BnjcMus.'] ADKPII.VGA. 151 



punctured, cyos somewhat proiiiiuent ; tliorax transverse, roumUnl in 

 front, straiglit towards hase, anterior and pofrterior margins sometimes 

 fuscous, base with deep impressions; elytra with Llack plainly punctured 

 stria?, which become feebler at sides; third interstice raised into a keel 

 until beyond middle, sixth interstice also raised towards base. L. 

 3i-4 mm. 



Somewhat local but widely distrihntod throughout England from uorth to south 

 in brooks and rivers ; Scotland, common in rapid streams. Lowlands, Tweed, Forth, 

 Sohvay, Clyde, Moray ; Ireland, Dublin, Loughlinstowti, and Armagh, and probably 

 common. 1 have tbnnd it on loirs in tlie Dove near Jiurton-on-Treut in company with 

 Macronychus aud Hydropoms \2-puslulatus. 



KAZ1ZFI.TTS, Latreille'. 



This and the jireceding genus are remarkable for the very small and 

 sul)ulate terminal joint of the palpi, in which point they resemble the 

 Bemlniliina, which on this account have been for a long time placed at 

 the end of the Carabid<B. 



About forty or fifty species are comprised in the genus, which occur 

 chiefly in Europe and North America, a very small proportion being 

 found in China and Australia ; they live in both fresh and brackish 

 water, in stagnant ponds and. also in running streams, attached to aquatic 

 plants, &c. 



The larva? of Haliplus are very peculiar iu their structure : those of H. rtificolUs 

 and H.fulvu.i are figured by Schiiidte, ii., PI. viii.. Fig. 1 aud 16. 



The iarva of II. rnJicuUis (Fig. 1) is linear, very long, somewhat cylindrical, and 

 niouiliform, the segments being contracted at apex and base, whitish or whitish yellow 

 with the roughnesses on the corneous parts fuscous ; the head is much narrower than 

 the protkora.x, which is large ; all the dorsal scuta are furnished with a large longi- 

 tudinal depression on each side, and have their posterior angles produced into a sharp 

 point : in all except the ninth the basal space between the posterior angles is produced 

 into four short equal obtuse teeth; the whole surface of the dorsal scuta as well as 

 of the anal appendage is granulose ; the anal appendage is very long, slender, and 

 divided at apex into two setose processes ; there are no cerci ; the legs arc rather 

 long, and are terminated by simple claws; the larva is sluggish, and uses its whole 

 body for locomotion as well as its legs. 



The larva of H./u/rus dillers very much iu appearance from the preceding, each 

 scutum being furnished witli tour large stout sj)ines which are double as long as the 

 segment that hears them, and point downwards towards apex; the anal appendage is 

 as long as or longer than the whole of the abdominal seguieuts, and is divided at the 

 apex into two very slender setose processes. 



The pupa of 7/. varipuafus is figured by Schiiidte with the above insects: it is rather 

 short and broad, and furnished with short, stout spines. 



I. Elytra with rows of feeble punctures. 



i. Base of tliorax without an impressed longitudinal 



stria on each side H. ODLlQrr?, F. 



ii. Base of thorax with an impressed longitudinal 



stria on each side H. CONFINIS, Steph. 



II. Elytra with rows of deep punctures. 



i. Base of thorax without longitudinal stria on each 

 side. 

 1. Head broad; thorax not strongly conti-:ietcd in 



front II. MLCHONATI'S, Sti'ph. 



