Vol. XX'i ] ENTOMOLOGICAL NEWS 343 



gular hyaline spot on the anterior margin of the wing. The 

 comma mark by which Wiedemann named his species is missing 

 on E. clsa, that is, the hyaline portion of triangle beyond the 

 comma is infuscated on E. clsa. The ovipositor shows consid- 

 erable variation in both species, but in two respects the differ- 

 ences are permanent. The ovipositor of E. comma is smooth 

 and uniformly conical, that of Eurosta clsa is more or less at- 

 tenuated near apex and finely ridged transversely. 



Described from two males and five females. One male was 

 taken near Baltimore, Md., October i, 1899, all the others were 

 reared from galls collected at Richmond Hill, N. Y., in Octo- 

 ber, 1907, by Miss Elsa Schwensen and myself. 



The figure of upper left-hand corner of Plate X shows the 

 galls of Eurosta comma on the root of Solidago rugosa Mill. 

 The rest of the plate pictures Solidago juncca with the galls of 

 Eurosta elsa. Figures on plate all about half size. 



Notes on some Heliothid Moths. 



r.V T. D. A. COCKERELL. 



1. Rhododipsa masoni Smith. 



Some years ago my wife collected specimens of this species 

 at Boulder, Colorado, always on flowers of Gaillardia aristata. 

 The moth rests on the flowers so that the red wings are on the 

 red disc, and the yellow thorax is over the yellow rays, with the 

 result that although the insect is brightly colored, it becomes 

 practically invisible. I afterwards found that this habit was 

 known to Mr. J. Mason, of Denver, and Professor Gillette. 

 The type was, I believe, discovered through the picking of a 

 Gaillardia flower. 



2. Lygranthoecia brevis Grote. 



At Boulder, on August 3, I noticed that this species rests 

 upon the disc of Helianthiis lenticularis, and is admirably pro- 

 tected in this position by its color. It seems to me very close 

 to R. masoni, and I had taken it for a new form of Rhodo- 

 , but Dr. Dyar assures me that it is Grote's breris. Hoi- 



