appearance of numerous cup-shaped joints that 1 am doubtful 

 whether they may not be membranous articulations. 



It appears to me that I have three species of Polycentropi, 

 which 1 shall proceed to describe, observing that the first of 

 them may be the H. jlavo-maculata of Mons. Pictet. 



1. trimaculatusCwy/. Lond.Sf Edin. Phil. Mag. v. 4, Genus 751, 



No. 4. 



Male. Expansion scarcely 6 lines. Fuscous with an ochreous 

 or coppery tinge : head clothed with pale shining hairs; 

 antennae annulated with the same colour; superior wings 

 with numerous ochreous round spots, most distinct to- 

 wards the margin, where they form a line, with fJ in 

 triangle at the posterior angle; legs dirty ochre. 

 The above name I applied to this species when 1 had only 



a bad specimen, in which most of the spots, excepting the 3 



above noticed, were obliterated. 



I believe I found this insect twice in a ditch at Horning, 



Norfolk, in June. 



2. multiguttatus Curt. MSS. 



Male, expansion 6, female 8 lines. Fuscous, iridescent : an- 

 tennae nearly as long as the superior wings in the male, 

 spotted or annulated with ochre ; superior wings with in- 

 numerable ochreous spots, with a white dot on a fuscous 

 space on the interior margin, and an oblique line on the 

 disc ; posterior tibiae brown, especially the upper side in 

 the male. 

 The blacker colour of the upper wings and the hinder tibiae, 



and the whitish transparent dot and line on the former, most 



evident in the female, distinguish this from the former species. 

 It appeared in multitudes on the shores of Loch Fad in the 



Isle of Bute the beginning of last August. 



3. irroratus Curt. Brit. Ent. pi. S't^ c? • 



Male, expansion 6f to 8 lines, female 9 lines. Brown, head 

 and thorax with shining yellowish hairs ; antennae annu- 

 lated with ochre; superior wings with numerous ochreous 

 silky spots, close together, but leaving several spaces, 

 forming 7 or 8 brown patches on the costa, disc, and in- 

 ferior margin; under wings very iridescent; legs dull 

 ochreous, with a pale castaneous tint. 

 The brown spots on the upper wings, most evident in the 

 males, distinguish this species from the others. 



I took specimens the middle of last August in the Isle of 

 Arran, and the beginning of September I met with others on 

 large masses of rock in the bed of the river at Cartland Craigs, 

 a magnificent and highly picturesque ravine near Lanark, 

 which I visited with Mr. Haliday and Mr. H. Walker. 



The Plant is Schoenus nigricans (Black Bog-rush), commu- 

 nicated by Jas. Paget, Esq. 



