176 GEO. H. HORN, M. D. 



Group IV.— CEDIONYCHES. 



Antennae 11-jointed, usually slender. Prothorax without trace of 

 ante-basal transverse impression. Anterior coxa! cavities open be- 

 hind. Elytra glabrous and with confused punctuation. Last joint 

 of hind tarsus globosely inflated at aj)ex. 



These few words define this group with sufficient sharpness to 

 enable any of its members to be recognized, and it seems to me that 

 the characters should be strictly ajjplied, so that no genus without 

 globosely inflated claw joint to the posterior tarsus should be admitted 

 here ; consequently, Homopha?ta has been excluded. Chapuis notes 

 the close resemblance between some Aspicelites and members of the 

 present group without realizing the necessity of a rearrangement of 

 the two groups. 



Two genera are known in our fauna separated in the following 

 manner : 



First joint of hind tarsus short and broad ; four anterior claws feebly appen- 



diculate, the posterior slender and simple Hamletia. 



First joint of hind tarsus moderately long and slender, claws all appendiculate. 



CEdiouycIiis. 



The first of these genera was placed by Chapuis in the Monoplati 

 under the name Pachyonychis. 



HAMLiETIA Crotch. 



Head not deeply inserted in the thorax, occiput oblique, front 

 vertical, labrum transverse, slightly sinuous at middle. Maxillary 

 palpi stout, the penultimate joint obconical, a little longer than wide 

 at apex, last joint acutely conical. Antennae 11-jointed, separated 

 at base by an obtuse frontal carina, joints 5-11 equal in width, 

 broader than those which precede, third and fourth joints nearly 

 equal in length. Thorax a little wider at base than long, very feebly 

 emarginate at apex, sides subangulate at middle, base truncate, dis- 

 tinctly sinuate at the hind angles. Elytra distinctly wider at base 

 than the thorax, humeri rounded; anterior coxal cavities open be- 

 hind, angulate externally, the trochantin visible. Posterior tibise 

 rather deeply sulcate on the outer edge and with a distinct sinuatiou 

 and small tooth above the insertion of the tarsus. First joint of 

 posterior tarsi short and rather stout, the claw joint globosely inflated, 

 the claws slender and simple. First joint of front tarsi broadly tri- 

 angular, the claws of this and middle tarsi feebly appendiculate. 



