176 JOHN B. SMITH. 



niaculation it resembles sequoice, but differs in the non-spinose middle 

 tibia. It is another of these intermediate forms that upset so many 

 and plausible systems. At first appearance it suggests an EUema 

 allied to comferarum. I have seen but a single imperfect specimen. 



It will be noted from what has been said above that while there is 

 a possibility of dividing the genus into certain arbitrary groups, yet 

 they are so closely related structurally and in ornamentation that it 

 is impossible to create any divisions of generic rank. 



In tabular form the scheme would appear as follows : 



1. Anterior and middle tibife spinose 2. 



Middle tibife not spinose 7. 



2. Dorsuni of thorax discolorous, blackish 3. 



Dorsum of thorax concolorous ; patagise edged or lined with black 4 



3. Primaries yellowish brown Icaliuije. 



Primaries fuscous gray, with a reddish tint ; costal region obviously paler. 



(Irupirorartiin. 



Primaries dark gray, costal region not paler; no discal spot....l>erologaiis. 



Primaries with white discal spot; with a fuscous tint; median band of sec- 

 ondaries somewhat indistinct gordiiis. 



Primaries without discal spot; with a brownish shade; secondaries yellow, 

 without median baud luscitiosa. 



Primaries gray, with costal region discolorous, pale; a submarginal black 

 streak on primaries albescens. 



4. Secondaries pale, whitish, banded with black 5. 



Secondaries concolorous ; brown 6. 



5. Costal region discolorous, paler; abdominal bands whitish vasliti. 



Costal region concolorous. 



A black edging to patagise, and a black line through middle of each. 



libocedrns. 



A black edging only to patagise; size very large chersis. 



Costal region slightly discolorous; size small; abdominal bands beautiful 

 creamy white iiisolita, 



6. Size large; a more or less distinct transverse band near base from which radi- 



ate heavy black marks pinastri. 



Size smaller ; no basal transverse band ; dark bluish gray; longitudinal dashes 



between all veins sequohe. 



Pale gray; with two longitudinal dashes only; very small <loIlii. 



Pale gray ; a fuscous oblique shade from inner margin, near base, to apex. 



coloradus. 



7. Secondaries white, with two narrow black bands elsa. 



Secondaries black, with two nari-ow white bands 8. 



Secondaries uniform brown or gray 9. 



8. Primaries without pale discal spot canadensis. 



Primaries with a gemmiuate white discal spot. 



Transverse maculation distinct Ingens. 



Transverse maculation obsolete ereniilns. 



9. Primaries gray ; with white discal spot ; secondaries blackish plebeius. 



Primaries brown ; without discal spot ; secondaries brown cnpressi. 



