AMERICAN DIPTERA. 393 



DASYPOGON. 



Dasypogon Meigen, Illig. Mag., II, 270, 1803. 

 In the restricted sense this genus does not occur in North 

 America. Several species have been described under this 

 genus in the old sense, and have never been identified. The 

 only ones recorded from the United States are :— 



Dasypogon quadrinotatus Bigot, Annales, 1878. Cal. 



Dasypogon (Seilopogon) rubinosus Bigot, Annales, 1878. N. A. 



EXPLANATION OF PLATES. 



The figures on the Plates III, IV, V, were made with the camera 

 lucida; those on Plate II are free-hand sketches. The photographs 

 were taken in the Insectary of the Massachusetts Agricultural College. 

 A Dallmeyer lens was used. As the photographs are not equally en- 

 larged, the magnification will be stated in the following list. The 

 author regrets that many of the finer details of antennas, bristles and 

 hairs have been lost in the necessary reduction of the original plates 

 VI to X. 



The plates are by the author. 



PLATE II. 

 Fig. 1 — Asilid wing. 



1 — costal vein. 



2 — axillary vein. 



3 — first longitudinal vein. 



4 — second longitudinal vein. 



5 — anterior branch of the third longitudinal vein. 



6 — third longitudinal vein. 



7 — fourth longitudinal vein. 



8 — anterior intercalary vein. 



9 — fifth longitudinal vein. 

 10 — posterior intercalary vein. 

 1 1 — sixth longitudinal vein. 

 12 — anal vein. 

 13 — anterior cross vein. 



14 — portion of anterior intercalary referred to in Leptogaster. 

 15 — posterior cross vein, 

 a — costal cell, 

 b — sub-costal cell, 

 c — marginal cell, 

 d — first sub-marginal cell, 

 e — second sub-marginal cell. 



TRANS. AM. ENT. SOC, XXXV. (50) SEPTEMBER, 1909 



