NATURAL SCIENCES OF PHILADELPHIA. 239 



the first radial area ; it emits a tawny branch, which follows the central and 

 great cross-veins ; the apical portion of the wing is variegated with several 

 tawny and brown spots, lines and bands. 



Washington, in August, (nob.) Compared two $ specimens. 



L. pavonina. Thoracis disco pallide cervino, basi antennarum fusca; 

 alas annulis maculisque fuscis. Long. lin. 4. 



Proboscis and palpi brown ; front and* vertex yellowish-sericeous ; antennae 

 yellow, first joint brown. Praescutum whitish-yellow with a reddish brown 

 margin ; brown spots near the humeri ; pleura yellowish-sericeous with an 

 indistinct pale brown band ; metathorax brownish yellow ; halteres pale ; base 

 of the knob infuscated ; feet yellowish tawny ; tips of femora and tarsi brown. 

 Abdomen tawny, infuscated at tip. Wings with yellowish-brown spots and 

 ocelli, the margins of which are darker brown ; one incomplete ocellus near 

 the base, between the costal and pobrachial veins ; another complete one has 

 the origin of the petiole for its centre, and is connected by an ocelliform spot 

 with several brown spots on the posterior margin ; next comes a brown band 

 formed by several imperfect and confluent ocelli and running from the ante- 

 rior to the posterior margin ; this band encloses several pellucid spots, espe- 

 cially in and around the discal areolets ; the tip of the wing is occupied by 

 one circular brown spot at the base of the petiolated areolet ; another, oblong 

 spot, between it and the anterior margin, and several (five or six) irregular, 

 contiguous spots at the tips of the veins, between the radial and pobrachial ; 

 all cross-veins, especially the supplementary cross-vein of the costal area, are 

 infuscated. 



Single $ specimen from Illinois (Mr. Kennicott.) 



8th Section. 



(Subgenus Prionolabis nob.) 



Body and feet stouter than in the preceding section ; the latter hairy. 

 Wings of moderate length and breadth. Neuration somewhat like Meig. vol. i. 

 tab. iv. fig. 20 ; or Schum. tab. iii. f. 7. Antennae not reaching the base of 

 the wing ; basal joint cylindrical, long ; the second short ; the following sub- 

 globular, elongated towards the tip of the antennae ; pubescent with short, sparse 

 hairs; no verticils are apparent, (^forceps with a pair of large, flat, horny ap- 

 pendages, which are serrated on the inside (fig. 27.) $ ovipositor with long, 

 slender, straight valves, which are very slightly arcuated towards the tip. 



L. rufibasis. Cinerea, halteribus pallidis, alis pallide fusco-fiavescenti- 

 bus ; stigmate obscure fusco ; venulis centralibus et vena pobrachiali fusco- 

 nebulosis ; pedibus fuscis, femorum basi pallide ferruginea ; long. lin. 4-4f . 



Head cinereous ; palpi and antennae brown ; third joint of the latter faintly 

 rufescent. Thorax cinereous ; stripes obsolete, pleurae hoary ; halteres pale 

 yellow ; feet brown ; coxae cinereous, base of femora pale ferruginous. Ab- 

 domen blackish cinereous ; horny parts of the genitals ferruginous and 

 brown ( 9 forceps fig. 37.) Wings yellowish, slightly infuscated; subcostal 

 and mediastinal areae with a yellow tinge, as well as the veins enclosing them ; 

 the other veins brown ; stigma dark brown, oblong, central cross-veins, pobra- 

 chial vein and origin of petiole clouded ; the portion of the radial vein prece- 

 ding the fork, and that of the cubital vein preceding the central cross-vein, 

 are of about the same length with the latter ; two stigmatical cross-veins is 

 not far from the tip of the subcostal vein, and about the middle of the upper 

 branch of the radial fork. 



Six specimens (four ^ and two ?.) Washington (nob.) in April; New 

 York (Dr. Fitch) ; Mass. (Mr. Scudder.) 



The cinereous color of the thorax seems to be due to a microscopic pubes- 

 cence on a black ground. 



1859.] 



