THE CANADIAN ENTOMOLOGIST 



17 



A NEW SPECIES OF ARGIA (ODONATA). 



BY CLARENCE H. KENNEDY, RALEIGH, N. C. 



Argia rita, n. sp. 



Holoiype. — Female, collected in the Santa Rita Mts., Arizona, July, by 

 I-'. H. Snow, and now in the Snow collection at Kansas University, Lawrence, 

 Kansas. The label does not gi\e ihe year, but gives the elevation as 5 to 8,000 

 feet. The male is unknown. 



It is difficult to even surmise the nearest relatives of this species. The 

 shape of the lateral lobe of the mesostigmal lamina suggests that of agrioides, 

 but in agrioides there is no pit beneath it. 



Length of abdomen 30 mm., length of hind wing 26 mm. 



Female. — Colour: labium pale, labrum bluish (?), face and head otherwise 

 \iolaceous except the \entral surfaces which are pale straw. Each postocular 

 area bounded anteriorly and posteriorly by a narrow bar of black. 



E3E3I^3 



Fig. 3. — Ar^ia rita: colour-pattern of type. 



Prothorax violaceous, darker above, the side with a sinuous line, the dorsum 

 with a heavy Y mark, the fork opening caudad. 



Mesothorax and metathorax violet becoming paler on the sides. Mid- 

 dorsal keel pale but edged by a very narrow, mid-dorsal, black stripe which 

 widens above but fades out below. Pits of mesostigmal laminae black. Antealar 

 ridges black. A small, black spot on the upper part of the mesinfraepisternum. 

 Humeral stripe narrow in the lower half, narrowing to a hair line above but 

 widening into an oval spot at the alar ridge. Second lateral suture with a 

 hair line of black. Pterostigmata brown. Legs with a narrow anterior stripe 

 on the femur and a pale brown stripe on the ventral side of the tibia, otherwise 

 bluish gray. 



Abdomen \iolaceous on segments 1 and 2, brown on segments 3 to 7, and 

 blue on segments 8 to 10. The following black markings occur (see fig. 3): 



a pair of stripes on segment 2, mere 

 hair lines with the posterior end of each 



Fig. i.—Aogia rita: dorsal view of 

 mesostigmal laminae. 



Fig. 5.^ — Argia rita: lateral view of 

 [mesostigmal lamina?. 



enlarged into a triangular sjiot; an apical ring, incomplete below on segments 

 2 to 6; a saddle-shaped spot on the apex of segments 3 to 0. This is connected 



January, 1910 



