714 APPENDIX. 



NEW CLASSIFICATION OF THE HEMIPTERA. Prof. Schiodte 

 has proposed the following classification of the Hemiptera, 

 which is probably the best yet suggested, and is based on a 

 more profound study of their external anatomy than has been 

 previously made. It will be noticed, however, that the lice 

 (Pediculina) are not included, though he regards them as 

 forming a separate division (Siphunciilata Latr.) of equal value 

 with the Heteroptera and Homoptera. He does not seem to 

 include the Mallophaga among the Hemiptera. The families 

 of the Homoptera are not characterized. 



I. Genre (checks) hollowed out, to receive the first pair of COXIE. 

 [Posterior pair of coxse hinged, provided with femoral grooves.] 



Suborder HOMOPTERA. 



II. Genae entire, remote from the coxa;. 



Suborder HETEROPTERA. 

 A Posterior coxae acctabulate, rotating, with no femoral grooves. TrochaJopoda. 



a. Metathoracic epimera laminate, nearly concealing the first ventral segment 



[of the abdomen. 



1. Antennae covered at the base. Fam. 1. Cimices. 



2. Antennae entirely uncovered. 



*. Antennse inserted before the eyes. Fam. 2. Corel. 

 **. Antennse inserted below the eyes. Fam. 3 Lygcci. 



b. Metathoracic epimera without the ventral lamina. [metrce. 



1. Claws superposed (inserted before the end of the joint). Fam. 4. Hydro- 



2. Claws terminal. 



*. Metathoracic epimera almost covered by the mesothoracic epimera. 



Last pair of abdominal spiracles forming a short tube. Fam. 5. Nepce. 



**. Metathoracic epimera wholly uncovered. Abdominal spiracles equal. 



[Fam. 6. Keduvii. 



B. Posterior coxae hinged, provided with femoral grooves. Pagiopoda. 

 a. Antennas uncovered. Fam. 7. Acanthus. 

 b Antennae partially covered. 



1. Body depressed, prone, 

 o. Beak free. 



f. Metathoracic epimera uncovered. 

 *. Feet cursorial. Fam. 8. Pelegoni. 

 **. Feet natatory. Fam. 9. Naucorides. 



tf. Mesothoracic epimera almost covered by the metathoracic epimera. 



[Fam. 10. Ilelostomata. 



0. Beak free. [Metathoracic epimera uncovered, appendiculated.] Fam. 



[11. Corixce. 



2. Body boat-shaped, supinate. [Metathoracic epimera uncovered. Beak 



free.] Fam. 12. Notonecta. 



NEW CLASSIFICATION OF THE SPIDERS. The arrangement 

 of the groups of spiders given by me is very imperfect. I 

 therefore present the following classification of Dr. T. Thorell 

 (On European Spiders. Part I, 1869-70) as the most satisfac- 

 tory. While I have considered the Araneina as forming a sub- 



