62 Journal New York Entomological Society. [Voi. xviii. 



Explanation of Plate II. 

 (All the figures drawn under camera lucida.) 



Fig. I. Syrphiis pyrastri ^, from a specimen taken by the author at 

 Laggan, Alberta. Note the swollen frons, and the area of large facets, indi- 

 cated by the dotted line. 



Fig. 2. Syrphus seleniticus, c^, a European specimen sent me by Prof. 

 Bezzi. 



Fig. 3. Syrphus arciiatus (^, a specimen sent me from British Columbia 

 by Mr. B. G. Elliott. The demarkation of the area of facets is the greatest 

 I have noticed in this species. 



Fig. 4. Syrphus perplexus (^, a specimen taken at Searchmont, Ontario, 

 by Mr. E. B. Williamson. The line of demarkation of the area of enlarged 

 facets fades out on the lower border, the usual condition in this species and 

 arciiatus, when present at all. 



Fig. 5. Syrphus pyrastri $, a specimen from Seattle, Washington, taken 

 by the author. 



Fig. 6. Syrphus pyrastri (^, front view, same specimen as Fig. i. Note 

 the extreme width of the frons. 



Fig. 7. Syrplius seleniticus ^, front view, same specimen as Fig. 2. Note 

 the narrow frons as in other species of Syrphus. 



Fig. 8. Syrphus seleniticus,, wing, a specimen sent me by Prof. Bezzi. 



Fig. 9. Syrphus arciiatus, wing, same specimen as Fig. 3. 



STUDIES ON SYRPHID^.— III. AN INTERESTING 



MERISTIC VARIATION IN SYRPHUS 



PERPLEXUS. 



By Raymond C. Osburn, 



Columbia University, New York City. 



(With Plate III.) 



Meristic variations of different sorts have been recorded not in- 

 frequently among insects,* but as far as I have been "able to discover, 

 none have been noted u^hich involve the entire supression of a 

 compound eye and the presence of a complete supernumerary antenna 

 and vertical triangle v^'ith ocelli. 



The specimen which exhibits these conditions was sent me by Mr. 



* Especially Bateson, Materials for the Study of Variation. 



