302 MARTIN JACOBY 



IWotes on some North American species of HALTICIN^ 

 (Gronp JVIonopIati). 



BY MARTIN JACOBY, Loncloii, England. 



At the suggestion of Dr. Horn, during his recent visit in London, 

 I have examined several genera of Halticinte of the group with 

 globular claw-joints, described by Clark in his monograph and in- 

 habiting North America, of which the types are contained in the 

 British Museum. I give here the results of my examination. 



HA1VIL.ETIA Crotch. 

 Pachyonychis Clark. 



The type of this insect, of which a single specimen (unfortunately 

 not in good condition) is contained in the Museum collection, al- 

 though belonging to the section of Halticinae with globular claw- 

 joints, cannot find its place at all amongst the Monoplati, since its 

 elytra are not punctate-striate, but irregularly punctured, and its 

 anterior coxal cavities are not closed, but open ; the antennae and 

 the posterior claws are entirely or partly wanting, but have been 

 described by Clark. It is evident that a Pachyonychis paradoxus and 

 a Pachyonychus paradoxus cannot both be retained, and that, there- 

 fore, Crotch's name of Hamletia should be restored for this species ; 

 the latter is, however, not of a dark olive green, but of dark blue 

 color, and should find its place ne^ir Physodactyla Chap, and Eu- 

 tornus Clark. 



PACHYOXYCHUS Chev. 



Pacliyonychus paradoxus Melsh. 



This species is a true representative of the group, and was evi- 

 dently unknown to Clark. Crotch has given a renewed description 

 of the insect, which has nothing at all in common with Clark's pre- 

 ceding species ; neither does it belong to Phcedromus, as mentioned 

 by LeConte (Classific. N. Am. Coleopt. p. 350). 



