94. MANDIBULATA. — COLEOPTERA. 



Extremely common in most places, frequenting every large patch 

 of water throughout the country ; var. 3 (which upon a transient 

 inspection I supposed to be a different species at the time my Cata- 

 logue was printing) was found in Worcestershire, and var. e ap- 

 pears to be not uncommon in Scotland. 



Sp. 2. canaliculars. Nigricans, capite antics lined transversa frontis, thoracis 

 limbo fasciaque media abbreviate, utrinque dilatatd, luteis; ventre ped'.busque 

 Jlavis. (Long. corp. 6^—7 lin.) 



Dy. canaliculars. Knock. — Ac. canaliculars. Steph. Catal. p. 53. No. 536. — 

 Ac. caliginosus. Curtis, ii. pi. 63. 



Rather less than the preceding ; head anteriorly luteous, posteriorly black, with 

 a transverse yellowish streak : thorax with its entire margin, and an abbre- 

 viated transverse discoidal fascia, dilated on each side into a somewhat rounded 

 spot, luteous : elytra dilated about the middle, very thickly irrorated with 

 dusky, with a very obsolete transverse black cloud towards the apex, and 

 the outer margin and a narrow line down the suture yellow : breast black, 

 thickly rugose-punctate : abdomen with the first segment entirely yellow, the 

 rest yellow, with an abbreviated dusky black fascia at the base : legs pale 

 luteous, immaculate. Female with the thorax glabrous : the elytra with four 

 villose sulci : tarsi simple. 



This fine species was discovered four years since in the fens of 

 Huntingdonshire by the two industrious collectors under mentioned. 

 " Stilton and Yaxley-fens, in July, 1824." — Messrs. Chant and 

 Bentley. " In Scotland, near Edinburgh.""-- Mr. Bainbridge. 



S 



|( Family IX.— GYRINIDiE, Leach. 



Antennas very short, rigid, 9-jointed, the second with a lobate appendage, the 

 rest forming a clavate cylindric mass: body oval, convex, or depressed, 

 generally very glossy: thorax transverse, sinuated before and behind: legs 

 unequal; the two anterior very long, gressorial; the four posterior short, 

 compressed, formed for swimming : eyes apparently four, two above and two 

 beneath the head ; the latter deeply inserted into the thorax. 



This family evidently contains several genera, but as they are for 

 the most part exotic, I shall merely allude to them in this place : 

 the generality of the species are of small size ; the larger ones ap- 

 proximate to the Dyticidse in form, but the structure of the antennae 

 and legs sufficiently distinguishes them. Their larvae differ from 

 those of the insects just named, by having on each side of the fourth, 

 and seven following segments, a membranaceous conical appendage, 

 which is flexible and bearded at the sides ; these appendages com- 



