172 



THE SCOLYTID BEETLES. 



same sex of the species of a well-defined genus is exceedingly rare. 

 Therefore, an odd number of joints in examples of the dominating 

 sex either indicates an abnormal development or a different genus. 

 If abnormalities occur, they may be easily detected by the combina- 

 tion of other generic characters. The number of joints in the anten- 

 nal funicle of the scolytoid beetles is limited to seven, and there is 



probably no normal 

 exception to this in 

 the superfamily, and 

 probably not in the 

 entire Rhynchophora, 

 or, if so, it will be ex- 

 ceedingly rare. 



According to the 

 number of joints in the 

 funicle, the 221 gen- 

 era, including many 

 new ones, are distrib- 

 uted as follows: 



Table II. — Funicular 

 joints in the superfamily 

 Scolytoideafl 



1 joint in 3 genera rep- 

 resenting 1 subfamily. 



2 joints in 6 genera rep- 

 resenting 2 subfamilies. 



3 joints in 13 genera rep- 

 resenting 4 subfamilies. 



4 joints in 44 genera rep- 

 resenting 7 subfamilies. 



5 joints in 73 genera rep- 

 resenting 9 subfamilies. 



6 joints in 31 genera rep- 

 resenting 9 subfamilies. 



7 joints in 51 genera rep- 

 resenting 9 subfamilies. 



Total, 221 genera repre- 

 senting: 16 subfamilies. 



Fig. 96. — The antenna in scolytoid beetles: Diagram and terminology. 

 Scrobe: a, Fossa. Scape: b. Condyle; c, basal section or neck; d, elbow; 

 e, median section; f, apical section; fa, dorsal fringe; g, apical fossa; ga, 

 apical margia. Funicle: h, Base or condyle; i, basal section; j, me- 

 dian section; k, apical section; ka, apical angle; fc6, dorsal lobe; I, 

 ventral angles of joints; m, dorsal angles; ma, funicular fringe or 

 dorsal bristles; n, apical jotat. Clvb: o, Basal annulation; p, apical 

 or sutural annulation of joint 1; q, ventral septum or single septum; 

 r, dorsal and ventral septa or double septa; s, chitinous suture; t, 

 ventral fringe; to, ventral bristle; tb, procumbent bristle; tc, re- 

 cumbent bristle; u, setaceous annulation or sutural annulation; v, 

 sensitive pores; iv, sensitive and setal granules; wa, sensitive area; 

 wb, chitinous area. Clvb: A, solid; B, annulated; C, conical; D, 

 separated joints or sublamellate; F, compressed; F, thickened at 

 base; G, obliquely ti-uncate; H, antemia extending at right angles 

 to the head. (Original.) 



Among eight genera 

 of doubtful position 

 the number of joints 

 in the funicle is not given in the description of one genus. Three 

 genera have 5, one has 6, and three have 7 joints. 



Within the subfamilies the progressive modification in generic 

 characters and characteristics appears to be associated with the 



"This table includes eleven recently described genera which have been provi- 

 sionally referred to subfamilies. 



