A REVISION OF THE DELTOID MOTHS SMITH. 27 



whicli the outer is pale and sli^yhtly dentate. A broken, black teiininal 

 line, followed by a yellow line at the base of the frinf>es. Beneath, 

 jtowdeiy, the wing's crossed by three very variably distinct transverse 

 lines, of which the outer is more or less denticulate. 



Expanse of Avings, 10 to li8 nnn. O.IT) to 1.12 inches. 



Habitat. — Eastof the Kocky ^Mountains : northern and eastern range, 

 rluly to Se{)teniber; south and s()uth\A-est. March to November: Colo 

 rado in September. 



This is a common .species, witli quite a range of variation in size, and 

 a considerable variation in the distinctness of maculation. Tlie greatest 

 contrast is shown in the reniform spot, which, while normally yellow, 

 is sometimes in\aded by the median shade, and becomes occasionally 

 black and quite strongly marked, differing prominently from the more 

 usual form. Sometimes forms occur in which all contrast is lost and 

 they are then almost uniformly gray and powdery. The antenna^ of the 

 male have the usual long lateral bristles, and below these a well-marked 

 pectination or process of moderate length, considerably exceeding 

 those of E. americalis, but, like them, clothed with tufts of sensory hair. 

 There are no supplementary lateral tubercles as in the allied species, 

 and the pits on the underside of the joints are less numerous. In the 

 fenuile the antenuic have the usual slender lateral biistle and the under- 

 side of the joints are marked with sensory pittings. The scaly mark- 

 ings so distinct in E. a)iicric((lis are here barely traceable. The sexual 

 characters of the male are well nuirked. The harpes are narrowed at 

 the middle and drawn out, and the tip is rather irregularly rounded. 

 The daspers arise from a stout base and are attached to the harpes to 

 the nuddle, whence they are separate as stout, slightly curved, cyliw- 

 drical, and pointed prongs. The species thus differs throughout from E. 

 am ericaUs, of which I was at one time inclined to consider it a variety, 

 deeming the form now separated as E. majoralis to be an intermediate 

 type, whicli indeed it is, so far as maculaticm alone is concerned. 



Genus ZANCLOGNATHA, Ledena-. 



IS")?. Lederer, Noctiiiueu, Kiiropas, 211. 



I'ilj/olita, (iiote. 

 1S73. (irote, Bull. Euff. Sot-. Nsit. Sci., I, 39. 



CleptomUa, Grotc. 

 1873. Grotc, Trniis. Am. Kutoinoloiiical Soc, IV, 301. 



Mcfiachi/ta, (irote. 

 1873. (irote, Trans. Am. Kiitoniological Soc, 1\', 30t). 



Eyes naked, large, globose. Front smooth, in perfect examples with 

 a pointed tuft between the antenna': but this is a variable and often 

 defective feature. Tongue long and stout. Antenna' nmderate in 

 length, arising from the vertex, close to the compound eye. the basal 

 Joint enlarged, much stouter than the remaindei- of the stalk: l»ut the 

 dilation much less marked m the female. In the male the antenna' are 

 furnished with lateral bristles on each joint, and at about on<'third 



