588 Descriptive Catalogue [1896. 



basal one, the latter much inflexed in the centre towards the dis- 

 coidal part which is slightly raised, in the outer part a long seta 

 equidistant from the apex and the middle and another at the 

 posterior angle ; elytra oblong, smooth, striate, with the lateral striae 

 often hardly defined or entirely absent, second interval ^^ith an 

 apical setigerous puncture, the third one with a subbasal and a 

 median puncture, the supra-marginal one either well defined or not, 

 with a deep setigerous puncture at about two-thirds of the length, 

 and the fifth one always curving outwardly at the apex ; legs 

 moderately slender, the two basal joints of the anterior tarsi of the 

 male dilated a little more inwardly than outwardly, the basal one 

 longer and a little broader than the second. 



Hah. Trechus is found in Europe, the Canary Islands, Northern 

 and Southern America, and India. 



Synopsis of Species. 

 Anterior tibise not truncate diagonally externally. 



Elytra with three dorsal striae on each side, the outer one not 

 sinuate attcrrimus. 



Elytra with three dorsal stride on each side, the third stria 

 sinuate apically amhiguus. 



Anterior tibiae diagonally truncate externally at the apex. 



Elytra with five dorsal striae on each side iKillipcs. 



Elytra with six striae rufiiJes. 



Elytra with seven striae, the two outer ones uniting at about 



three-fourths of the length vivax. 



Elytra with seven striae, the two outer ones not united at the 



apex affinis. 



Trechus ateeeimus. 



Black, shining ; palpi infuscate and tarsi pale flavescent ; longi- 

 tudinal grooves of the head and supra-orbital puncture very con- 

 spicuous ; basal joint of antennae reddish, the others black ; 

 prothorax cordiform, longer than broad ; elytra elongate, parallel, 

 broader than the prothorax at the base by nearly one-third ; smooth 

 and having on each side three discoidal striae, not sinuate at tip, 

 the outer one is the shortest of the three, and three punctui'es on 

 the third interval, the first one is at the top of the third stria, and 

 the median and posterior one in the centre of the interval, the first 

 and second striae do not reach further than the supra- apical puncttu'e. 

 Length 3-1 mm. ; width 2 mm. 



Easily recognised from the other South African species on account 

 of its more slender facies, which is not unlike that of a small 

 Ahacetus. 



Hah. Cape Colony (Cape Town). 



