A REVISION OF THE DELTOID MOllLS SMIl'II. 3 



Tlie Willis are usually largo, but rarely frail, the two )»airs proi)or- 



tionate, or the posterior enlarging at the expense of the anterior, as in 



the typical Iljuwud. We have a predominance of i>ale yellowish or 



luteous tints in the Herniiniini, and of dark or dull brown hues, soiue- 



tiiiies with contrasting ^vhites, and with a tendency to elevated black 



sciiles in the iry))enini. The ornamentation is usually simple, freciuently 



consisting only (d' single transverse lines over a uniform base; but in 



some species variation apparently runs riot. The secondaries are always 



simply marked, usually nearly immaculate or with a. vague median and 



extra median line, never \vith any striking ornamentation or with a 



continuation of that of the primaries. The venation is normal in most 



instances; that is to say, in the ])rimaries the accessory cell is jtresent 



vein 5 is i»art of the series from the end of the me<liau vein, and there 



is a single internal vein, which is not, or but feebly, forked at base— a 



character of no real value to detiue a Noctuid. In the secondaries, vein 



5 is as strong or scarcely weaker than the others, and joins the median 



vein by an abrupt curve or bend a little before the forking of 3 and 4. 



No distinct cross vein is present in any species examined by me, and 



in all cases the origin of 5 is from the median without a break m the cou- 



tiuuanceof the vein. In the Herniiniini thereisastrong tendency to aloss 



of the accessory cell, and this increases in the aberrant forms, in which 



the Avings are angulated, which lack it as a rule. This is accompanied 



by a variation in the arrangement of the subcostal series of veins, and 



we may have 0, a stalk bearing 7, 8, and 9, and 10 from practically the 



same point at the end of the subcostal, or 10 may arise from the stalk 



bearing 7 to 9, wiiile in rare instances 10 arises more basally and from the 



subcostal before the end. These variations are usually of generic value ; 



but they must be cautiously used, for occasionally the accessory cell may 



be present or absent within the limits of the same genus. 



I have excluded from this series the genera PseHdorgiiia and Rivida. 

 I'scKdorgyia, in my opinion, has no real Deltoid affinities. The snout- 

 like palpi and the pectinated male antenuie are the only features that 

 can be relied upon; but those same characters occur in the little aber- 

 rant series of which Phipro.sopKs and Eucahjptera form a part, and the 

 antenmt of the former and palpi of the latter mark the sum of the 

 Deltoid characters. The palpi have the last joint drooping, and the 

 enlargement of the second joint is by downward vestiture, exactly as 

 in others of the series referred to. 



Rivula is more difllcult to deal with, because of its venation. It 

 lacks the accessory cell, and vein 10 of the primaries arises from the 

 subcostal precisely as in some of the true Deltoid genera; but on the 

 other hand vein ~> of the secoudaries is decidedly weak and is lost 

 basally in the texture of the wing or arises from a cross vein so weak 

 that no trace of it remains in the mounted wing, and that quite near 

 to the middle of the cell, though nearer to 4 than to 6, thus dilfering 

 from all the others referred to this group, and agreeing with the char 



