88 



THE YOUNG NATURALIST. 



Amara is broader, the thorax is more 

 rounded at the sides, the legs are short, and 

 the colour generally bronze. 



Thorax narrower at the base than the 

 elytra : 



1. Elytra brilliant green, or green with a 

 yellow border ; or bright coppery ; 

 or black with long yellow hairs. 



Elytra hairy and rough ChlcBnius. 



Elytra smooth and hairless. 



Posterior angles of the thorax rounded 



. .Anclwmenus (part). 

 Posterior angles distinct .... 



Pterostichus ^part). 



2. Elytra blue black PristonycTius 



3. Elytra bronze or greenish bronze .... 



An ohomenus (part), Olisthopus and 

 Amara (part.) 

 In Amara the posterior angles of the 

 thorax are more or less distinct in this 

 group of the genus Anchomenus and in Olis- 

 tho^pus they are rounded. The points 

 of difference between the latter will be 

 given afterwards. 



4. Elytra red at base, and blue or green 

 at apex Anchomenus prasinus. 



5. Elytra dark or reddish. 



a. About one inch in length ; the elytra 



with indistinct striae SpTwdrus. 



&. Under f inch in length, or if over, 

 with distinct striae. 

 I. Anterior tibiae slender, scarcely 

 thickened at the apex. 

 Calathus piceus ; TapTirice, and 

 part of Anchomenus. 

 Hinder pairs of tarsi furrrowed . . Calathus. 

 Apical joint of labial palpi hatchet-shaped. . 



Taphria. 



Apical joint of palpi cylindrical . . 



Anchomenus. 



2. Anterior tibiae thickened very dis- 

 tinctly at the apex . . Stomis, Platy- 

 detus, Pterostichus (part), and Amara 

 (partj. 



Stomis is at once recognised by its long, 

 very prominent mandibles. 



Platyderus by its reddish thorax and elytra, 

 the sides ofthe latter being nearly straight. 



Pterostichus is generally narrower, the 

 upper side chiefly shining black, and the 

 third interstice of the elytra with one or 

 more impressions, 



Amara is generally broader, the prevailing 

 colour being pitchy black or bronze brown ; 

 the third interstice of the elytra is without 

 impressions. 



Group B. 



A. Size, under \ inch . . Trechidce (see after). 



B. Size, \ inch or more. 



1. Last joint of palpi hatched-shaped. 



Elytra black Liciaus. 



Elytra spotted or marked with red .... 



PanagcBUS, 



2. Last joint of palpi not hatchet-shaped. 

 Thorax longer than broad, narrowed 



behind Patrohus. 



Thorax not longer than broad, and 

 scarcely narrowed behind . . Pogonus. 



[Erratum. — On page 53, the figures 5 and 7 

 of the woodcut require reversing ; fig. 5 

 should be fig. 7, and fig. 7 should be 

 fig. 7-] 



THE "YOUNG NATURALIST" 

 ILLUSTRATED CATALOGUE 

 OF BRITISH INSECTS. 



Plate IV. 



Our plate of this series this month repre- 

 sents eight series of a little well-known 

 order — the Trichoptera. This is an order 

 of insects which some of our young entomo- 

 logists should take up, as many species, no 

 doubt, await discovery. In this order we 

 purpose giving samples of the neuration of 

 the wings of each genus, as this is an impor- 

 tant distinction. At some future time we 

 may give a series of papers on this order, 



