120 



posticos impresso, his minutis subdentiformibus, lobo basali 

 latissimo valde elongate ; elytris striis singulis subsuturali- 

 bus et marginalibus profunde impressis (illis antice abbre- 

 viatis), alibi nullo modo striatis, sulco profundo transverse 

 discoidali paullo pone basin instructis, ante hunc sulcum 

 gibbosis, punctura magna discoidali mox pone medium 

 aliaque minore anteapicali impressis ; tarsis minus elongatis. 

 Long., U 1.; lat, | 1. 

 This extraordinary little insect is certainly I think allied to 

 T. secalioides, Blackb., though it is quite possible that the dis- 

 covery of additional species may result in its being convenient 

 to separate it generically under a new name. The two seem 

 rightly associated as a distinct group of Trechides having the 

 palpi of Perileptus (like those of Bembidium except that the 

 apical joint is greatly elongated), but with the convex form of a 

 Bembidium and the elytra brilliantly nitid and (except the very 

 deep subsutural and marginal strise) without a trace of striation. 

 In the present species the large anterior discal elytral puncture 

 of secalioides is replaced by a deep transverse sulcus in front of 

 which the elytra are gibbous. The possibly generic distinctive 

 characters of this species as compared with secalioides consist in 

 its evidently shorter tarsi (especially the hind pair) and antennae, 

 the excessively fine marginal edging of its prothorax and the 

 curious basal lobe of the latter, the lateral outline of which so 

 nearly continues the outline of the true lateral margin of the 

 segment that to a casual inspection the hind angles appear as 

 small denticulations of the margin placed at a distance from the 

 base equal to about a quarter of the length of the whole segment. 

 The superficial characters of this insect are so remarkable that 

 there can be no difiiculty in recognising it whatever may be 

 thought of its generic position. 



Tasmania (on a mountain in the Lake District). 



TACHYS. 



Mr. Sloane (Proc. L.S., N.S.W., 1896, III.) has furnished a 

 very valuable memoir " on the Australian Bembidiides referable 

 to Tachys,'' kc. Tachys is a genus particularly difficult to define 

 as no one character can be specified distinguishing it from 

 Bembidium. Lacordaire makes it a section of Bembidium. 

 Dr. Schaum treats it as a good genus and limits it to species^ 

 having both a recurved elytral striole and anterior tibiae obliquely 

 truncate at the apex. There exist numerous species in which it 

 is difficult to say whether there is a true elytral striole, — that 

 character being either very faint or the striole being confused 

 with one of the systematic striae. The absence of the striole is 

 *in some species accompanied by the presence of the tibial charac- 



