198 [February 



LiBUKNiA Ebti, Fieb. 

 Fieber, Grundz. Delph., 11, 7, t. 8, fig. 31 (^ genitalia). 



Crown nearly double as long as wide ; elytra transparent, about two-thirds as 

 long as the abdomen, hind margin narrowly blackish ; legs pale, abnormally long, 

 knees (especially the hinder pairs) with a distinct black spot. <? , pronotum white, 

 with a black patch behind each eye, side keels not reaching the hind margin; 

 scutellum black ; abdomen black, the base widely and the last segment yellow ; 

 pygofer yellow above, black beneath. ?, dirty brownish-yellow, with pitchy i 

 markings on the abdomen, resembling in contour the same sex of i. notida, but a 

 little larger. 



I found this fine species amongst rushes in a marsh at Weybourne, 

 Norfolk, in August last, iu a situation which wouhl not be readily 

 accessible in any but an abnormally dry season. 



131, Rupert Street, Norwich : 



December ^Ist, 1887. 



ACENTROPUS NIVEUS IN NORFOLK. 

 BY C. a. BAEEETT, F.E.S. 



On August 24th I went over to Stalham to meet my old friend 

 Mr. Wheeler, and to spend a few hours in our old haunts, the fens. 

 As we moved from the village we were delighted to see Paj)iUo 

 Machaon (2nd brood) flying across from fen to fen. (I hope that the 

 pleasure was reciprocal, for we could by no means follow or interfere 

 with them). We looked longingly and proceeded. In crossing 

 Barton Broad we suddenly found that our boat was an object of 

 pursuit ; not that there was cause for alarm, our pursuers were not 

 dangerous, being only very lively little males of Acentropus niveus, 

 which we had disturbed from their resting places on the floating 

 weeds, and which were consequently eager to find something solid 

 whereon to rest. 



Their movements were most curious, as they did not rise from the 

 surface of the water, but buzzed along it in a zigzag course, moving 

 their wings with great velocity, and really making very respectable 

 progress. On looking down we found that some had overtaken us, 

 and had climbed on to the rudder, where they remained quiet just clear 

 of the water, and were boxed without difficulty, as w^ere the pursuers 

 as they came up. Of course our movements often caused them to be 

 immersed, but to this they appeared totally indifferent. "We now 

 searched the floating weeds and rubbish, and found more males than 

 we cared to take, but with all our care were unable to meet with a 

 female. The bottom of this Broad is nearly covered with Stratiotes 

 nioides (water soldier), and we pulled up many plants and examined 



