THE CANADIAN ENTOMOLOGIST. 49 



mens of the fly and gall. Several flies were bred by him from galls which 

 he collected at Dolores, Colo., June 18, the flies issuing June 19. The 

 following is a description of the gall made by Professor Gillette at the 

 time : — 



Galls sub-globular in form, varying from }£ to }4 inch in diameter, and 

 borne singly along the side of the stems of Bigelovia. They are very 

 light in colour, being densely covered with a short white woolly hair. 

 Beneath this fuzz the substance of the gall is greenish in colour and quite 

 brittle. At the centre of each gall is a single larval cell containing, at this 

 date, the puparium of some fly. From the larval cell a burrow leads to 

 the woolly outer covering, which it never penetrates, and it cannot be seen 

 from the outside. The galls are very common. 



I have little to add to this description. The galls which I collected 

 measure (dried) from 8 to 1 1 mm. in diameter, the average being about 

 9 mm. The wool is extremely fine in texture. As before stated, they 

 were often approximated to each other on the same stem. Their form 

 seems to indicate more or less plainly a bud-like growth, and they very 

 often show the opening of the larval burrow on the outside. 



I have referred this trypetid to the sub-genus Eurosta, Loew, because 

 it seems to come nearest to this group of species, though it does not en- 

 tirely fit the characterization. The fifth vein is not bristly, scutellum has 

 only two bristles ; the front is what I should call very broad, perhaps not 

 ' : remarkably" so; the third antennal joint is short, but the ovipositor 

 seems to be somewhat flattened instead of conical. The following is a 

 description of the species : — 



Eurosta (Trypeta) bigeiovice, n. sp. $ . 



Wings do not resemble any figured by Loew in monographs ; they 

 are very pale at base, rest blackish fuscous, except the white reticulations, 

 and a slightly flavous portion near centre, and a little approximated to 

 costa, being situated in basal portion of submarginal, distal portion of first 

 basal and proximal portion of apical cells ; a white spot on costal mar- 

 gin before and just reaching the costal spine, before this an elongate 

 transverse white spot extending from costa back to posterior (second) 

 basal cell, and bordering on the pale basal portion of wing ; on costa in 

 marginal cell two white spots, the inner one just beyond and at extremity 

 of first longitudinal vein, the outer one more elongate transversely and 



