260 LEPIDOPTERA OF NORTH AMERICA. 



out a costal vein, and Zygaena has a costal vein bifid at the 

 base, and is connected with the subcostal by an intercostal 

 branch. 



The antennas are fusiform, sometimes pectinated, with 

 branches shorter in the ? than in the c^. The palpi are 

 short, cylindrical and hairy, or very short, almost rudimental. 

 The tongue is as long as the thorax beneath or almost want- 

 ing. Flight of the imago diurnal. 



ZYGAENA Fabr. 

 Anthrocera Scop. Intr. Hist. Nat. I, 414 ; Steph. ; Westw. 



Fore wings rather narrow and elongated ; their length exceeds 

 that of the body somewhat ; the tip of the wing is rounded and 

 the hind margin obliquely rounded ; the inner angle rounded and 

 nearly opposite the middle of the costa. The subcostal nervure, 

 or vein, and the median are adjacent in the basal third of the wing 

 and diverge thence to form a markedly fusiform disk placed above 

 the middle of the wing, and which reaches to the apical third. 

 There are five subcostal nervules, the first arising near the middle 

 of .the disk, and the two others adjacent to each other at the pos- 

 terior-superior angle of the disk; the third nervule, viz., the apical, 

 is bifid from its middle, and from its origin the subcostal curves 

 downward throwing off two nervules to the hind margin. The 

 discal vein is short and angulated, and receives the discal fold. 

 The median nervure is 4-branched, and curves upward from the 

 medio-posterior branch, which arises at a point about midway be- 

 tween the first and second subcostal branches, to join the discal at 

 the angle which receives the discal fold. The fold of the wing is 

 thickened, and the submedian nervure is simple. 



The hind' wings are somewhat more than one-half the length of 

 the fore wings ; irregularly ovate, dilated at the inner angle. The 

 disk is broad, irregularly fusiform, and extends to the apical third 

 of the wing. The costal nervure is bifid at the base of the wing, 

 and is connected with the subcostal at its middle by a minute 

 intercostal branch; from this point the subcostal departs obliquely 

 and divides into two branches at the end of the disk, the lower one 

 being angulated. An oblique angulated discal nervure at the 

 angle of the lower branch, receives the discal fold. The median is 

 4-branched, curving upward to join the discal from the origin of 

 the posterior nervule. 



