LECONTE— SYNOPSIS OF PTEROSTICHUS. 227 



are transitional forms. The posterior tibiae are finely and sparsely ciliate with bristles 

 and sometimes almost smooth in Evarthrus, Ptcrostichus, Lophoglossus and Ilolcio- 

 phorus; they are strongly spinous in Loxandrus and Poecilus. The posterior and 

 intermediate tarsi have on the outer margin two grooves with an intermediate ridcre 

 extending usually to the third joint. This is wanting in Evarthrus, Holciophorus, 

 Lophoglossus and a few species of Pterostichus. 



The three first joints of the anterior tarsi of the male are dilated, and furnished 

 beneath vt'ith a double series of papillae : the dilated joints are oblique in Loxandrus ; 

 transverse and not emarginate in Evarthrus: obcordate, sometimes transverse, but 

 more or less emarginate in the other genera. The intermediate tibiae are emarginate 

 near the apex on the inner surface and armed with two teeth in the males of Lopho- 

 glossus. The posterior tibiae are serrate internally along their whole extent in Hol- 

 ciophorus, and slightly curved inwards in Loxandrus. The last ventral segment is 

 sculptured in various ways in the males of many Pterostichus and Holciophorus : it 

 is simple in the others. 



There is but a single anal puncture each side in both sexes of Evarthrus, except 

 in E. mancus, where the female has two : there are two in the females and one in the 

 males of most Pterostichi : there are, however, two in both sexes of P. Isabellae and 

 P. illustris. 



Evarthrus Lee. 



Antennae articulis basalibus simplicibus : labrum vix emirginatum: ligula convexa, apice rotundata, 

 subtruncata, paraglossis linearibus, earn paulo superantibus ; palpi articulo subcylindrico; parapleurae breves; 

 elytra unipunctata, stria scutellari vel brevi, vel distincta ; tarsi posteriores extus non sulcati; tarsi maris 

 antici articulis tribus dilatatis triangularibus prascipue transversis non emarginatis. 



Besides the characters given above, the first joint of the abdomen, except in the last 

 species, is marked on each side with a deep transverse line, appearing like a suture. 

 The anal punctures are single in each sex, except in the last species : the last ventral 

 segment of the male is usually without impressions; in the first four species it has 

 two faint impressions separated by a longitudinal elevation. In E. con viva, it has a 

 single impression. In E. mancus there is a small transverse tubercle near the apex. 



The dorsal puncture is always situated on the third stria just behind the middle. 

 When by a monstrosity, the puncture becomes double, the second is always close to 

 the normal one. The pectus and venter are never punctured : all are without wings. 



According to the form of the thorax and position of the ninth stria of the elytra we 

 may divide the species as follows : 



1. Striis marginalibus valde approximatis. 



a. Tborace quadrate, postice utrinque biimpresso. ...*... Sp. 1 5. 



b. Thorace cordato, postice biimpresso. . . gp. 6 8. 



c. Thorace rotundato-cordato, postice unistriato. ....... Sp. 9 12. 



