ON GEOTRUPES. 321 



not exist n good series in the collection of any one person or Society, 

 it would be well lor observers to turn their attention to a matter long 

 since neglected by the older collectors among us, while novices for the 

 most part care but little for investigation in material so unattractive as 

 that forming the natural habitat of these insects. 



Fig. 1 represents the form of antennal club called normal. The 



joints are all visible when the club is closed, there is no thinning of 



^Nj. the edue nor emari-inatiou at any part. A lateral or end 



'iU view shows the margins of all the joints. Their outline is 



/ ^vs£S> elongated oval, and as seen by the illustration arranged ec- 

 centrically. The outer joint has in many sjiccimcns two grooves ob- 

 lique to each other, sometimes uniting in a form resembling V. 



Fig. 2 affords an illustration of the al)normal antenna as seen in our 



species of Aiiop/nfnipfs. The second joint, in most of the specimens, 



shows a distinct emargination, in fact being reniform in outline. The 



tt%=^ r-\ rA outer joints are more or less thickened at a point cor- 



^J^::::^^ ^ rcspondlug to the emargination, so that when the club 



2 ^^^^ UsV is closed its form is preserved, and the touching of the 

 first and third causes the hiding of the intermediate joint at the point 

 of emargination. As stated in the body of the paper, this character 

 is subject to some variation. Fig. 3 will serve to give an idea of the 

 forms assumed, the spot in each being the point of articulation. 



Accompanying this character will be found another in a different 

 organ of the body. Fig. 11 shows the lateral margin of the elytra.' 

 The dotted line is the last stria extending in a very nearly straight 

 line from the humerus to the apex. Beneath this line is another some- 

 what sinuous, this is the true elytral margin. Near the humerus a 



, „ wide space can be seen. This is smooth, not striate, and but 

 sparsely punctured. The margin thus formed between the 

 L — -I^last stria and elytral edge appears more or less constant in 

 those species in which there is no sexual distinction in the apical tooth 

 of the anterior tibia, and is consequently found in no other North 

 American species save those of the subgenus Anojjcofrupcs. Fie. 12 

 shows the nearest approach to it in E(jrrkL 



The thickening of the middle tarsus in the group Oni/chotrupes, is 



^^^ shown in Fig. 4, which illustrates the middle tarsus of the male, 

 [[ either of splcndidus or acmurpacns. The spur of the tibia is 



much longer than the first four joints. The claws are much 

 thickened and rather suddenly recurved. 



TUA.NS. AMER. ENT. SOC. (41) JANTAUV, 1868. 



