368 ACADEMY OF NATURAL SCIENCES 



the interno-medial nervure have each a spot at tip : the two eross- 

 nervures margined : tergum more dusky at tip, with an obsolete 

 blackish dorsal line, and posterior margins of the segments. 

 Length one-fifth of an inch. 



[Continuation from vol. 6, 1830, pp. 183 — 188.] 

 ORTALIS Fall. 



1. 0. MARGINATA. — Nervures margined with fuscous. 

 Inhabits Indiana. 



Body dull honey-yellow : front somewhat fulvous : hypostoma 

 with a black line under each antennae : thorax yellowish-gray, 

 with two dorsal black lines, exterior to which are three abbre- 

 viated lines : scutel imniaculate : wings with the nervures mar- 

 gined with fuscous ; costal margin fuscous, with a whitish spot 

 near the base, extending into a band, another hyaline spot before 

 the tip : pleura honey -yellow : feet pale, tergum black ; first and 

 second segments chiefly honey-yellow; remaining segments gray 

 at base. 



Length three-tenths of an inch. 



Closely allied to the genus Platysoma, and is a fine species. 



2. 0. LIGATA. — Wings quadrifasciate with fuscous. 

 Inhabits Mexico. 



Body blackish : head ferruginous, tinged with glaucous be- 

 hind and on the vertex : thorax blackish-plumbeous : wings 

 white, subopake, with four fuscous [184] bands; the first a little 

 oblique, across the neck of the wing ; second from the tips of the 

 mediastinal and postcostal nervures, and proceeding a little 

 obliquely, so as to be bounded posteriorly by the middle cross 

 nervure ; third, perpendicular to the costal margin, and covering 

 the posterior cross nervure ; fourth, terminal, slightly connected 

 on the costal edge with the third : poisers white : tergum coppery- 

 black : feet black ; knees and tarsi ferruginous. 



Length three-twentieth of an inch. 



3. 0. TRIFASCIATA. — Wings hyaline, trifasciate with fuscous. 

 Inhabits the United Sates. 



Head blackish-rufous : thorax brassy, polished : scutel rather 



[Vol. VI. 



