GYRINIDJE. GYRINUS. 97 



Sp. 4. natator. Ovatus, casrulescenti-niger, glaberrimus, elytris suhtilissime punc- 

 iato-striatis, margine subtus ano pedibusque ferrugineis. (Long. corp. 2f — 3^ 

 lin.) 



Gy. natator. Linne. — Samou.pl. 2.f. 2. — Steph. Catal. p. 54. No. 540. 



Ovate : glossy blue-black : head as in Gy. aeneus, with the mouth rufescent : 

 thorax anteriorly and posteriorly sinuated, above convex, with an arcuate cre- 

 nated striga on each side within the anterior margin, and a simple obsolete 

 one towards the middle of the disc : scutellum small : elytra subovate, atte- 

 nuated posteriorly, above convex, very glossy, blue-black, greenish towards the 

 margins, very finely punctate-striate, the inflexed margin pale testaceous: 

 body shining brassy-black beneath, with the apex ferruginous, the breast 

 testaceous, and the legs pale ferruginous. 



Abundant in ponds and stagnant waters in several parts of the 

 kingdom. 



Sp. 5. substriatus. Subovatus, ccerulescenti*niger, nitidus, elytris tenuissime 



punctato-striatis, margine inflexo ferrugineo. (Long. corp. 3 lin*) 

 Gy. substriatus mihi. — Steph. Catal. p. 54. No. 541. 



Head and thorax as in Gy. natator : elytra deep blue-black, obscurely tinged 

 with greenish on the outer margins, the disc very slightly striated, the striae 

 composed of remote punctules ; the inflexed margin deep ferruginous : body 

 beneath as in Gy. natator. 



Similar to the last, but differs in the very obsolete striation of the elytra : it 

 may possibly be a mere variety, but I have seen many specimens. 



Taken near London, and in Devonshire. " Yaxley-fens, June 

 and July." — Mr. Chant. " Common near Bottisham." — Rev. L. 

 Jenyns. " Kimpton." — Rev. G. T. Rudd. 



Sp. 6. lineatus. Plate XIII. f. 2. — Ovatus, supra ceneo-niger, infra piceo-fer* 

 rugineus, elytris obsoletissime punctato-striatis, lineis longitudinalibus subaneis 

 ornatis, margine inflexo ferrugineo. (Long. corp. 3 — 3^ lin.) 



Gy. lineatus. Hqffmansegg. — Steph. Catal. Appendix. 



Ovate; deep brassy-black above, very glossy: head as in Gy. natator, with the 

 labrum bright seneous : thorax and elytra also as in the last-named insect, 

 but the latter with the striae nearly entirely obliterated, especially on the back, 

 and their places occupied by several longitudinal rather obscure streaks or 

 lines, appearing rufescent in certain lights; the outer margin is greenish- 

 brass, and the inflexed one ferruginous : body beneath entirely pitchy-ferru- 

 ginous, with the legs paler. 



" Slap ton Ley, near Dartmouth, middle of June, 1828." — Messrs. 

 Chant and Bentley. 



Sp. 7. bicolor. Oblongus, subcylindricus, nigro-ca?rulescens, glaberrimus, elytris 

 subtilissime punctato-striaiis, margine inflexo, pedibusque ferrugineis. (Long, 

 corp. 3— 3 1 lin.) 

 Mandibulata. Vol. II, 1st Oct. 1828. H 



