39R DR. J. B. HICKS ON THE ORGANS 



M. Antenna of lurva 0/ Colymbetes striatus. 

 Fig. 1 . Terminal joints. 



a. Spine or hair. 



b. Apex with three hairs. 



Fig. 2. Enlarged view of A (fig. 1), showing the nerve. 

 Fig. .S. Enlarged view of « (fig. 1). 



N. Antenna o/Myrmica rubra. 



Fig. 1 . l^he terminal and next segment, showing — 



aa aa. Organs as in other insects ; 



h b b. Smaller, communicating with the tubes, as in fig. 2. 

 Fig. 2. Shows the elongated tubes with expanded extremities, proceeding from bh h (fig. 1). 

 Fig. .3. Section of antenna-wall. 



a a. The larger and more usual form. Diameter 2^y_ of an inch ; length from -^^j^ to jj~, o 

 an inch. 



b b. Diameter ^^^^ of an inch. 

 Fig. 4. Another form of o a (fig. 3). 



O. Antenna of Pronoeus inetabilis. 

 Fig. 1. Portion of antenna. 



Fig. 2. Section of antenna-wall, showing structure of a a a (fig. 1). Diameter jt^^^ of an inch. 

 Fig. .3. Section of antenna-wall. 



r c. Shows section of fig. 1 c c. 1 _^. , ,. . , 



. , .,, . fc , , , miameter ^^ ot an mch. 



c 0. Shows section 01 ng. loo. J 



d d. Shows section of fig. 1 d d. Diameter -^-^ of an inch. 



P. Antenna of Sirex gigas. 

 Fig. 1. One segment, showing two kinds of organs : — 



a. With elevated closing-in membrane (see P. fig. 4). Diameter j-pTrrr of an inch. 



b. Cup-shaped membrane (see fig. 2 and fig. 3S). Diameter T,jj-n of an inch. 

 Fig. 2. Section .showing the cup-shaped organs. 



Fig. 3. Superficial view. 



Fig. 4. Section of antenna-wall through fig. 1 a d, fig. 3 a. 



Q. Antenna o/Arctia Caja. 

 Fig. 1. One segment of male antenna. The organs are chiefly on the extremity of the lateral pecten, 



scales being on the opposite aspect. 

 Fig. 2. Segments of female antenna. Organs on serrated aspect. 



Fig. 3. Magnified apex of serrae, with organs. The dotted lines represent the interior condition. 

 Fig. 4. Apex of club-headed pecten of Odonestls potatoria. 



a a. Organs, b b. Hairs. 

 Fig. 5. Enlarged view of an organ (a) and hair [b), with the cuticular lines. 



R. Antenna o/"Tryphaena Bomba. 



Fig. 1. External aspect of a segment. (All are alike.) 



a. Scales on one side. 



b b. Organs on opposite side, with small hairs between. 

 Fig. 2. Longitudinal section of ditto, showing nerve : a and b. lobulated matter beneath organs. 

 Fig. 3. Enlarged view of organs, a a. Organs, Between are hairs and cuticular markings. 



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