COLEOPTERA. 



By Geo. H. Horn, M. D., Philadklphia. 



The species collected during the expedition of 1872 are very few in 

 number, and add scarcely anything to our knowledge of distribution, 

 and an unusually small number of new forms. They are distributed as 

 follows : 



YELLOWSTONE LAKE. 



Cincindela 12-guttata, Dej. 

 Carabus tcedatus. Fab. 

 Agabus, n. sp. 

 CoU/mbetes binofatus, Harr, 

 Gyrinus picipes, Aube. 

 affinis, Ai\h6. 

 Silpha lapponica, Hbst. 

 Gantkon simplex, Lee. 

 Dlplotaxis brevicolUs, Lee. 

 MelanopMla longlpes, Say. 

 Anclastes dniryi, Kby. 

 Adelocera profusa, Cand. 

 Goelocnemis dilaticollis, Maun. 

 Iphthimus serratus, Mann. 

 Tragosoma harrisii, Lee. 

 Argaleus nitens, Lee. 

 Grioceplialus protractus, Lee. 



agrestis, Kby. 

 Haltica blmarginata, Say. 



TETON BASIN. 



Gicindela mo7itana, Lee. 



Amarapolita, Lee. 

 gibba, Lee. 

 Harpalus oblitua, Lee. 

 Diplotaxis tristes, Kby. 

 Silis, n. sp. 



Eleodes humeralis, Lee. 

 Gantliaris sphwricoUifi, Say. 



SNAKE EIVER. 



Platynns deplanatus, Men. 

 jVothopus zabroides, Lee. 

 Harpalus oblitus, hec. 

 Ampliizoa lecontei, Matth. 

 Golymbetes seminiger, Lee. 



n. sp. 

 Dytiscus conjluens, Say. 

 Acmwodera. mixta, Lee. 

 Eleodes trieostafa, Say. 

 Gantliaris nuttali, Say. 



cyanipennis, Lec^ 

 JEpicauta pmicticollis, Maun. 



maculata, Say. 

 Ghrysomela philadelphica, Lin: 



The most interesting of all the species collected is Amphizoa lecontei 

 Matthews, described in July, 1872, by Eev. A. Matthews, in a pamphlet 

 issued by E. Janson, of Loudon, entitled '' Cistula Entomologica,'' p. 

 121. It differs from our well-known A. insolens, Lee, by the dorsum of 

 the elytra being depressed along the middle from near the base to the 

 apex, so that each elytron along its middle appears subcostate. Another 

 species has been described by the same author, (p. 119.) but I cannot 

 see any character by which it can be separated from the long series of 

 A. insolens before me. It has been named Ampliizoa Josex)1ii. The two 

 sexes of Ampliizoa do not* differ greatly ; the antenmB of the male are 

 very obsoletely subserrate, and the female has a somewhat broader form 

 of body. 



Of the three new species little need be said here. Two are wa'ter- 

 beetles, and the family is now in process of revision. The Telephoride, 

 Silis, will be described, with many other new forms, in a forthcoming- 

 review of the entire group. 



It is rather remarkable that no representatives of the families 

 Eisteridcv, GoccinelUdaj, and Gurculionidw appear, and very few Tene- 

 brionidw, although the region has on other occasions yielded many 

 representatives of all these families. 



