DYTICID/E. HALIPLUS. 39 



situation of the scutellum : body oval, convex, posteriorly attenuated : legs 

 long, slender, gressorial : the posterior femora covered at the base with a 

 broad shield-like lamella : claws didactyle. 



Haliplus consists of several insects, which vary much amongst 

 each other, and differ in such trifling particulars, that it is very pro- 

 bable some of the apparent species and varieties are not distributed 

 strictly in accordance with their natural distinctions : the genus 

 bears considerable affinity to the Bembidiidse in the structure of the 

 palpi, the terminal joint being very small and subulated, in which 

 particular it may be known at once from the other Dy ticidse ; it also 

 differs essentially from the rest of the family by the magnitude of 

 the laminae which cover the posterior femora, the short, and appa- 

 rently ten-jointed, antennae, and in other less important characters, 

 and it may probably form the type of a new family of Hydrade- 

 phaga, approximating closely to the genus Omophron (amongst the 

 Elaphridae?) a genus which has not hitherto been discovered in 

 Britain. 



A. Elytra with elevated lines. 

 Sp. 1. elevatus. Supra palUdus, elytris convexis punctato-striatis, nigro-lineatis, 



costd disci elevatd abbreviatd. (Long. corp. 2 lin.) 

 Dy. elevatus. Panzer. — Ha. elevatus. Steph. Catal. p. 42. No. 413. 

 Elongate, pale-testaceous: head deep testaceous, convex, punctulated: eyes 

 dusky : thorax transverse, narrower than the elytra, finely but sparingly punc- 

 tulate, with an impressed line on each side, parallel with the lateral margin : 

 elytra oblong-ovate, dilated at the base, attenuated at the tip, above slightly 

 convex, each with eight elongate and two abbreviated, deeply-punctate stria?, 

 the latter on the shoulders, and all but the two marginal ones dusky ; the 

 suture black : the interstices smooth, the third from the suture much elevated 

 anteriorly: body deep testaceous beneath, subpunctate, the base of the ab- 

 domen pitchy ; the abdominal lamina? deeply punctated : legs very long, pale 

 testaceous. 

 The elytra are more or less suffused with black between the strise in different 

 individuals. 



Not very common : occasionally met with in running streams 

 near Bexley. 



B. Elytra without elevated strios. 

 Sp. 2. impressus. Ovatus, convexus, Jlavo-testaceus, niiidus, elytris cinereis, 

 profundi punctato-striatis, interstitiis impunctatis, thorace postice transversim 

 profundi impresso. (Long. corp. if — 2 lin.) 

 Dy. impressus. Fabricius. — Ha. impressus. Steph. Catal. p. 42. No. 414. 



Ovate, convex, testaceous-yellow : head testaceous, punctulated : thorax flaves- 

 cent, the disc convex, the base with an arcuated impression, in which is 

 a series of deeply impressed dots, the anterior and posterior margins rather 

 clouded : elytra cinereous, very convex, rather obtuse behind, he apex itself 



