48 THE ORDER OF COLEOPTERA. 



1. Anterior aud iiiidille tarsi of the males with the four lirst joiuts dilated. 

 A. The dilated joints brush-like beneath. 



B. Tarsi of the males only dilated; first joint not larger than the others ; size never much below 



medium ; color often inclining to brown Anisodactylus, 37. 



B B. Tarsi of both sexes dilated ; first joiut much larger than the others ; size small ; color 



mostly black Gynanduopus, 2. 



A A. The dilated joints scaly beneath. 



C. Mentum usually with a small median tooth ; thorax sub-quadrate ; tarsi not bilobed; size 



usually about medium ; color black, rarely dark brown or green Harpalus, 54. 



C C. Mentum without tooth ; thorax rounded ; the last of the dilated joints deeply bilobed ; 

 size small; color usually wholly or in part light reddish-brown Stexolophus, 'J4. 



2. Anterior tarsi of males with four dilated joints, which are scaly beneath ; middle tarsi not dilated ; 



mentum toothed ; size and color like Stenolophus ; thorax somewhat square-shaped : 



Buauyceli-us, 26. 



3. Anterior tarsi of the males with the three first joints dilated and scalj' beneath; middle tarsi 



not dilated ; size about medium or below. 

 D. Anterior tibiiie rather stout and thickened at the tip. 

 E. Body moie or less elongated ; thorax narrower at base than elytra ; size various ; 



color mostly pure black Pteuostichus, 89. 



E E. Body elliptical; thorax nearly as wide at base as elj"tra; three first joints of anten- 

 na- cariuated ; size medium ; colors metallic Pcecilus, 13. 



E E E. Body oval ; thorax wider than long, and as wide at base as elytia ; head small ; 



color black or blackish A jiaka, 38. 



D D. Anterior tibi* slender and scarcely thickened at the tip. 



P. Claws pectinate ; tibia; strongly spinous Calathus, 11. 



E E. Claws simple ; tibiiu not strongly spinous ; size usually below medium ; often 

 with metallic tints Platynus, OG. 



4. Anterior tarsi of males with the two first joints dilated, and scaly beneath. 



G. Palpi uot acuminate; thorax heart-shaped; size medium or below; color almost 



always shining black Patrobus, 14. 



6 G. Palpi ending in a long pointed joint; thorax various ; size small ; color usually 

 light brown TllECliUS, 6. 



5. None of the tarsi dilated ; head rather broad and not narrowed behind the eyes ; size various ; 



color browuish. 



H. Anterior tibiae abruptly widened at the extremity ; size large Geopixus, 1. 



H H. Anterior tibiai normal ; size small Agonoderus, 10. 



Anisodactylns haltimorieiisis, Say, nearly half an inch loug, with red- 

 dish-brown elytra, and pale legs, is a very common insect, and is often 

 seen Hying in considerable numbers in the first hot days of spring. We 

 have a considerable number of small, activ^e, shining light-brown Cara- 

 bidjB, generally less than a quarter of an inch in length, which belong- 

 mostly to the three genera, Stenolophus, Bradycellus and Trechus. The 

 second are distinguished from the first, in addition to the structure of 

 the feet of the males, by the thorax having distinct angles behind, whilst 

 it is rounded in Stenoloplms. The distinctive character of Trechus is the 

 form of the palpi, tlie last joint being elongate, conical and pointed, and 

 the joiut before it being somewhat similar, but reversed, so that the two 

 taken together form a fusiform or spindle-shaped body. Pterostichus, 

 Bonelli, is now substituted for Feronia, Latreille, on account of the lat- 

 ter term having been previously used in botany. It contains a vast 

 assemblage of species which have been divided into various sub-genera, 

 but without any fixed distinctive characters. We have already spoken 

 of the close resemblance between Amara and Oodcs in the preceding sub- 

 family. The males are distinguished by the structure of their feet, but 



