Tineina of the Central United States. 113 



heing most distinct on the under, instead of the upper side. It is in- 

 dicated on the upper side only by a slight mamillary bulge, the paren- 

 chyma not being removed, while on the under side the cuticle is loos- 

 ened and the parenchyma eaten over the whole mine. The imago emerges 

 through the under surface. In all these respects it is in marked con- 

 trast with the species described below, and which is nearly allied to it 

 iu many respects. 



I have also received from Miss ]\Iary E. Murtfeldt, of St. Louis — to 

 whom I am under many obligations for "Micros"— specimens which I 

 believe to belong to this species, and which only differ from it by being 

 a little paler and less dusted. Miss Murtfeldt bred them from mines in 

 the leaves of Ambrosia artemisifolia, one of which she sent to me. This 

 mine is at the edge of the leaf, while in A. trifida the mine occurs any- 

 w-here on the leaf ; and the species from artemisifolia emerges through 

 the edge of the leaf, instead of from the under surface, nevertheless, I 

 think it is the same species. 



T. heliopsi sella (n. sp.) 



This species, while closely allied to the preceding, differs from it 

 strikingly in some respects. It also mines the leaves of A. trijida, and 

 also those of Heliopsis kevis. The mine is of irregular outline, ap- 

 proaching the circular or ovate form, and larger than that of amhromeella. 

 It is placed anywhere in the leaf ; the parenchyma is entirely 

 eaten out, except from the under surface of the nidus, which is 

 most distinct on the upper surface. The imago emerges from the upper 

 surface. The mine is sordid whitish, and the nidus is indicated on the 

 muler surface by a mamillary bulge. The insect, though similarly 

 colored, is decidedly distinct from amhrosicEeUa, besides being larger, 

 measuring three eighths inch in o/. ex. In Kentucky it is found at 

 the same seasons w4th amhrosiaxUa, which it resembles, but is more dis- 

 tinctly marked, and more densely dusted. 



The two anterior pairs of legs are dark brown on their anterior sur- 

 faces ; the third pair is yellow, with the tihVi marked with brown on the 

 outer surface, and the tarsi dark brown annulate at the joints, ivith yelloio; 

 the venter is deeper yellow, and tinged with fuscous at the margins nj the 

 segments ; the palpi and head are ocherous yellow, and the tuft (m the 

 vertex is a little Hecked with brown. The thorax and anterior wings 

 are deep ocher yellow, with golden reflections in some ligiits ; the 

 thorax is dusted with dark brown scales, with a dark bromi line from 

 the anterior margin to the tip, and another over the tegidce, passing back 

 along the base of the dorsal margin of tiie fore wings; the fore wings are 



