DR. J. BRAXTON HICKS ON UNDESCRIBED SENSORY ORGANS IN INSECTS. 151 



Fig. I. Trochanter-feraoral joint oi Panorpa communis (Scorpion-i!y). 



1 & 2. Both surfaces : a a, organs. 



3. Trochanter-femoral joint of Tetrix: a a, organs. Diameter of each, tj\iT7 inch. 

 Fig. K. Trochanter of Gerris : a a, oi'gan. 

 Fig. L. Trochanter of trochanter-femoral joint of Vespa Crabro. 



1. Organs in situ. 



2. Nerve proceeding to them. 

 Fig. M. Leg oi Formica nifa (Wood- Ant). 



1. Trochanter-femoral joint, showing organs [a a), and nerves passing to them {bb). Diameter 



of organs -giVu- 



2. Femoral-tibial joint : a a, organs ; b b, nerves. 



3. Tibio-tarsal joint, showing the nerve («) 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. 



Fig. O. Trochanter-femoral joint of Gryllus viridissimus. 



1. Of fore leg: a, organs. 



2. Organs enlarged. 



Fig. P. Palpus of Miisca vomitoria (Blow-fly). 



1. Organs in situ. Diameter -r^j^ inch. 



2. Organs magnified. 



Fig. Q. Organs on palpus of Vespa Crabro. 



1. «, organs in situ on basal joint. Diameter in Vespa vulgaris -p^Vo 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, papillas. 



4. Lip of maxillary palpi. 



5. a, end of ligula, covered with compound hairs, enlarged at b. 



Tab. XIX. 



Fig. A. Megachile lignisecans. 



1. Organs on base of tongue («) ; on base of palpi (6). 



2. Apex of labial palpi. 



Fig. B. Palpus of Nomada succincta : a a, organs. 

 Fig. C. Apex of palpi of Lepidoptera. 



1. Of Argynnis Papihia : a, aperture of tube ; 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. 



