OF THE ANTENNA OF INSECTS. 397 



D. Organs on antenna of Goerius oletiR. 



aaaa. Organs rather more frequent about the hairs. 

 b b. Hairs. 



E. Organs of Carabus. 



Fig. 1. C. violaceus. Section of antenna-wall, showing true hairs, a a. 



b b. Sacs with covering-in membranes raised above the general level. 



Fig. 2. Enlarged view of section of antenna-wall, showing the peculiar markings of the covering-in mem- 

 branes. Greatest diameter of the sacs y^Vo- Diameter at surface jijVu^'* "^ ""^ inch. 



Fig. 3. C. arvensis. The covering-in membrane seen from above, ribbed more than in C. violaceus. 



F. Segment of the antenna of Elater. 

 Fig. 1. Shows the sacs generally in front of the hairs. 



Fig. 2. Enlarged view of portion of same ; b. still more magnified, showing four or five papilla? on each. 

 Fig. 3. Section of the antenna-wall : a a. organs ; b. true hairs. 



G. Organs of antenna of Hydrophilus piceus. 

 Fig. 1. Enlarged view of a portion of surface. 

 Fig. 2. Section of antenna-wall, showing the various conditions of the covering-in membrane. 



H. Portion of antenna q/"Dynastes Hercules. 



Fig. 1 . Part of one lamella, a a. Normal sacs. 



b b. Sacs distorted at margin. 

 Fig. 2. Section of antenna-wall. Diameter ytuu °f ^^ inch. 



I. Antenna of Geotrupes stercorarius. 



Fig. 1. Enlarged view of upper surface of lamella. 



a a. True hairs. 



b b. Organs. 

 Fig. 2. Section of antenna- wall. 



a a. True hairs. 



b b. Organs. 



K. Antenna q/'Lucanus Cervus. 



Fig. 1. Surface of lamella, showing the organs and their spines. 

 Fig. 2. Section of antenna-wall. 



a. True hair-follicles. 



b b. Organs with spinous terminations. 

 Fig. 3. Terminal lamella with cavity. There are sometimes two. 



L. Antenna q/Dyticus marginalis. 



Fig. 1. Last two segments of antenna, showing — 



aaaa. Dwarf hairs (tactile) . 



bbb b. Peculiar structure on one aspect only (see Fig. 3). 



c. Nerve passing to the structures and dwarf hairs. 

 Fig. 2. Enlarged view of both tactile hairs and organs. 

 Fig. 3. Enlarged view of organs. Diameter ^A^ of an inch. 

 Fig. 4. Enlarged view of tactile hairs. 



