The Scottish Naturalist. 21 



MEMOIRS ON SCOTTISH DIPTERA. 



By JAMES HARDY. 



No. V.-TEYPETA ALTEENATA Fallen. 

 (The Rose-hip Fly). 



"DOUCHE, as we are informed by Mr. Westwood ("Intro, 

 to Ent," ii. 573), reared, Trypeta continna Meig. (T. 

 altcmata, Fall.y), from the berries of Rosa villosa. I am able 

 to confirm this account of the habits of the insect, having during 

 the autumn detected the maggot devouring the ripe hips of 

 Rosa tomentosa, var. scabriuscula, and Rosa canina ; the former, 

 at best, but a doubtful variety of R. villosa. The hips get 

 black and corrupted on the sides, and shew the openings by 

 which the maggots have gained access. They appear not to 

 confine themselves to single fruits, and readily enter a fresh one 

 when presented to them. I obtained them in a pupa state 

 shortly after collecting the hips, which they deserted previous 

 to entering into that condition. The puparia were mostly 

 cemented to the object on which they laj, by a moisture that 

 had exuded from the vent. The hips of Rosa spinosissima 

 are similarly damaged, but I was too late in ascertaining 

 whether this was attributable to the same cause. The maggots 

 were found on the 1st of November, and the fly was not dis- 

 closed till the 23d of June, in the subsequent spiing. The 

 maggots first appear about the end of September. 



The maggot is yellowish, shining, smoothish, thickish, convex, 

 a little tapering in front and less behind, the breadth at the 

 middle being nearly uniform ; the segments distinct, the division 

 lines crenated ; the upper part of the second anterior segment 

 is roughish above ; and near its base, on each side the stigmata 

 come out in a bilobed white furcate scale ; hinder end a little 

 rounded and narrower, with a pair of approximated, not 

 raised, stigmata, which are composed of three divisions, and 

 have a narrow depression between them ; the tip behind 

 rounded ; the anus a cleft ; the middle part of the ventral 

 segments slightly wrinkled ; length 2^ lines. The specimens 

 from the dog-rose (R. canina) were whiter, the divisions of the 

 segments scarcely crenate ; the hinder stigmata more elevated, 

 a minute tubercle on the outer edge of the area beneath them, 



