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A New Genus and Species of Arctiidae. 

 By John B. Smith. 



Among material received some time since from Texas, by a number 

 of collectors as well as myself, were quite a number of specimens of a 

 pretty species of a Lithosiiform appearance. Its characters prevent its 

 association with any genus heretofore described. It resembles Emydia in 

 wing form, and Ocnogyna in tibial structure, while presenting peculiarities 

 of venation and head structure, which effectually distinguish it from either. 

 CERATHOSIA, n. gen. 



Body slender, graceful, untufted. Head distinct, rather prominent ; palpi slight, 

 reaching the middle of the front, the terminal joint minute. Tongue moderate in 

 length. Eyes hemispherical, prominent ; ocelli distinct. Antennae simple in both 

 sexes. Front depressed, excavated, with a circular sharp, somewhat irregular rim ; in 

 the centre of the depression is a cylindrical projection with a truncate and somewhat 

 cup shaped tip. Thorax ovate, with smooth, scaly vestiture. Abdomen elongate, 

 slender, cyhndric, smooth. Legs slender, smoothly scaled, increasing in length 

 posteriorly. Anterior tibia shortest, rather stout, with a moderately long, curved 

 spine at tip ; middle tibia with one pair, posterior with two pairs of spurs, not 

 spinulose. 



Primaries narrow, elongate, subequal, outer margin slightly oblique, arquate: 

 12-veined ; accessory cell present ; internal vein not furcate at base ; veins 3, 4 and 

 5 nearly equidistant from the end of the median ; 6 from lower margin of accessory 

 cell, 7, 8 and 9 on a short stalk from the end of accessory cell, 8 to the apex, giving 

 off 9 at about its middle ; 10 from upper angle of accessory cell. 



Secondaries large, rounded. Two internal veins : 2 from median at its outer 

 third ; 3 and 4 on a short stalk from the end of the median ; 5 wanting ; 6 and 7 

 from a short stalk at end of subcostal ; the costal, (vein 8,) from the. subcostal about * 

 from base. 



Supra anal plate of ^ triangular ; hook somewhat irregular, thickened in the 

 middle, with a pointed tip, but little curved. Side pieces subequal, with an obliquely 

 curved tip. 



C. tricolor, n. sp. 



Head, thorax, and primaries above, glistening pure white, spotted with black ; 

 secondaries and abdomen uniform glistening clay yellow. 



Palpi black tipped ; tip of frontal projection also black ; a black spot at the inner 

 base of antennae. Collar with a black dot each side of the middle ; thorax with four 

 black spots, two on each side of the middle ; patagiae with two black spots. 



Primaries with black powderings along costa, forming an elongate costal patch 

 at outer third, in which are three white costal dots. The black spots on primaries 

 are rather irregularly arranged, and variable : there is a series along the median vein 

 and another along the subcostal ; in some specimens there are two rather indistinct 

 transverse bands formed. At outer fourth is usually a sinuate, narrow, black trans- 

 verse line, often broken up into spots and sometimes not traceable as a line — there is 

 some difference too in the form of the line when it is present. A series of intra venular 

 spots parallel to and not far from outer margin always present : a series of terminal 

 lunules : fringe white. Secondaries and abdomen immaculate. Beneath, secondaries 

 and abdomen as above ; abdomen with a more or less complete series of narrow black 

 spots on each side of the middle. Legs white, black marked. Tarsi black or brown, 



