HELOPIIORIDAE. 479 



Group Helophoridae. 

 Hydraenodes gen. nov. 



Mentura large, plane, subquadrate, without prominent anterior angles. 

 Maxillary palpi very long, basal joint minute, subglobular ; second very 

 elongate, gradually incrassate, about half of their whole length ; third 

 twice as long as broad, thickened towards the extremity, fourth longer 

 and more slender. Mandibles very short, arched. Labrum large, trans- 

 verse, with a deep narrow median notch, rounded in front towards the 

 sides, its basal suture fine and indefinite. Head horizontal, narrowed 

 anteriorly. Eyes rotundate, prominent, situated at the sides near the 

 base. Antennae 9, articulate, slender, little more than half the length 

 of the maxillary palpi ; basal joint subcylindric, second as long, very slightly 

 thicker, third about as long as second but more slender, fourth simple, 

 shorter than third, slightly longer than fifth, sixth and seventh small, 

 eighth larger, subquadrate, ninth oblong, these therefore appear to form a 

 biarticulate club. Thorax of equal length and breadth, its sides somewhat 

 explanate and on a lower level than the disc, obtusely angulate near the 

 middle, sinuate and distinctly narrowed towards the obtusely rectangular 

 posterior angles, apex slightly rounded in the middle and somewhat 

 oblique near the obtuse angles, base truncate. Scutellum indistinct or 

 absent. Elytra oblong-oval, hardly any wider than thorax at the base, 

 but with obtusely dentiform but not projecting shoulders, broadh' rounded 

 behind, with a spiniform process on the suture near the extremity. Legs 

 elongate, minutely pubescent ; tibiae almost straight, the intermediate 

 pair, on the inside, with a distinct though somewhat obtuse angulation 

 between the middle and apex. Tarsi slender, almost equalling the tibiae 

 in length, basal two joints short, the fifth as long as all the others united, 

 with simple claws. Abdomen composed of seven segments, 2-4 subequal, 

 the next two rather longer, sixth medially emarginate behind, seventh short 

 and broad, slightly emarginate. Prosternum with obtusely prominent 

 front angles, truncate between them ; anterior coxae contiguous, the inter- 

 mediate moderately separated, the intervening process cariniform. 



I have no species of Hydraena in my collection for comparison, but 

 judging by the generic diagnosis (Lacord., Hist, des Ins. Coleopt., vol. 1, 

 p. 469) this differs in several details. 



3982. Hydraenodes spinipennis sp. nov. 



Elongate, medially narrowed, slightly convex, nitid, glabrous above ; 

 piceo-niger, legs and palpi fusco-rufous, antennae testaceous, tarsi more 

 rufescent. 



Head, eyes included, nearly as broad as the widest part of thorax, 

 almost as long as it is, Avith a few fine punctures and an elongate impression 

 alongside each eye ; labrum smooth, rather less nitid. Thorax finely 

 margined, disc irregularly and moderately coarsely punctate, more distantly 

 before the middle, with a transverse impression in front, the sides with an 

 obtuse, subrotundate, apical elevation and an elongate basal fovea. Elytra 

 more than twice the length of thorax, distinctly seriate-punctate, rather 

 more coarsely than the thorax, less distinctly behind. 



Underside dull-blackish, with numerous very short, depressed brassy 

 setae, but the sixth and apical half of the fifth segment are glabrous and 

 shining ; metasternum impressed along the middle. 



