22 GEO. H. HORN, M. D. 



As a sexiKil character of minor importance the anal sette have 

 some value. In some species the male will have one seta on each 

 side and the females two, in other cases both sexes have two setse. 



In presenting this essay a little indulgence must be demanded. 

 The group is one of the most difficult of the Carabide series, and can 

 be properly studied by series of specimens and not by uniques, ex- 

 cept they be typically selected. I must at this time again express 

 my thanks to Mr. Ulke for kindly placing his entire material at my 

 disposal, thereby more than doubling the number of individual 

 specimens studied. 



In accordance with the views expressed in the preceding pages, 

 and by subordinating the characters in the manner indicated, it is 

 proposed to divide our species into groups in the following manner: 



Mentum tooth more or less einarginate at tip (s. g. Celia) 2. 



Men turn tooth entire (s. g. Acrodon) 8. 



2. — Antennpe and legs piceons-black , Group erratica. 



Antennae pale, legs usually so 3. 



3. — Prosternum plurisetose at tip: prosternuni of male not punctate (s. g. Per- 



cosia) Group obesa. 



Prosternum either bisetose at tip or plain 4. 



4. — Prosternum 6f male with a group of small punctures or with a punctate 



fovea 5. 



Prosternum of male smooth, as in the female 7. 



5. — Prosternum of male with a rather large, but shallow fovea: sides of thorax 



not deplanate: tip of prosternum without setae Group californica. 



Prosternum of male with an irregular group of small punctures (i. 



fi. — Prosternum bisetose at tip; sides of prothorax distinctly deplanate. 



Group remotestriata. 

 Prosternum without setae : sides of prothorax not deplanate. ..Group g-ibba. 

 7. — Prosternum without setae; sides of prothorax not deplanate. 



Group musculus. 

 8. — Prosternum of male smooth, the tip not setose; sides of prothorax not de- 

 planate Group brunnea. 



Group erratica. 



Antennse pitchy-black, usually entirely so, often with the two basal 

 joints rufescent. Legs piceous, or nearly black. 



Thi.< group is the equivalent of the third, as defined by Zimmer- 

 mann, and accepted in the various memoirs of subsequent authors. 

 The two characters above given are the only ones peculiar to it. 

 The head is smooth, the front very feebly impressed. Third joint 

 of antenna compresso-carinate at base. Thorax slightly emarginate 

 in front, basal region not punctate, hind angles rectangular, but less 

 sharply in erratica, the sides are not depressed. The elytral strias 



