1866.] 21 



g i b b s u a, but the apical tooth of the clypeus is central, and therefore is not 

 produced by wearing from a bidentate form ; the transverse carina is less ele- 

 vated. On the elytra the rows of punctures are somewhat more regular and 

 smaller than in the specimens from the Atlantic States. The fovea behind the 

 anterior acute tubercle of the thorax is rounded and densely rugous, while in all 

 the species of division A it is polished. The maxillae are distinctly visible in the 

 specimen, and their galea is obviously tridentate at tip. The form of the stridu- 

 lating organs and the sculpture of the propygidium is precisely as in the other 

 species. 



2. Thorax without anterior fovea and acute tubercle ; anterior tibiae 



8ub-4-dentate. 



5. L. rel ictu s, nigro-piceus oblongus, capite leviter rugose punctato, cly- 

 peo antice bidentato, transversim carinato, carina medio interrupta, tborace 

 parce punctato, lateribus rotundato, elytris linea suturali, alterisque 8 punctatis 

 per paria approximatis, interstitiis alternis punctis plus minusve confusis notatis, 

 pygidio parce punctato, ad basin subtililer rugoso. Long. -7 '9. 



Scarabcem relictus Say, Journ. Acad. Nat. Sc, 5, 194, 



Heteronychus relictus Burm. Lamell. 3, 92. 



Bolhynus relictus Lee. Journ. Acad. Nat. Sc. 2d ser. 1, 87. 



Middle and Southern States, and Kansas as far as the Rocky Mountains ; those 

 from the latter locality are smaller than those found in Pennsylvania. Slight 

 differences are observed in form in this species ; females occur usually of a regu- 

 lar oblong form like the males, but occasionally they are quite considerably 

 ovate. 



In the other species of the genus I have been able to detect no sexual differ- 

 ences ; here, however, the inner claw of the anterior tarsi of the male is thick- 

 ened, dilated and suddenly curved. 



L. r u g i c e p s, oblongus, nigro-piceus, capite valde rugose punctato, clypeo 

 antice bidentato, transversim carinato, carina medio interrupta, thorace parce 

 punctato, lateribus rotundatis, elytris punctis densioribus sicut in priore insculp- 

 tis. Long. -55. 



Two specimens without any abdomen, from Georgia. Very closely resembles 

 the preceding in form and sculpture, but the size is so different that I cannot 

 consider them as the same species. The only specific differences I can find, 

 however, are the more strongly rugose head and more densely punctured elytra. 



Aphonds Lee. 



This genus contains species agreeing with Ligyrus in every respect, except 

 that the elytra on the inner surface are not furnished with stridulating plates, 

 and the mandibles are not dentate externally ; to avoid, however, the necessity 

 of raising the elytra, recourse may be had to the structure of the head, which is 

 narrowly margined, hardly transversely carinate just b-efore the eyes, but at 

 most furnished with a slight tubercle ; the tip of the clypeus is varied in form ; 

 in the first division the tip itself is elevated, and immediately behind it is a sharp 

 transverse elevated line, which is either uniform or tridentate. In the second 

 division the tip is rounded, and the elevated line is strongly bidentate. 



The species of the first division are of a very short ovate convex form ; the 

 mandibles are not prominent, the antennae are 10-jointed, the 6th and 7th joints 

 wider than the preceding ones ; the one forming the second division is, however, 

 only moderately dilated behind, the mandibles are more prominent, and the fifth 

 and sixth joints of the antennae are of the same size and closely united. 



I. Thorax not foveate near the apex, 



A. Pygidium moderately convex ; last abdominal segment hardly finely margined, 



1. A. p y rif o rm i s, breviterovatus, obscure ferrugineus, capite confertim ru- 

 goso, vertice medio obsolete tuberculato, fronte ad apicem truncata, mox pone 



