillary palpus of Dyticus 
b 
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 tw 
Fig, G. Palpi of Melanotus. 
1. Apex of maxillary palpus. 
2. Apex of labial palpus. 
Fig. H . Palpus of Timarchus. 
ary 
J 0in ^ 
ma; 
Fig. I. 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 antennae 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. 
1. Shows the bladder-like membrane covered with tactile hairs (a a). 
2. Shows one of the hairs magnified. 
Fig. P. Palpus 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. 
