282 THE CANADIAN ENTOMOLOGIST. 



NOMADIN^. 



Gnat/lias, Robt. 



? 



Length over lo mm.; abdomen dark red; third submarginal cell nar- 

 rowed almost to a point above ; first abdominal segment with a 

 black mark on each side i . 



Length under lo mm.; third submarginal cell not so much narrowed, 

 except in Grayi eastonensis 2. 



1. Second segment of abdomen with distinct yellow spots 



(9th May) perbella, Vier, n. sp. 



Second segment of abdomen with no yellow spots 



(28th May) . perbella, var. 



2. Two submarginal cells Grayi eastonensis, var. 



Three submarginal cells • • .3- 



3. Orbits hardly converging below ; third submarginal cell very high and 



narrrow, but not much narrowed to marginal 



(Wash) Washingtoni. 



Orbits conspicuously converging below 4. 



4. Abdomen dark red (April) rhodomelas ? 



Abdomen light red (May) 5. 



5. Third submarginal cell narrowed nearly to a point above, broad 



below (Wash) Grayi eastonensis. 



Third submarginal cell not thus narrowed above Grayi 



Scutellum black or red ; tegulae ferruginous ; clypeus with only the 

 anterior margin yellow, though often broadly ; second submarginal cell 

 receiving the recurrent nervure beyond its middle ; abdomen light red, 

 with four large yellow spots ; scape black in front ; second submarginal 

 cell narrow rhodomelas. 



Species very like rhodomelas, scape almost entirely ferruginous, second 

 submarginal cell broad, as broad at base as high ; abdomen dark red ; 

 thorax, excepting scutellum, which is red, black : second and third 

 abdominal segments with a conspicuous yellow spot on 



each side perbella. 



Gnathias perbella, n. sp. 



This is the species mistaken by Prof Cockerell for a variety of bella. 



It can readily be distinguished by the characters given in the table. This 



species may prove to be a race of maculata. I wish to retract my state- 



