A REVISION OF THE GENUS CLIDICUS. 17 



(3. thorax minor, subglobosus , basin versus distincte 

 angustior (sed baud transversus ut in Cl. for- 

 micario)^ minus convexus , postice obliquus (binten 

 scbrag abfallend) : 



Var.? Ganglbaueri Rttr. ') 

 B. Capite postice baud bilobato , ideoque rotundato. 



Antennae longissimae, corporis longitudine, art. 3° 

 duplo longiore 2°, 3 — 10 elongato-conicis, sensim 

 brevioribus; palpi maxillares articulo ultimo latitu- 

 dine triplo longiore, modice iuflato. Caput in fronte 

 linea longitudinali impressa, baud sulcatum, in 

 vertice late profundeque foveolatum. Tborax oblongo- 

 ovalis (latitudine distincte longior) , elytra striis pro- 

 funde impressis , punctis striarum parvis , interstitiis 

 striarum convexis. Pedes longissimi. Piceus vel piceo- 

 testaceus. 7 — 1\ mm. Borneo. In Mus. Civico Ge- 

 nuensi et Mus. Imperiali Vindobonensi : 



tapbrocepbalus Gestro. 

 {grandis Rttr. nee Casteln.). 



The babits of tbis remarkable genus of Scydmaenidae 

 are but very imperfectly known. Tbe myrmecoid form of 

 the body alone vrould not allow us to declare tbis genus 

 myrmecophilous, as the general » habitus" of all Scydmae- 

 nidae has something of an » ant-form", wherefore Muller 

 and Kunze in their Monograph of Scydmaenidae ^) simply 

 called the whole family » ant-beetles" (Ameisenkafer). But 

 only a few genera, as Chevrolatia, Euthiconnus and Napo- 

 chus , are regularly living in the society of ants , in their 

 nests or in the immediate vicinity, and are therefore regu- 



1) There are some transitions between these two forms of a and /3 among 

 the CI. grandis of the Leyden Museum. Among the 13 Cl. formicarius of the 

 various collections I find no similar difference in the size and form of the 

 thorax; this seems to insinuate, that the noted difference in grandis is not 

 a sexual one. On the other hand the grandis with the larger thorax have also 

 a larger head, what might be supposed a sexual character. 



2) Monographic der Ameisenkafer (Schriften d. Naturforsch. Gesellsch. Leip- 

 zig, I, 1822). 



P^otes from the Leyden ZMusenm, "Vol. XVIII. 



2* 



