A REVISION OF THE DELTOID MOTHS — SMI'lII. 31 



Z.obucurijH'iini.s is\-ery close to Z.erurali.s, but it is diirkci' niul more 

 obscurely marked. The transverse posterior line is simihir in ^^eneial 

 course, but is nuicli less evident and isirre.iiiilar, soniewiiat denticulate, 

 not even. These characters are readily noted and the nature of the 

 transverse posterior line is usually decisive of the species. 



Z. j)r<>ti(i)nios<(I-is, better known as Z. minimaliis, is another dark spe 

 cies much like Z. ohsciirijuiniis at tirst sight; but it differs in the iriegu- 

 lar transverse anterior line, and the j^et more denticulated transverse 

 posterior line. In the character of the transverse anterior line this 

 specii's differs from both Z. eriirdli.s and Z. obsviiripennis, but agrees 

 with Z. )ii<nci<1ilinea iu\d Z. ochreipenitis, from which it differs by its 

 smoky or blackish color. 



Z. iiKirridiliiicd and Z. ocJinijx'Hxi.s are yellowish or luteous forms ;ind 

 are very closely allied. Sui)erticially, Z. marcidiliitca is smoother, more 

 evenly colored, and the median lines are less irregular; while in Z. 

 oclireiptninis the vestiture appears rough and powdery, there is a dis- 

 tinct teiulency to a darkening of the outer part of the wing, and the 

 median lines are more denticulated, sometimes, ni the transverse poste- 

 rior, almost crenulated. 



AXAI.VSi;s (IF IHK SPIX'IES OI' ZAXCI.OON Ain A. 



1. Median lines dilated on the oo.sta, forming more or less prominent triangnjar 



spots 2. 



Median lines nnil'orm. not dilate<l on the costa 4. 



2. Primaries with a brown or blaek patch at apex, following the snbterniinal 



line; costal jiatehes at inception of median lines prominent; gronud 



color Inteous or Ijrownish litcralis. 



rrimaries withont a dark apical spot ; subterminal line simple or preceded by 



a dusky or blackish shade 3. 



3. Ashen gray; the median lines slender, starting from obvions costal spots; 



transverse posterior line with an abrupt outward bend below the costa, 

 close to and usually almost parallel with subterminal line tiikkalis. 



Ashen'gray; the median liues broad, somewhat diffuse, scarcely enlarged to 

 form costal spots; transverse posterior line evenly ontcnrvod, more 

 remote from subterminal line, sinuate mixdkai.is. 



Dhil smoky gray or fuscous; median lines narrow, slightly enlarged at their 



inception; transverse posterior line sinuate ixcoxspicrAi.ls. 



4. Subterminal line sinuate; all the nuiculation distinct. 



Transverse anterior line rigid or with a slight inward bend ; sulitern\inal 

 line not marked by preceding spots i,.i;\ kia i\. 



Transverse anterior line evenly outcnrved; sul)terminal line luuulato as 

 well as sinuate, prect^ded by a series of black spots. \\ hieh arc iuwaidly 



diffuse iMxcTiFoimis. 



Subt(;rminal line rigid or uearlj' so; pale ."). 



5. Transverse lines broad, diffuse, contrasting; a black sh.Tde i)reeeduig the sub- 



terminal line ATUii.iXKi'.Li.A. 



Transverse lines slender, narrow, not contrasting ti. 



6. Transverse anterior liue eveu, not denticulate or marked on the veins, save 



that there may l)e an angulati(ui over the costa 7. 



Transverse anterior line slender, irregul;ir, dentate or outcnrved in the inter- 

 spaces !». 



