2i8 The species of AmblycJiila. [zoE 



Lohtim perenne L,. 



Horde inn viurinum L,. 



Equisetiuii arvensc I,. Abundant on the clay of the levee. 



Woodwardia i-adicans Smith. 



Aspleniiim Filix-foemina Bernh. 



Aspidiiun rigidnm var. arguhim Eaton. Ferns were observed 

 only about the levee. 



Mosses, Liverworts and Lichens are conspicuous only by 

 their absence, but fungi — parasitic on living plants — abound. 



THE SPECIES OF AMBLYCHILA. 



[with Plates xxviii, xxix.] 

 BY J. J. RIVERS. 



Are there three species of Amblychila, or two, or only one? 



Having before me the three forms that have received names, 

 and having also Say's and Reiche's descriptions and also Thom- 

 son's " Monographie des Cicindelides " together with my descrip- 

 tion oi Am. Baroni, lam well prepared as far as material is con- 

 cerned to give a resume of the luckless paths into which 

 Amblychila cylindriformis Say, A. Picolominii Reiche, and A, 

 Baroni Rivers have been made to travel. 



In 1823 Say published his description oi A. cylindriformis; in 

 1839 another form which belonged to the Dupont collection was 

 described and figured under the name of A. Picolominii Reiche. 

 This insect was said to have been found near the bay and port 

 of San Francisco, California, in latitude forty-eight degrees north. 

 The locality is considered altogether an erroneous citation, as San 

 Francisco, Cala. is in thirty-seven degrees, forty-seven. ThediflS- 

 culty in the way of coming to an agreement in the identification of 

 these insects is the fact that both our most learned coleopterists have 

 pronounced Dupont's examples to be A. cylindriformis of Say, 

 while Reiche and Chaudoir consider them or some of them as 

 a distinct species. 



There appears much confusion concerning the identity of A, 

 Picolominii. Thomson's monograph gives a copy of the 



