liY R. J. TILLYAKD. 287 



consisted merely in the greater development of the sensilla? of 

 this region of the two wings, their contact acting as a guide in 

 flight, much as the reins act in the driving of a horse, or the 

 touch of the hand of one person in guiding another in the dark. 



To these structures, whether they act merely as a yiridf, or 

 whether they are more fully developed so as to fink the two 

 wings quite closely together, T propose to give the name "Wing- 

 coupling Apparatus," which 1 have already used in dealing with 

 the Planipennia(12). 



The complete, archaic wing-coupling apparatus consists of four 

 distinct parts, two belonging to the forewing, and two to the 

 hind. These are: — 



In the forew ing 



(1) The area of contact with the hind wing or its bristles. 



(2) The bristles developed along the border of that area. 

 In the hind wing 



(3) The area of contact with the forewing or its bristles. 



(4) The bristles developed along the border of that area. 

 In the case under discussion, i.e., when the two areas of con- 

 tact are located at the bases of the wings, we may name the 

 parts as follows : — 



(1) The area of contact of the forewing with the hind, in so 

 far as it projects beyond the general contour of the posterior 

 border, may conveniently be termed the jnyal Johe, a term I have 

 already employed in the paper mentioned abo\e(l2). A special- 

 ised form of this area, in which it becomes an elongated, narrow 

 process passing hplouo the costa of the hind wing, is termed the 

 juyum, this being the term fii'st applied to such a process by 

 Com stock in the Lepidoptera(l). 



(2) The bristles projecting from this area towards the hind- 

 wing may be called the jnya/ hristlpg. 



(3) The area of contact of the hindwing with the fore, in so 

 far as it projects beyond the general contour of the anterior or 

 costal border, may be termed the humeral lobe. I had previously 

 employed the term jnyal jji-oce.s.<i for this area in the Planipennia 

 (12). But I now consider that this term is open to objection; as 



