NATURAL SCIENCES OF PHILADELPHIA. 327 



nearly to the tip ; apical portion reddish ferruginous. Hind wings dark gray, 

 with a fuscous patch near the base ; cilia pale fuscous. The niiile described. 



There is but little difference between this and the foregoiug species, either 

 in the perfect or larval state. The larva mines the upper surface of oak leaves, 

 in September. The head is dark brown ; the body yellowish green, with a 

 a double dark brown macula on the dorsum of the first ring ; vascular line 

 very narrow and dark green. A more careful observation than I have given 

 these insects may prove them to be the same, or the latter a variation. I have 

 but a few of each of them. The imago appears early in May, and a spring 

 brood will be found in early summer. 



Phyllocnistis Zeller. 



Head smooth, elongated above and clothed with imbricated scales. Front 

 with scales closely appressed, slightly retreating and broad at the clipeus. 

 Forehead or vertex, globosely rounded. Ocelli none. Eyes scarcely visible 

 in front and partially covered with scales. Antennae simple, one-third less 

 long than the anterior wings : basal joint scarcely with an eye-cap, somewhat 

 enlarged and flattened, but smooth and squamose. Maxillary palpi none. 

 Labial palpi very slender, and drooping (in the living insect they are ascend- 

 ing). Tongue very slender, naked and scarcely as long as the anterior coxae. 



The anterior wings almost caudate, the posterior lanceolate. In the 

 anterior wings the discoidal cell is acute behind ; the subcostal nervure sends 

 three short branches to the costa, and from the apex of the discoidal cell arises 

 a "branch furcate behind the tip, one of the nervulets proceeding to the costa 

 before the tip, the other to the inner margin. The median nervure sends two 

 approximated veins to the inner margin near the tip. In the posterior wings 

 the subdorsal is simple, ending in the tip, the median furcate near its mar- 

 ginal extremity. 



The head of the larva is thin, flat and circular, with the mandibles forming 

 an appendage in front on the median line similiar to some of the lithocolletes 

 larva?. The body tapers somewhat posteriorly with the sides of the segments 

 slightly projecting and flattened, with the general form rather cylindrical. 

 It is without feet or prolegs, and is very inactive, making little or no voluntary 

 movement when removed from the mine, and does not retreat in its mine 

 when touched. The body is somewhat viscid. 



The mine is a linear tract just wide enough to accommodate the body, long 

 and winding. The larva does not consume all the parenchyma of the leaf 

 along its tract, but simply separates the upper epidermis, so that it is not 

 transparent. When full grown the end of the mine is enlarged and the cocoon 

 woven in a little pucker of the leaf within the mine. 



The perfect insect is very sluggish, at rest carrying its antennae thrown back- 

 ward, but arched somewhat above the dorsal surface. 



P. vitegenella . Antenna? brownish silvery, fuscous at the tip. Head 

 and thorax silvery white. Fore wings silvery white, slightly golden toward 

 the tip, with a blackish dorsal patch on the inner margin near the base. 

 Somewhat behind the middle of the wing is a black oblique costal streak and 

 a black line curving from the costa to the inner margin. At the tip is a circu- 

 lar black spot, and before it on the costa two short, straight, black streaks. 

 At the extreme tip of the wing are two blackish, diverging streaks in the cilia, 

 with one of the same hue in the cilia beneath the apical spot nearly joining a 

 black hinder-marginal line ; cilia silvery. Hind wings silvery, cilia the same. 



The larva mines the upper side of the leaf of Vitia cordifolia and per- 

 haps other species, in September and October. The imago appears in Sep- 

 tember. 



Leucaothiza. 



Bead slightly hairy above on the vertex. The front smooth, covered with 

 closely appressed scales, broad, even beneath and somewhat inclined. The 



1859.] 24 



