September — October iSSS.] 



PSrCHE. 



109 



species I would express my hearty ad- 

 miration of tiie great zeal and success 

 in studying our Coleoptera, of Dr. Geo. 

 H. Horn. 



Of the habits of G. hornii I cannot 

 now say much. Air, Ulke writes me 

 that he finds it under electric lights in 

 Washington, but that he does not thus 

 find balyi-i which is common, he says, 

 in the mountains of Virginia. The 

 latter species is also common about 

 fungi in Massachussets. 



Anoplotriipes has but one species in 

 our fauna, balyi^ sufficiently defined 

 by the table of subgenera and the com- 

 parative notes above. It is usually 

 smaller than G. hornii^ the color is 

 usually a deep black green and alwa} s 

 more or less metallic. Specimens have 

 been seen with the bottom of the striae 

 distincly purple, others have the whole 

 surface of the elytra and even the thorax 

 purple. 



Peltotriipes chalybaejis is polished 

 black blue with the lateral margins of 

 a brighter blue, three or four striae 

 next the sutiu-e on each side are im- 

 pressed, the others hardly impressed, 

 all have rows of fine punctures. The 

 anterior tibiae have on the upper sur- 

 face the usual inner impressed line 

 bearing a row of setae but the adjacent 

 outer carina is quite absent. The 

 imiddle and hind tibiae are rather dense- 

 y fringed with spines on each outer 

 margin and on the cross ridges and the 

 spaces between are punctate and bear 

 short bristles ; in our other Geotnipes 

 the middle and hind thighs are flattened 

 posteriorly to receive the tibiae, and 



have the margins finel)' elevated each 

 side, while in chalybaeiis they are con- 

 vex behind with a single strong margin 

 which is next to the upper side. 



The middle and hind tarsi are rather 

 thickly beset with long bristles ; the 

 claws are long and slender. 



In the $ the apex of the anterior 

 tibia is abruptly and strongly produced 

 inwardly and the spur is rather short; 

 there is a small tooth directed inwardly 

 behind the insertion of the tarsi ; the 

 inferior carination of the tibiae is armed 

 with three or four prominent teeth alter- 

 nating with finer ones, the hind thighs 

 are toothed at base. The 9 has not 

 been seen by me. 



The third and fourth joints of the 

 antennae are equal, fifth to eighth 

 gradually shorter aud thicker. 



In the preceding pages I have had all 

 of the species mentioned before me with 

 the exceptions of retusus and occident- 

 alis and I have freely availed myself of 

 the information given by Dr. Horn in his 

 paper. 



GEOTRUPES Latr. 

 Mycotrupes Lee. 

 G. retusKS Lee. Proc. Acad. iS66, p. 

 3^ 



iSi, 



Onychotrupes Jekel. 

 G. splendidits Fabr. Syst. Ent. p. iS, 

 no. 63. 

 miarophagjts Jekel, Monog. loc. cit. 



\). 611. 

 var. mixtiis Horn. Trans, v. i. p. 

 316. 



