Coleopterological Notices. 145 



The fifth antennal joint in ptilioides is represented on the plate as 

 being slightly elongate; it is correspondingly transverse in the pre- 

 sent species, and the joint immediately before the club is strongly 

 transverse and not elongate as in ptilioides. The sutural stria is 

 feeble and continuous with the basal stria/ 



BYRRHID.E. 

 LIMIVICHIJS Latr. 



The species of this genus, although but moderate!}' numerous in 

 the United States, appear to be much more abundant and diversified 

 in structure than their European congeners. Our species have 

 never been fully described, and have been somewhat neglected by 

 systematists. The table given by LeConte (Bull. U. S. Geol. Surv., 

 Y, p. 515), bears evidence of insufficient observation, and I have 

 not found it of very great service in identifying the species, which 

 in reality are well differentiated. They may be divided as follows 

 into four subgeneric groups, which are perhaps of still greater value. 

 These groups are all distinct from the representatives of the palie- 

 arctic fauna, there being generally no trace whatever of the antennal 

 groove on the superior surface of the head which is such a singular 

 character of Limnichus proper. In all of our subgenera the antennae 

 are perfectly free in repose, although generally pressed closely against 

 the head, and between its surface and the projecting anterior margin 

 of the prothorax. In the first group (Eulimnichus), the last vestige 

 of the groove is visible, being indicated by a minute carina border- 

 ing the sides of the head above the eye, but it can be of no use as 

 a shelter for the antennse in repose : — 



Pubescence in a single system, rather sparsely distributed, subrecumbent, 

 robust and aciculate. 

 Head longitudinally rugulose ; basal joint of antennje in great part con- 

 cealed by the acute sides of the front, the emarginations at the extremi- 

 ties of the epistomal suture small. Prosternum grooved ; hypomera flat, 

 not impressed at the inner angle, having a wide prominent polished bead 

 along the inner margin ; margin of the crural excavation acute and 

 cariniform ; acute outer edge minutely and abruptly reflexed at apex. 



' Dr. Sharp, who has been kind enough to compare a specimen of this species 

 with the type of ptilioides in the British Museum, writes me that, although the 

 light at the time was very poor, he has no doubt of the distinctness of califor- 

 nicum. 



AsNALS N. Y. Acad. Sci., V, Feb. 1890.— 10 



