THE SPECIES OF THANAOS. 1457 



Struck by the deceptive resemblance these hiberuacula of the banded purple 

 bear to the opening buds and curving terminal shoots of the very twig on 

 which they occur ; the color of the soft down of the buds and the envelop- 

 ing silk of the hibernacula is as similar as are their forms ; and this 

 mimetic resemblance is doubtless as effective as it is interesting. 



Table of the species of Thanaos, based on the imago*. 



Fore wiugs with subapical vitreous spots. Terminal liooks of upper organ of male genitalia 

 separate; blades of clasps long, especially on left side, when compared to the main body; 

 hind process of right clasp smooth. Costal fold of fore wings of male furnished with long 

 pediform bristles, curving at base, but with no flagellate or twisted audroconia. 

 Species of smaller size (wing expanse less than 38 mm.). Summit of upper organ of male 

 abdomen with no bristling crest; basal process of left clasp unarmed; the blade very 

 slender. Costal fold with many long, rod-like, subequal androcoula, sometimes two- 

 pronged, apically not twice so stout as at b.ise. 

 The dark spots of the upper surface of the wings neither well defined nor in striking 

 contrast to the ground color. Extremity of the blades of the male clasps only slightly 

 curi-ed ; pendant tooth of centrum reduced to a bristle. No apple-seed shaped an- 

 droconia in costal fold. 

 A large, somewhat distinct patch, paler than the ground color between the cellular 

 and subcostal vitreous spots of the fore wings. Process of left clasp of the male 

 slender and straght, almost as slender as the blade ; basal process of right blade 

 tapering nearly to a point. The smaller soaphiform scales of the costal fold often 



no more than twice as long as broad luciUus. 



A patch like that mentioned above, but faintly or not at all indicated by contrast. 

 Process of left clasp of the male broad and curving strongly, much broader than 

 the blade; basal process of right blade broadly rounded. The smaller soaphi- 

 form androconia rarely or never so short as above perslus. 



The dark spots of the upper surface of the wings well defiued and in striking contrast 

 to the ground color. Extremity of blades of male clasps bent strongly; pendant tooth 



of centrum stout. Many apple-seed shaped androconia in costal fold martialis. 



Species of larger size (wing expanse more than 40 mm.). Summit of upper organ of male 



abdomen with a distinct prickly crest ; basal process of left clasp armed with spinules ; 



the blade moderately slender. Costal fold with no rod-like, subequal audroconia, the 



nearest being much more than twice as |stout at tip as at base; the different species of 



this group show no distinction in androconia. 



Upper surface of fore wings flecked with whitish scales throughout, so as to be quite 



different in general tint from the hind wings. Crest of upper organ of male genitalia 



slightly elevated and bearing a vertical shield expanding apically ; lobe of right clasp 



dactylate, long, slender and free, curving inward juvenalis. 



No such difference as indicated above between the fore and hind wings, except in small 



patches. Crest of upper organ of male genitalia with the armiiture facing upward. 



Lobe of right clasp either very broad or not separate from the blade. 



No such patch as indicated below in any part of the wing. Crest of upper organ 



of male abdomen strongly elevated and surmounted by a horse-shoe shaped ridge ; 



lobe of right clasp greatly expanded, broadest apically horatius. 



A distinct patch, at the extremity of the cell and above it, paler than the rest of 

 the wing. Crest of upper organ of male abdomen forming a gibbous prickly pro- 

 tuberance; lobe of right clasp greatly expanded, broadest basally...terentius. 

 Fore wings with no subapical vitreous spots. Terminal hooks of upper organ of male genitalia 

 [ausouiust unknown] consolidated and stout ; hind process of right clasp [ausonlust un- 

 known] denticulate. Costal fold of fore wings of male [ausonlust unknown] with no pediform 

 bristles, but with either flagellate or twisted androconia. 



*The early stages of our many species of could readily be made for some of them. 

 Thanaos are insulficiently known for, any at- tAusonius will doubtless be found to agree 

 tempt at tabulation, though partial tables closely with martialis. 



