NATURAL SCIENCES OP PHILADELPHIA. -167 



The hind wings are much narrower and shorter than the fore wings, emargin- 

 ate in the middle of the costa, hind margin obtusely pointed and very oblique. 

 The costal ends in the middle of the wing. The subcostal is attenuated to- 

 wards the base, thediscal gives rise to two nervules and the median is three- 

 branched, the superior and central nervules arising in a short common stalk. 



Head smooth, with hair-like scales. Face quite narrow. Ocelli none. Eyes 

 round and quite prominent. Labial palpi long and recurved ; the middle joint 

 rather slender, smooth with appressed scales, slightly flattened, longer than 

 the third joint, which is slender, smooth and pointed. Maxillary palpi none. 

 Antennae inserted on the front, basal joint smooth and subclavate, slightly 

 denticulated beneath and microscopically pubescent (in the tf alone ?). 

 Tongue scaled at the base and somewhat longer than the anterior coxae. 



This insect, I think, must approach very nearly (Ecophora of Zeller if it is 

 not, indeed, a member of that genus. 



C. argenticinc t e 11 a. Head, face and thorax deep reddish orange. 

 Labial palpi, middle joint dark brown, terminal white with a broad dark brown 

 ring on its middle. Antennae silvery white annulated with blackish. Fore 

 wings yellowish orange. Along the basal margin of the wing from the fold to 

 the basal angle, is a silvery line black margined on both sides, and one 

 from the basal third of the inner margin, somewhat curved and not extended 

 to the costa, likewise silvery and black margined on both sides ; the basal 

 portion of the wing included between these lines is deep reddish orange. Near 

 the apical third of the wing is a silvery costal streak, curved and tapering 

 outwardly, slightly dark margined on the costa behind. Opposite this on the 

 inner margin, is a semicircular silvery line, black margined on both sides at its 

 beginning, which terminates in a dark brown spot, white margined exteriorly, 

 at the commencement of the cilia, before which the line becomes grayish sil- 

 very. The portion of the wing included within this line, is deep reddish 

 orange, as well as the apical portion, in which along the hind margin is a row 

 of silvery spots each slightly dark margined. Hind wings fuscous. Feet 

 annulated with white. 



Nomia. 



Fore wings rather narrowly ovate-lanceolate, discoidal e'en very narrow, long 

 and unclosed, with two independent discal nervules to the hinder margin beneath 

 the tip. The costal nervure is short. The subcostal nearly straight, sending 

 three nervules to the costa from the cell, the first from the middle of the wing, 

 and its last branch bifid, with both branches above the apex. The median is 

 two-branched, the one nearest the base bifid near its end. The submedian is 

 furcate at its base. 



Hind wings narrower than the fore wings, costa nearly straight, but slightly 

 curved ; apex decidedly produced, with the hind margin deepty and circularly 

 excavated beneath it and the anal angle rounded. The discoidal cell is broad 

 and unclosed, with a short independent discal nervule beneath the middle of 

 the wing. Subcostal nervure simple. Median three-branched, the first de- 

 livered to the inner margin rather behind the middle, the last to the rounded 

 anal angle. 



Head smooth, with appressed scales. Forehead and face broad and round- 

 ed. Ocelli none. Eyes oval, not prominent, flattened. Labial palpi short, 

 somewhat reflexed, smooth, rather slender and pointed ; terminal joint ex- 

 tremely short, much slenderer than the middle. Maxillary palpi not percepti- 

 ble. Antenna? about one half as long as the fore wings, rather thick, but taper- 

 ing, roughened ; basal joint rather slender and short. Tongue slender, scaled 

 at the base, longer than the anterior coxa?. 



N. li n gul acell a . Head, face, and thorax, dark fuscous. Tegulae 

 golden. Labial palpi pale yellowish, terminal joint fuscous. Antennae dark 



I860.] 



