4S 
THE ORDER OF OOLEOPTERA. 
1 . Anterior and middle tarsi of the males with the four first joints 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 ofton inclining to brown ANISODACTYLUS, 37. 
B B. Tarsi of both sexes dilated ; first joint much larger than the others ; size small ; color 
mostly black Gykandbofub, 2. 
A A. The dilated joints scaly beneath. 
C. Menturo usually with a small median tooth ; thorax sub- quadrate ; tarsi not bilobod; size 
usually about medium ; color black, rarely dark brown or green HakpalTJB, 54. 
C C. Meutura without tooth ; thorax rounded ; the last of the dilated joints deeply bilobed ; 
size small; color usually wholly or in part light reddish-brown Stknolopiius, 24. 
2. Anterior tarsi of males with four dilated joints, which are scaly beneath ; middle tarsi not dilated ; 
mentum toothed ; size and color like Stonoloplius ; thorax somewhat square-shap<*d : 
Buadycellus, 26. 
3. 
4. 
5 . 
Anterior tarsi of the males with the three first joints dilated and scaly beneath; middle tarsi 
not dilated ; size about medium or below. 
D. Anterior tibue rather stout and thickened at the tip. 
E. Body more or less elongated; thorax narrower at base than elytra; size various; 
color mostly pure black PterOstichus, 89. 
E E. Body elliptical ; thorax nearly as wide at base as elytra ; three first joints of anten- 
niu carinated ; size medium ; colors metallic PtEClLUS, 13. 
E E E. Body oval; thorax wider than long, and as wide at base as elytra; head small; 
color black or blackish Ah Ait A, 38. 
D P. Anterior tibiic slender and scarcely thickened at the tip. 
F. Claws pectinate ; tibi® strongly spinous Calathus, 11. 
F F. Claws simple ; tibia* not strongly spinous ; size usually below medium ; often 
with metallic tints PLATYNU9, 96. 
Anterior tarsi of males with the two first joints dilated, aud scaly beneath. 
G. Palpi not acuminate; thorax heart-shaped; size medium or below; color almost 
always shining black PATROBUS, 14. 
G G. Palpi ending in a long pointed joint; thorax various ; size small ; color usually 
light brown TuECitUB, 6. 
Rone of the tarsi dilated; head rather broad and not narrowed behind the eyes ; size various; 
color brownish. 
H. Anterior tibi® abruptly widened at the extremity ; size large Geopinus, 1. 
H H. Anterior tibi® normal ; size small Agonobbrub, 10. 
Anisodactylus baltimoriensis , Say, nearly half an inch long, with red- 
dish-brown elytra, and pale legs, is a very common insect, and is often 
seen flying in considerable numbers in the first Lot days of spring. \\ e 
have a considerable number of small, active, shining light-brown Cara- 
bid®, generally less than a quarter of an inch in length, which belong 
mostly to the three genera, Stenoloplius , Bradycellus aud Trechus. The 
second are distinguished from the first, in addition to the structure ot 
the feet of the males, by the thorax having distinct angles behind, whilst 
it is rounded in Stemlophus, The distinctive character of Trechus is the 
form of the palpi, the last joint being elongate, conical and pointed, and 
the joint before it being somewhat similar, but reversed, so that the two 
taken together form a fusiform or spindle-shaped body. Pterostichus, 
ltonelli, 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 Oodes in the preceding sub- 
family. The males are distinguished by the structure of their feet, but 
