372 Coleopterological Notices, V. 



Hygronomides. 



Antennse 11-jointed ; tarsi 4-4-4-jointed. 



GYROIVYCHA u. gen. 



Body elongate, linear and depressed. Head moderate in size, 

 constricted at base, the neck usually about one-half as wide ; eyes 

 large, distant from the base, sparsely setose; labrum short, trun- 

 cate; infralateral carina obsolete, feebly traceable anteriorl3\ An- 

 tennae very long, slender, subfiliform or feebly and gradually incras- 

 sate from near the base; basal joint elongate, longer than the second 

 or third, the latter elongate and subequal ; outer joints seldom at 

 all transverse. Mentum moderate, transversely trapezoidal, trun- 

 cate, impressed on the disk at each side. Ligula with a stout par- 

 allel apical process, the labial palpi moderate, three-jointed, the basal 

 joint the longest and thickest, cylindrical. Maxillary palpi moder- 

 ate, the third joint but slightly longer than the second ; fourth small. 

 Mandibles simple and acute at apex. Prothorax oblong, feebly nar- 

 rowed behind and broadly sinuate — viewed sublaterally — the apical 

 angles abruptly and feebly deflexed ; hypomera feebly inflexed, very 

 distinct from the side, entire. Elytra large, long and well devel- 

 oped. Abdomen elongate and linear, the fifth segment usually 

 distinctly longer than the fourth ; first four segments more or less 

 impressed at base. Middle coxse contiguous, the mesosternal pro- 

 cess very acute, prolonged to the middle, the metasternal process 

 extremely short, broadly angulate, scarcely at all entering between 

 the coxae, the distance from its tip to a point beneath the free apex 

 of the mesosternal occupied by a fine linear compressed and earini- 

 form isthmus; acetabula tolerably well defined behind. Metaster- 

 num large, the side-pieces narrow, linear and parallel ; epimera 

 rather small, disappearing under the elytra well behind the middle. 

 Legs rather short; anterior tibite normal ; tarsi short, 4-4-4-jointed, 

 the first joint of the posterior more or less elongate, generally not 

 quite as long as the next two and subequal to the last, the latter 

 rather stout but scarcely at all incrassate ; ungues well developed, 

 divergent, abruptly bent downward behind the middle and some- 

 what broadened at the point of flexure. 



This very interesting genus is the American representative of 

 the European Hygronoma, and is probably rather extensive, ex- 

 tending from the Atlantic to the Pacific and occurrinir in the hiu-h- 



