NORTH AMERICAN COLEOPTERA. 19T 



The species at present known are three, and may be thus separated : 



Body in great part piceous or black. 



Thorax vaguely coarsely punctate tenuipes. 



Thorax smooth laevis. 



Reddish yellow, antennae, elytra and tarsi black bicolor. 



D. tenuipes Hald. Proc. Acad, iii, p. 12(i; Hakl. Prim. Am. Philos. Soc. iv, p. 

 .^.74: Lee. Journ. Acad. 1852, ii, p. 143. 



ventralis 9 Hald. Proc. Am. Philos. Soc. iv, p. P.74. 

 D. laevis Lee. New Species, 1873, p. 24rf. 

 D. bicolor n. sp. supra. 



The species of this genus are all extremely rare, those taken in Penn- 

 sylvania have been reared from the terminal twigs of hickory which fall 

 from the trees during the storms of winter, they probably appear in May 

 or June. 



The information on which the following remarks are based was re- 

 ceived too late to enable me to insert it in its proper place near the 

 beginning of the paper : 



PliAGITHMYSUS Mots. 



This name has been used in the Classification in place of Neoclytus. 

 The scope originally accepted for the latter genus by Dr. LeConte in the 

 Classification of 1873 included Plagithmysus as defined by Motschulsky, 

 the latter name being the older was therefore used. 



It is, however, the opinion of Dr. Sharp and others that Plagithmysus 

 is worthy of being retained separate from Neoclytus, and he has, in fact, 

 re-described the former under the name Clytarlus (Trans. Ent. Soc. Lond. 

 1878, p. 137), indicating in all ten species from the Sandwich Islands 

 (Trans. Royal DubUn Soc. 1885, p. 261) one of which (C Blachhimii 

 Shp.) seems to be the same as P. pulverulentus Motsch. It is probable 

 that Motschulsky's specimen, obtained from Eschscholtz, came from the 

 islands and not from California. There is, however, one specimen in Mr. 

 Salle's cabinet which came from California. The name Neoclytus should 

 remain for our species, and from present appearances Plagitlimysus pul- 

 verulentus should be dropped from our lists as an accidental introduction. 

 Rliopalopachys morosus Chev. = Neoclytus irroratus Lee. 



