178 zyg^nidtE and bombycid^ 



ZYGa:NiN5;. 



Genus HAKRISINA. Packard. 



Wings extremely narrow. Hind wings ovate-lanceolate, narrower 

 than the fore wings ; length much less than that of the body ; length 

 of the fore wings somewhat more than that of the body. The disc of 

 the forewings closed by a very faint, irregular vein, with hvo disco-cejitral 

 nervuks ; subcostal vein with a single marginal nervule from the pos- 

 terior end of the disc and with the apical branch 

 In'fid near the tip of the wing or bifid with a long 

 fork. Median vein four-branched, with the pos- 

 terior scarcely remote from the penultimate. Fold of the wing 

 thickened from the base to the tip. Submedian with a short fork 

 at the base of the wing. Hind wings without costal nervure ; sub- 

 costal bifid, with an oblique discal vein arising near the base of the 

 lower branch, and angulated above the medio- superior nervule, where 

 it receives the discal fold. Median vein four-branched, with nervules 

 nearly equidistant. 



Head rather small, free, smooth ; with large ocelli. Face smooth, 

 rounded, rather narrow. Eyes rather small, scarcely prominent. An- 

 tennae with bases approached, much shorter than the body, rather 

 deeply pectinated in the 3 , less pectinated in the ? . Palpi very min- 

 ute, filiform, drooping, with only two distinct joints ; terminal joint 

 acute. Tongue about as long as the thorax beneath. 



Body extremely slender, cylintlrical, not metallic. Patagia cylindri- 

 cal, minute. Abdomen without lateral tubercle, tufted at the tip and 

 along the sides. Legs extremely slender ; fore tibiae without tibial 

 spur : hind tibice with two very minute apical spurs.'' 



Clemens, Proc. Acad. Nat. Sci. Phil. i860. 



The characteristic colors of this genus are black, with bright colored 

 prothorax. The three species found in the United States may be tabu- 

 lated thus : 



Apical vein bifid with long fork. 



Prothorax orange. - - - - - - H. amerkana. 



Apical vein trifid near the tip. 



