1916.) 195 



The aedeag-us is rather narrow and parallel, with slender median and rather 

 broad lateral lobes (fig-. 65). 



A. glacialis is an alpine insect, found at the edges of snowfields 

 on high mountain ranges from Scandinavia to the Sierra Nevada, and 

 Corsica, and is extremely abundant in its haunts. It is a very variable 

 species, but does not form local races as one would expect it to do on 

 account of the great isolation of its colonies. Kuv^ert made a Cau- 

 casian variety (caucasicus) , which he later treated as a different species 

 under the name of guttulus Motsch. I have not seen this form. 



This species has not yet been found in Britain, but may perhaps 

 be detected at the snowfields on our highest mountains when the snow 

 is disappearing in June. 



4. — Atradlielo'phorus fanstimms, sp. n. 



Parvus, nigcr, supra aeneomicans, antemiis, xtalpis ];)edihusq^lcJ\l,scis,femorih^ls 

 nigricantihus ; parum convexus, prothoracc suhtiliter punctato ; elytris ante 

 Tnedium impressis, sat fortiter punctato-striatis, interstitiis haud convexis. Long. 

 vix 2\ mm. 



Hah. : Alp. Caucasus. 



A single specimen, fortunately a male, is indicated by the aedeagus as cer- 

 tainly a distinct species, perhaps most allied to glacialis, especially to the small 

 individuals from the Guadarrama and the the Lago della Maddalena. Legs and 

 tarsi short and feeble. Channel of vertex very fine, eyes rather small. Thorax 

 with the sides straight but convergent behind, the grooves not deep, the median 

 intervals finely punctate, not polished. Aedeagus (fig. 66). 



Distinguished from the smallest and most slender forms of 

 A. hrevvpaJpis not only by the colour, but by the finer sculpture, as 

 Xvell as by the peculiarities of the aedeagus. 



A single specimen sent me by the late J. Faust of Libau, the only 

 locality given being Alps of the Caucasus. 



5. — Atracthelophorus rivalis Giraud. 



Dark in colour, the elytra being fuscous-brown or piceous, without macii- 

 lation ; the thorax black with but little metallic refiection and only very 

 obscurely yellow at the lateral margin, the grooves deep and broad, the sculp- 

 tvu-e on the intervals very obsolete ; the elytra much depressed in front of the 

 middle, strongly sculptured, but apparently to a variable extent, the side margin 

 well outstanding, epipleuron broad. Legs and palpi brown. Length 85 to 4 mm. 



This species is not very likely to be conf oi\nded with any other of the genus, 

 as it has rather the facies of the strigifrons allies. The aedeagus has no great 



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