7() THE CANADIAN ENTOMOLOGIST. 



the Dipterologist, on account of their intricate and diverse neuration, which 

 in some species is ahiiost Neuropter-hke in tlie reticulation. 



Dou])tless tlic ninnl)er of our species will l)e augmented by future dis- 

 coveries, but yet we can never expect a very material increase. 



Our three described species, to which I here add a fourth, may be 

 diagnosed as follows. I have never seen Macquart's species, but it may 

 be distinguished without difficulty. 



A. Proboscis short, protruding but Httle from the opening of the 

 mouth. Antennae small, short, broadly separated ; wings not reticulate, 

 three submarginal cells, the outer posterior one closed before the border 

 of the wing, first posterior cell open, fourth (the one just behind the 

 discal cell) closed, anal cell narrowly open. 



a. Eyes pilose, second posterior cell open. — Hirmoncura hrcvirostris. 



aa. Eyes bare, second posterior cell closed before the border of the 



wing. H. ( Parasyinynictns) clausa O. S. 



B. Proboscis long, directed backwards. Face without protuberance ; 

 antennae small, short, very broadly separated, third joint nearly orbicular, 

 style of three joints. Eyes bare, contiguous in the male ; ovipositor of 

 female with two slender diverging lamelljE. ■\\' ings not reticulate, three 

 sul)marginal cells, the outer ones open, first posterior cell open, fourth 

 closed, the anal cell open. 



/;. Third joint of antenn?e nearly orbicular, or slightly pear-shaped, 

 third joint of style not much longer than first two together ; second 

 posterior cell closed and petiolate. Abdomen indistinctly fasciate. Length 

 9 m. Rhynchoccphalus Sackcni, Wlstn. 



bh. Third joint of antennae obtusely oval, third joint of style three 

 times as long as first two together. Wings more slender, second posterior 

 cell open. Abdomen distinctly fasciate. Length 12 m. R. volaticus, 



sp. nov. 



Hiniwiicura hrcvirostris, Macquart, Dipt. Exot. Suppl. i, 108, 8 ; Tab. 

 20, fig. I. Yucatan. This species differs from the type of Zr/r;//<?//^'//r^ 

 ( H. obscura (W.) Meig.) in the pilosity of the eyes, and closed second 

 submarginal cell. Baron Osten Sacken mentions (Cat. Dipt, note 142) 

 that he had seen a specimen of Hirvioneura from Colorado with the 

 second posterior cell open. It is possibly this, but I suppose a new species. 



H. clausttf O. Sacken, Western Dipt. 225, Texas. 



