AMERICAN LEPIDOPTERA. 307 



Ischuoptera hyalina. 



Head pale testaceous, slightly obscured with reddish brown ; eyes 

 blackish; first two antennal joints testaceous, remainder brownish fus- 

 cus, delicately and sparsely pubescent; mouth parts pale testaceous. 

 Pronotal shield pale testaceous, the outer border paler. Tegmina near- 

 ly uniform pale testaceous, the costal border for nearly one-third the 

 length of the wing paler. Coxoe brownish fuscous; femora and tibias 

 pale testaceous ; tarsi, like the tibial spines, a little darker. Abdomen 

 blackish fuscous, darker posteriorly. Length of antennre 25 mm.; of 

 pronotum 4.25 mm.; breadth of pronotum 6 mm.; length of tegmina 

 21.5 mm. 



One % . Delaware. 



On the structural characters of POLYOMMATUS TAKQUINIUS. 



BY AUG. E. GEOTE. 



In this species the antennae are relatively short; the "club" long 

 and narrow. The head is well sized, held free from the thorax. The 

 labial palpi are long, well advanced beyond the front, divaricate, the 

 elongated third article slender and thinly scaled, curving slightly up- 

 wards. The thorax is large and full. The legs unarmed and thinly 

 scaled, moderate, the anterior pair more slender and shorter than the 

 middle and hind pairs. The wings are entire and ample ; primaries 

 triangulate ; secondaries rounded. The primaries are slightly arcuate 

 along the costa, straight along internal margin, rounded along the full 

 external margin which retires slightly before the determinate internal 

 angle. The anterior wing is dilated at its outer third ; the median 

 nervules well separated. The primaries have eleven veins or veinlets. 

 The costal vein is simple, joining the costa a little beyond the middle. 

 The subcostal throws off the 1st, 2nd and 3rd s. c. veinlets on the cos- 

 tal margin, these veinlets approximate and parallel in their course. 

 The 3rd s. c. is very slightly further removed from the 2nd than this 

 latter from the 1st, and is furcate before the margin, sending out the 

 4th s. c. outwardly to the apex of the wing.' The 5th s. c. joins the ex- 

 ternal margin and is widely separate from the 4th. The cell is not 

 closed; the independent vein simple and straight.^ Three median vein- 

 lets, the 1st and 2nd springing from one point, divaricate. The internal 

 vein is straight. The secondaries have nine veins or veinlets. The 



