A REVISION OF THE DELTOID MOTHS SMITH. 113 



sexes, SiiN'e that the iiiide luis the priinaiies distinctly brouder and is 

 always nuieli more evenly colored, without eontrastinji: lines or shades. 



The j^eniis is an easily distinguished one in our launa. Tlie only 

 other narrow winj^cd genus we have is FlafhypcuK, and in that tlu; palpi 

 are decidedly shorter, ol)]i(iue in the male, while the latter sex is also 

 very mu(di more robust and has woolly clothing beneath. Finally the 

 wings have the inner margin sinuate and the anal angle marked oi- a 

 little produced, while in Hiuhim the margin is even and the angle obtuse, 

 or at least not at all prominent. 



All the species are marked by tufts ol' elevated scales indicating the 

 ordinary spots and by an additional little patcth below the median \'ein 

 and at about the middle of the median space. 



As thus restricted we have four species of Hi/pcna, one of them new. 



At the head I place H. humali, au old friend, which differs from all the 

 others by the even outer margin of the primaries, no trace of any angu- 

 lation occurring in any specimen. The spec-ies is further distinguished 

 by having a sinuate transverse i)osterior line, distinctly outcurved over 

 the reniform. In this it agrees with Plathi/pnui scabnt^ but differs 

 from all its congeners. 



The transverse posterior line, by the bye, furnishes an exceedingly 

 useful and reliable character for the recognition of vspecies in this 

 genus, being absolutely constant, always distinct in the female, and 

 usually also in the male. 



H. modesta is a new species, which has been probably confused with 

 //. caUfornica. It is of a quiet color, jjowdery, in the male almost a 

 uniform pearl gray, in the female a little more reddish, with better 

 defined markings, the subtermiual space with a markedly blue-gray 

 tinge, which can scarcely be called contrasting. The transverse pos- 

 terior line is rigidly obli(|ue, without curve, bend, or angulation to the 

 submediau interspace, where it is inwardly bent, forming a tooth on 

 the internal vein. 



H. mlifornicais decidedly larger, always reddish or darker brown, in 

 the female with sharp contrasts against the yellow base, the pale colors 

 all yellowish and never bluish. The transverse posterior line, while 

 much the same as that of H. modesta as a whole, is irregular, a little 

 denticulated <ni tlie veins and curved in the interspaces; while the 

 inward tooth on the internal vein is much deeper and more acute as a 

 rule, to which, however, there are frequent ex<;eptions. II. decorata 

 nearly or quite equals H. caUfornica in size, but is of a yet richer and 

 deeper brown, with little admixture of yellow, and the subtermiual 

 space shot with bluish; the contrasts in the female being bright if not 

 strong. The transverse i^osterior line is even, a very little sinnated to 

 the subnu'dian iuters])ace where it forms an (uitward tooth, followed by 

 one of ecjual length inwardly on the internal vein. It thus differs from 

 both those previously mentioned by the outwjird tooth al)ove the inward 

 one. 



7802— No. \6 8 



