APPENDIX I. 



The following pages give, in brief, such corrections or addi- 

 tions as seem necessary to place the text iu full accord with the 

 latest works which have reached us: — 



Page 72. — The genus Philhydrus has been divided by Dr. 

 Sharp (Biol. Cent. Amer. Coleoptera, i. pt. 2, pp. GG et seq.) into 

 a number of genera, of which two occur in our fauna: Philhy- 

 drus, in which the mesosternum has a longitudinal carina, and 

 the middle and hind tarsi 5-jointed, Hydrocombus, with the meso- 

 sternum at most slightly transversely carinate, and the middle and 

 hind tarsi 4-jointed. The latter genus contains those species 

 placed in the division Helochares by Dr. Horn (Proc. Amer. 

 Philos. Soc. xiii., 1873, p. 130). Helochares proper has not yet 

 been recognized in our fauna. 



Berosus altus Lee. and one Mexican species form the genus 

 Derallus Sharp (loc. cit., p. 77), which differs from Berosus in 

 having the front tibite broader to tip and not slender. 



Page 73. — Cyclonotum estriatum 5'a^ forms the type of Phee- 

 vonotum Sharp (loc. cit., p. 07). In Cyclonotum the intercoxal 

 carina is formed entirely by the mesosternum, in Phoenonotuni 

 the metasternum is prolonged in front of the middle coxai. Proba- 

 bly other species will enter this genus. 



Page 165. — The name Helichus must be rejjlaced by Dryops. 

 Dr. Sharp states that the characters given by Ericlison for the 

 separation of these genera do not exist {vide Biol. Cent Amer. 

 Coleoptera, i. pi. 2, p. 119). 



Page 193. — The genera of Throscida^ indicate two tribes, the 

 Lissomiiii, represented in our fauna by Draj)etes, and Throscini 

 by Throscus and Pactopus. As the tribal names are used in the 

 tables (pp xxxii., xxxiv.), they are mentioned here to explain 

 their absence on p. 193, the small number of genera not seeming 

 to require tribal division. 



(533) 



