0RTALID-A3 — R1VELLIA. 01 



quite as far as the fifth longitudinal vein ; the hyaline interval 

 between them is broader and the intervening portion of the 

 costal cell of a darker coloring than in R viridulans ; the costa 

 itself, from the extreme basis as far as about the middle of the 

 costal cell, is of a dirty-yellowish coloring. 



Hab. Nebraska (?). [I possess a specimen from Washington, 

 D. C, which agrees exactly with the above description. 0. S.] 



4. R. TariaMlis n. sp. % .—(Tab. VIII, f. 6.) Rufo-testacea, capite 

 pectoreque piceis, abdomine nigro-piceo, basim versus plerumque di- 

 lutius piceo, pedibus luteis, tibiis posticis tarsorumque apice fuscis. 



Brick-red ; head and chest pitch-brown ; abdomen pitch-black, towards 

 the basis usually of a lighter pitch-brown ; feet dark yellow ; hind 

 tibiae and the tip of all the tarsi brown. Long. corp. 0.18—0.21 ; long, 

 al. 0.15—0.2. 



Brick-red. Head pitch-brown or reddish-brown. Front of an 

 opaque dark-red coloring, on each side near the orbit with a 

 very narrow border of white pollen. Antennae reaching down 

 to the mouth ; the first two joints dark reddish-yellow ; the third, 

 with the exception of the basis, dark-brown, blackish towards the 

 tip. Palpi dark-brown. The chest and the lower part of the 

 pleurae dark pitch-brown. Abdomen pitch-black, generally lighter 

 pitch-brown near the basis. Coxae and feet dark-yellow ; the 

 four anterior tibiae but little infuscated ; the hind tibiae and the 

 last three or four tarsal joints dark-brown. Halteres dark-brown. 

 The picture of the wings almost entirely like that of R. quadri- 

 fasciata in coloring and design, only the first two crossbands 

 are a trifle longer and the first a little broader ; the brown col- 

 oring in the anterior basal cell is a little less extended. 



Hab. District Columbia (Osten-Sacken). 



Observation. — I have a female, from the same locality, which I 

 think belongs to the present species. It differs from the male, 

 described above, in having the antennae of an altogether dark- 

 yellow coloring, except the slightly infuscated tip of their third 

 joint ; the color in the middle of the thoracic dorsum almost 

 verges on blackish ; the first crossband on the wings is a little 

 longer, the front and middle tibiae do not show any distinct infus- 

 cation and the tip of the tarsi is but little infuscated. 



