60 MANDIBULATA. COLEOPTERA. 



Found occasionally near London. " Southend, and Netley, 

 Salop."-- Rev. F. W. Hope. 



Sp. 28. planus. Oblongo-ovatus, depressus niger, pubescens, tibiis solis rufis. 



(Long. corp. 1 J lin.) 

 Dy. planus. Mar sham. — Hyd. planus. Steph. Catal. p. 47. No. 466. 



Minute; oblong-ovate, depressed, pubescent, black: elytra rather pale at the 

 base, obsoletely punctulate ; with a very faint abbreviated stria in the middle 

 of the base ; beneath pitchy-black : the legs pitchy, with the tibiae alone rufous. 



Probably a variety of one of the foregoing ; to Hy. trivialis it approximates most 

 closely, but its form appears dissimilar. 



The above description drawn from the Marshamian specimen, 

 which I believe was taken near London. 



Sp. 29. melanocephalus. Oblongo-ovatus, subconvexus, niger, glaber, antennarum 

 basi ferrugined, pedibus piceis. (Long. corp. l| — if lin.) 



Dy. melanocephalus. Marsham. — Hyd. melanocephalus. Steph. Catal. p. 47. 

 No. 467. 



Oblong-ovate, subconvex, black, glabrous, very finely and faintly punctulate 

 throughout: head with the margin of the crown pitchy-red: thorax trans- 

 versely convex, nearly smooth, anteriorly and posteriorly impressed, entirely 

 glossy black: elytra oblong-ovate, moderately convex, glossy black, imma- 

 culate: body beneath shining black, sparingly punctate: legs pitchy-black, 

 with the joints dull testaceous: antennae ferruginous at the base, black at the 

 apex. 



Var. /3. With the elytra and legs dull pitchy-red ; the elytra dusky on the back : 

 probably immature. 



Extremely abundant in ponds and rivulets throughout the me- 

 tropolitan district, and in Norfolk. " Frequent in ditches near Ely, 

 and elsewhere in Cambridgeshire.'" — Rev. L. Jenyns. 



Sp. 30. erythrocephalus. Oblongo-ovatus, convexior, niger, pubescens, capite 

 pedibusque rufis, thoracis elytrorumque margine obscure ferrugineis. (Long, 

 corp. 1^— if lin.) 



Dy. erythrocephalus. Linne. — Hyd. erythrocephalus. Steph. Catal. p. 47. 

 No. 468. ' 



Oblong-ovate, rather convex, black, pubescent, finely punctulate: head rufo- 

 ferruginous, with a dusky cloud between the eyes : thorax obscure black, the 

 lateral margins more or less ferruginous: elytra a little glossy, pubescent, 

 rather strongly punctate, with the shoulders and lateral margin somewhat tes- 

 taceous: body beneath shining black, punctulated: legs elongate, entirely 

 rusty-red : antennae testaceous at the base, dusky at the apex. 



This is likewise very common in the vicinity of London. " Found 

 with the last." — Rev. L. Jenyns. 



