CHAP, xx.] EXTRA ANTENNAE ARISING TOGETHER. 515 



These two antennas curve in opposite directions and are in 

 all respects complementary to each other, forming a trne pair. 

 The most anterior of them, r, is disposed as a rir/lit antenna, 

 while the posterior, I, is disposed as a left. This specimen 

 was taken by M. Albert Mocquerys, and was kindly lent to me 

 by M. Henri Gadeau de Kerville. 



789. Melolontha vulgaris $ (Lamellicorn): left antenna bearing a 

 pair of supernumerary clubs. The extra pair arises from the second 

 joint of the normal antenna, and they have their third joints united at 

 the base. The relative positions of the extra clubs and the normal one 

 are those marked VP in the Scheme. All these three clubs are perfect 

 and of the same size, but each is a little smaller than a normal club. 

 At the thoughtful suggestion of Prof. Howes this specimen was 

 very kindly lent to me by Mr E. E. Green, and has been placed in the 

 Museum of the Royal College of Surgeons. 



790. Melolontha vulgaris : L r in r ht antenna bearing a supernumerary 

 pair of clubs in Position P. For details see original, where a different 

 and I think untenable view is taken] LEREBOULLET, Rev. et May. de 

 ZooL, S. -2, in., l8ol,X'A 



791. Melolontha vulgaris , with a pair of supernumerary antenna? 

 arising from the left antenna. [The figure shews that the proximal joint 

 or scape was of abnormal thickness and had two peripheral articulations 

 in the same horizontal plane. The anterior articulation bore a normal 

 antenna. The posterior articulation bore a single large first funicular 

 (2nd) joint which in its turn bore a pair of clubs in the same horizontal 

 plane, the anterior being a right club and the posterior a left, having 

 their anterior surfaces adjacent : they are therefore a complementary 

 pair in Position P.] KRAATZ, G., Dent. ent. Zt., 1880, xxiv. p. 3-il, 

 figs. 7 and 7 a. 



792. Amphimallus solstitialis (Lamellicorn): left antenna bearing a 

 supernumerary pair of imperfect antenna? articulating by a common 

 stalk 011 the anterior surface of the second joint. The two extra clubs 

 are an imperfect pair, complementary to each other, being set on back 

 to back, in Position A. The most anterior of the clubs has only two 

 lamellar joints, one small and one large. The posterior has three 

 lamellse. The normal club has three lamelhe as usual. Originally 

 described by MOCQUERYS, /. c., p. 15,y?Vy. 



793. Anomala junii (Lamellicorn) : left antenna bears 3 clubs, each having 3-jointed 

 stem articulating with elongated 2nd joint of antenna. [Symmetry nut clear: 

 possibly Position DPI'.] KUAATX, Dent. cut. Zt., 1881, xxv. p. Ill, PI. m. rig. 4. 



*794. Geotrupes typhaeus (Lamellicoru) : left antenna bearing 

 a pair of supernumerary clubs compounded together. The an- 

 tenna is normal up to the 7th joint which is dilated. The 8th is 

 still more dilated and bears posteriorly the normal club com- 

 posed of three lamella?; and anteriorly by a separate articulation 

 a supernumerary structure (Fig. 174, inr,ml) consisting of three 

 joints, each of which has the form of a complementary pair of 

 lamellae joined by their morphologically posterior (sc. external) 

 edges. The whole supernumerary structure is thus morphologic- 



332 



