THE CANA.DIAN ENTOMOLOGIST. 145 



that these invaders will prove of better staying qualities than those who 

 crossed the border in '66, and turned to the right about at Ridgeway, 

 because Canada was not the " clover patch " they were looking for. 



LIST OF SYRPHID^ TAKEN IN FAIRMOUNT PARK, 

 PHILADELPHIA, PA., DURING THE SUMMER 



OF 1884. 



BV E. L. KEEN, PHILADELPHIA, PA. 



The species in the following list were taken in Fairmount Park during 

 the past summer, and mainly during May and June, which is the best time 

 for Syrphidse ; then there are some which only appear in the fall months. 

 Of all families of Diptera the Syrphidse seem to be better represented in 

 the Park than any other families of this order, perhaps with the exception 

 of the Dolichopodidae. The Syrphidae seem to prefer damp and somewhat 

 open woods, especially a small wood that has a small rivulet running 

 through, near the border, and where there are patches of May apple, with 

 the sun shining through the trees on the plants. This only applies to some 

 species, for others prefer the borders of woods, fields, etc. I never found 

 many Syrphidae in a hot and sandy county, for instance like New Jersey, 

 but what it lacks in Syrphidae it makes up with the Bombylidae, for last 

 summer I took about ten species of the latter family in one day, while 1 

 only took about seven species the whole summer in Fairmount Park. 



The present list does not represent all the species found in the Park ; 

 it only includes the collecting of the earher part of the summer, for during 

 the fall months I did little or no collecting. 



Paragus bicolor, Fab. Quite common during July and August. 



II tibialis. Fallen. n n m m 



Pipiza femoralis, Loew. Very rare ; took one specimen May 3rd near a 

 small creek. 

 II albipilosa, WilHst., n. sp. Rare; two specimens May 15th in damp 

 woods. 

 Chrysogaster nigripes, Loew ( = Orthoneura ustulata, Loew). Not very 

 common. 

 II nitida, Wied. All summer. 



