REHN AKD HEBARD 59 



(Rehn and Helxird; in tleacl leaves and scattered green under- 

 growth in chestnut forest.) [Hebard Collection, Type no. 399.] 



This species can be readily separated from the allied testaceus 

 and pachijmerus by the following characters. From l)oth the 

 older species the male can be readily distinguished by the shorter 

 pronotum and the much reduced area of the disto-dorsal section 

 of the tegmina. From testaceus the male of davisi is also readily 

 distinguishable by the more slender cerci, while from the same 

 sex of pachymerus it is also separated Ijy the slightly more pro- 

 nounced humeral sinus, the shorter and more robust caudal 

 femora, narrower pronotal disk and less attenuate cerci. The 

 female of davisi can be distinguished from that sex of both 

 testaceus and pachymerus by the relatively shorter pronotum 

 and more deeply divided subgenital plate, while from testaceus 

 it can also be separated by the more angulate sections of the 

 subgenital plate, the generally narrower ovipositor and the more 

 sharply attenuate distal portion of the caudal femora, and lastly 

 from that sex of pachymerus the female is separated in addition 

 by the less elongate caudal limbs. 



From monticola the present form can be distinguished by the 

 somewhat less prominent eyes, by the less sigmoid lateral angles 

 of the disk of the pronotum, which are straighter and more reg- 

 ularly divergent caudad in davisi, by the less decided contrast 

 between the inflated proximal portion and the slender distal 

 portion of the caudal femora, by the straight or at least straighter 

 ovipositor and the narrower and V-emarginate subgenital plate 

 of the female. More material may show the two forms davisi 

 and monticola to be geographic races of the same species, the one 

 of the southern Appalachians and the other of the northern 

 portion of the same and adjacent systems and portions of the 

 Piedmont region. As intermediates would be expected in the 

 mountains of Virginia, we have made a careful examination of 

 the few specimens available from that general region, but we 

 have no positive evidence of intergradation, except that the 

 female of monticola from Washington County, Virginia, has the 

 subgenital plate less broadly U-emarginate, but it is without the 

 least doubt monticola. The northern davisi is, apparently, in 

 process of ))rcaking up into at least two forms, not however, 



TRANS. AM. ENT. SOC, XLII. 



