198 ADBPHAGA. [IlljhhlS. 



narrowed and cylindrical aa in P. maculaius, but the eighth joint is plainly con- 

 stricted in the middle ; the claws are rather short, equal : the pupa3 very much 

 resemble each other, but that of I. fenestratus is longer and more parallel-sided. 



I. Upper surface of a brown bronze colour plainly metallic. 



i. Elytra with a broad yellow lateral border I. fuliginosus, F. 



ii. Elytra without lateral yellow border. 



1. Hind tnrsi of male with the joints externally 



margined at their lower edge I. sub^neus, Er. 



2. Hind tarsi of male with the joints not externally 



margined at their lower edge I. fenestbatus, F. 



II. Upper surface black with a slight bronze reflection. 



1. Length 8-9 mm. ; apical ventral segment of male 



not distinctly longitudinally rugose I. ^NESCENS, Thorns. 



2. Length 13-14 mm. ; apical ventral segment of male 



very plainly longitudinally rugose I. ATEE, De G. 



III. Upper surface deep black without trace of bronze reflec- 

 tion. 



1. Length 11 mm.; male with claws of anterior tarsi 



toothed I. OBSCUEUS, Harsh. 



2. Length 9 mm . ; male with claws of anterior tarsi 



simple I. GUTTIGEE, Gt^ll. 



I. fulig-inosus, F. [uliginosus, L.). Oval, ratlier narrow, convex, 

 not very shiny, under side testaceous red, upper surface aeneous with 

 the head and sides of thorax more or less obscurely ferruginous ; elytra 

 Avith margins broadly testaceous from base almost to apex ; upper side 

 very thickly and finely reticulate ; male with the front and middle tarsi 

 a good deal thickened, and furnished beneath with long hairs bearing 

 narrow palettes ; last ventral segment covered with long although not 

 deep wrinkles, and having a short raised keel in the middle ; female 

 with a large emargiuation at the apex of this segment, and in the middle 

 a coarse prominence or short fold. Long. 10, lat. 5 mm. 



Clear and running water; common and widely distributed throughout the 

 kingdom, 



I. subaeneus, Er. Oval, convex, not elongate, under side pitchy 

 or rufous, upper side a?neous with margins of thoiax and elytra lighter; 

 antennae and legs red ; upper surface finely and densely reticulate, elytra 

 with two obscure pale spots ; the body is broadest in and not behind the 

 middle ; male with the whole of the apical portion of last ventral 

 segment covered with coarse longitudinal striae, without any trace of 

 central keel ; female with this segment appearing deejoly notched at 

 apex, with two or three wrinkles on each side ; in /. fenestratus the 

 male has a strongly developed keel, and the posterior coxse are more 

 produced towards the intermediate coxse. Long. 11|, lat. 6 mm. 



Very doubtful as British; its claim to be admitted into our lists rests on a single 

 specimen taken twenty years ago by a friend of Mr. Newman's at Peckham ; Dr. 

 Power determined the species : it has, however, never been found since, and requires 

 further confirmation. 



I. fenestratus, L. Oval, convex, under side ferruginous, upper 

 side aeneous with margins of thorax and elytra narrowly lighter, some- 



