62 Journal New York Entomological Society. [Vol. xvi. 



claws, could be elevated to generic rank, which Mr. Gorham, how- 

 ever, advocates. 



The genus Plectonotum Gorh. is closely allied to Silis and Pole- 

 mius and was erected on the form of the male thorax which appears 

 as if the basal half of the reflexed lateral margin, from the incisure 

 to the basal angles, is cut away. The modifications of the lateral 

 margin of the known species of Silis and Polemius is so greatly 

 diversified that the erection of a new genus on this character alone is 

 hardly justified. 



Mr. Gorham in the " Biologia " describes basalis, nigrita, com- 

 busta, transfixa, fulvipes and lineola as Silis, but if we follow Leconte, 

 these species have to be placed in the genus Polemius. 



The genus Ditemnus Lee. is made a synonym of Silis by Mr. 

 Gorham. This is correct as far as the lateral modifications or proc- 

 esses of the thorax are concerned, but Dr. Leconte in his original 

 description gave, besides this, the different form of the palpi as an 

 additional character. How far the palpi differ in the species of 

 Ditemnus and Silis I am, however, unable to say, as I know only 

 D. bidentatus and a very small portion of the numerous described 

 species of Silis. 



The following list of the Lampyridae from the Huachuca Moun- 

 tains is interesting, as it shows more than any other family the So- 

 noran character of the coleopterous fauna of that region. 

 Rhyncheros sanguinipennis Say. Chauliognathus misellus Horn. 

 Lycus fernandezi Duges. " opacus Lee. 



Lycostomus fulvellus Lee. " limbicollis Lee. 



" rubescens n. sp. Discodon bipunctatum n. sp. 



" loripes Chev. " flavo marginatum n. sp. 



Cceniella amplicornis Lee. Polemius niger n. sp. 



Lygistopterus rubripennis Lee. " strenuus Lee. 



Plateros sp. " binotatus Fall. 



" nigerrimus n. sp. " arizonensis n. sp. 



Ellychnia californica Mots. Silis abdominalis n. sp. 



Pyropyga simplex Lee. " nigerrima n. sp. 



Phengodes n. sp. Plectonotum excisum n. sp. 



Euryopa n. sp. Podabrus mexicanus Gorh. 



Chauliognathus profundus 'Lee. " comes Lee. 



" ineptus Horn. Malthinus subcostatus n. sp. 



Malthodes bicolor Lee. 



