APPENDIX. 391 



Page 46. Sp. 1. Hygrotus fluviatilis: in the specific character the word acuta 

 should be arcuata. 



Page 46. Sp. 1 a. Hygkotus Stephensii. Rudd MSS. — Sieph. Nomen. "Zd edit, 

 col. 15. — Niger, supra Jlavo-testaceus, thorace utrinque striolaimpressa,elytris 

 lineis nebuUsque atris, pedibus totisferrugineo-testaceis. (Long. corp. IJ — 

 1§ lin.) 



Above testaceous-yellow: thorax with an impressed line on each side, the 

 disc obscurely raised and dusky ; elytra paler, with a large patch of black 

 at the base, and two smaller ones towards the apex, united by black lines 

 of dissimilar length, occasionally interrupted and partially confluent; legs 

 and antennae entirely ferruginous ; body beneath black ; abdomen sometimes 

 slightly pitchy. 



For this species I am indebted to the Rev. G. T. Rudd, who finds it near 

 Stockton-on- T ees. 



Page 47. Sp. 4. Hygr. decoratus. Curtis, v. xn. pi. 531. — " Near Askam 

 Bryan, Yorkshire," the Rev. J. D. J. Preston, to whom J am indebted for 

 specimens; also near "Cambridge." — C. C. Babington, Esq. 



Page 49. Sp. 9. Hygr. inaequalis. Fabricius. — Dytiscus trifidus o{ Mar sham, 

 as stated in my Catalogue, No. 436, the name being transposed in reprinting 

 my Nomenclature. 



Page 52. Sp. 4 a. Hydroporus griseostriatus. Steph. Nomen. 'Sd edit. col. 15. — 

 Dyt. griseo-striatus, Deger. Ins. iii. 103. — Oblongo-ovatus subdepressus niger, 

 thorace pallida medio nigro vario, elytrorum limbo lineisque plurimis inter' 

 ruptis pallidis. (Long. corp. 2k lin.) 



Oblong-ovate, somewhat depressed, black ; thorax pale, varied with black in 

 the middle ; elytra with the margin and several interrupted lines pale. 



Found, but rarely, in the north of England. 



Page 54. Sp. 11a. Hydro p. borealis. Gyll. Ins. Suec. iv. p. 586. — Steph. 

 Nomen. 2d edit. col. 16. — Oblongo-ovatus, subtus niger, supra jlavo-testaceus, 

 vertice utrinque arcii nigro, thorace elytris angustiore 7indique impresso, 

 lineaque laterali insculpto, elytris nigro-lineatis, apice subacuminatis. (Long, 

 corp. 1^ — 2 lin.) 



Oblong-ovate ; beneath black, above testaceous-yellow, with a black crescent 

 on each side of the vertex; thorax narrower than the elytra, impressed 

 throughout, with an impunctate line on each side ; elytra striped with 

 black, rather acute at the apex. 



Differs chiefly from Hyd. alpirius in the mark on the crown of the head, and 

 in the apex of the elytra being more obtuse. 



Found in Scotland. 



Page 53. Sp. 9. Hydro p. alternans occurs in Scotland. 



Page 54. Sp. 11 b. Hydrop. Davisii. Curtis, v. wm. pi. 343. — Steph. Nomen. 

 2d edit. col. 16. — Niger, supra ie.ifaceo-flavns, capife postice lineis duabus 



