DR. J. BRAXTON HICKS ON UNDESCRIBED SENSORY ORGANS IN INSECTS. 151 
Fig. I. Trochanter-femoral joint of Panorpa communis (Scorpion- fly). 
1 & 2. Both surfaces : a a> organs. 
3. Trochanter-femoral joint of Tetriw : a a, organs. Diameter of each, TJ l 0T f inch. 
Fig. K. Trochanter of Gerris : a a, organ. 
1. Organs in situ. 
Vesp 
erve 
Fig. M. Leg of Formica rufa (Wood- Ant). 
1. Trochanter-femoral joint, showing organs (a a), and nerves passing to them (bb). Diameter 
of organs -g^. 
2. Femoral-tibial joint : a a, organs ; b b 3 nerves. 
3. Tibio-tarsal joint, showing the nerve (a) proceeding to the numerous hairs on under surface 
of first tarsal joint. 
Fig. N. Organs on trochanter-femoral joint of Tenthredo (Saw-fly). 
1 . Organs in situ. 
2. Section of them. 
Gryllus viridissimus 
1. Of fore leg: a, organs. 
2. Organs enlarged. 
Fig, P. Palpus of Musca vomitoria (Blow-fly). 
1. Organs in situ. Diameter ir[ i J1> inch. 
2. Organs magnified. 
Fig. Q. Organs on palpus of Vespa Crabro. 
1. a, organs in situ on basal joint. Diameter in Vespa vulgaris -hjVo inch. 
2. Enlarged section of one organ: a, nerve expanding at termination. 
3. Organ magnified^ seen from above. 
4. Apex of the palpi. 
Fig. R. Organs in Apis mellifica. 
1. Labium and ligula, &c. : a, organs at base of labium and mandible. 
2. Enlarged view of base of labium. 
3. Lip of labial palpi : a, papillae. 
4. Lip of maxillary palpi. 
5. a, end of ligula, covered with compound hairs, enlarged at b. 
Tab. 
Fig. A. Megachile lignisecans. 
1. Organs on base of tongue (a) ; on base of palpi (b). 
2. Apex of labial palpi. 
Fig. B. Palpus of Nomada succincta : a a, organs. 
A, g- C. Apex of palpi of Lepidoptera. 
1. OfArgynnis Paphia : a, aperture of tube j b, nerve expanding on apex of the tube. 
2. Of a Geometer-moth : a, aperture of tube; b, nerve expanding on apex of the tube. 
Fig. D. Palpus of Bibio Marci. 
1. Second segment, showing cavity (a). 
2. Enlarged view of portion of cavity. 
3. Apex of palpus. 
