THE CANADIAN ENTOMOLOGIST. 137 



CANADIAN GALLS AND THEIR OCCUPANTS— EUROSTA 



SOLIDAGINIS, FITCH. 



liY WM. BKODIE, TORONTO. 



" Attacking the Solidago or Golden Rod." " Quite common in eastern 

 New York." " Slender, straight, smooth stalks of the Golden Rod 

 quite often have one and sometimes two large, round galls or ball-like 

 swellings upon them, an inch in diameter, when the stalk above and below 

 is less than a quarter of an inch." " In the winter season most of them 

 are found to be empty, with a round hole perforated in them, the worm 

 having completed its growth, and the winged fly having come out through 

 this perforation the preceding autumn. But occasionally one of these 

 balls is found at this season without any hole in it. In these the worm is 

 still remaining to complete its changes and continue its species the coming 

 summer." Fitch, ist N. Y. Report, 1855. 



Galls spherical, from i5-3omm. in diameter. Average of 50 

 specimens 23 mm.; on stems and panicle branchlets of Solidago, sp. ? ; 

 outside of gall hard and smooth ; colour pale straw ; interior uniform 

 white, spongy, dense ; larva occupying a small, irregular, nearly central 

 space j from i-io galls on a plant, usually 2-3. 



"This fly measures from 0.35 to 0.40 inch to the tip of the wings. 

 Its body is of a pale brownish-yellow or a tawny whitish colour with two 

 darker brown stripes above upon the thorax. The antennse, mouth and 

 legs are dull yellow, the face white, and the top of the head yellowish- 

 brown, with a blackish spot at base where the three ocelli or simple eyes 

 are situated. The wings are tawny brownish-yellow, with blackish clouds, 

 and with several dots and veins of a lighter yellow. On the outer margin 

 beyond the middle are two small triangular hyaline spots, and a third 

 longer one inside of these. A large transverse hyaline spot on the apex 

 and two large triangular ones upon the inner margin, the inner one being 

 larger and prolonged upon the margin of the base. Upon the margin of 

 the wing, in these large hyaline spots are some tawny yellowish dots or 

 small spots, namely, three in the apical spot, one in the small triangular 

 one, one or two in the larger triangular one, and three where this last spot 

 is prolonged in the axilla." Fitch, ist N. Y. Report, 1S55. 



" Brownish-ferrugineous with the head and legs more yellow ; front 

 very broad ; scutellum very convex, with two bristles. Wings reticulated 

 with fuscous having one limpid space at the costa and two at the posterior 



