380 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



6. Argia extranea Hagen. 

 Plate XXV, Fig. S. 



Agrion extraneum Hagen, Syn. Neur. N. Am., 1861, p. 92; Kirby, Cat. 

 Odon., 1890, p. 138. 



Male bluish violet with the following black markings: hind surface of sec- 

 ond antennal joint and all of the following joints, a transverse vertex band 

 from eye to eye, and a narrower curved stripe on the rear of the head, below 

 which stripe the color is blue rather than violet; a mid-dorsal prothoracic and 

 thoracic band; a humeral stripe as wide at its lower end as the mid-dorsal, 

 abruptly narrowed at a right angle in its second fourth to half this width, 

 contracted to a mere line at its middle and becoming only slightly wider at 

 its upper extremity — the violet between the mid-dorsal and the humeral 

 stripes is wider than the former; a narrow stripe on the second lateral suture; 

 some lines in the grooves on the pectus; abdominal segment 1 at base; on 2 

 a longitudinal band each side, wider in its apical half, bilobed at apex, inner 

 (mesal) lobe curved towards its fellow of the opposite side, and a narrow, 

 transverse, apical ring; 3-6 with a longitudinal band each side, reduced to a 

 line in the middle, much wider at the apices of the segments where, on 4-6, 

 it unites with its fellow of the opposite side; 7 almost completely black, leav- 

 ing only a narrow, transverse, basal ring and a mid-dorsal prolongation 

 therefrom to about one-third of the length of the segment violet; 8-10 with 

 an inferior longitudinal stripe each side for their entire length; sterna of 3-10; 

 femora except at base, tibiae inferiorly, tarsi entirely. 



Tenth abdominal segment with a mid-dorsal apical cleft, tuberculated on 

 either side. 



Appendages blackish. Superiors half as long as 10; viewed from above, 

 apex wider than base and truncated in a straight line nearly at right angles 

 to the long axis of the body; horizontal width of the apex greater than its 

 vertical height; in profile they show an inner, apical tubercle. Inferiors 

 nearly two and a half times as long as the superiors, a little longer than 10, 

 extending backwards in the prolongation of the body, with the apex grad- 

 ually tapering but not acute; viewed in profile each shows on its upper surface 

 a median, conical, pointed tubercle just distal to the apex of the superiors, 

 while the lower edge is concave. 



Wings clear. Pterostigma dark brown, surmounting more than one but 

 less than two cells, outer end convex, inner straight. Front wings with four 

 antenodal cells, fourteen to sixteen postcubitals, nodal sector arising at or 

 near the seventh, ultra-nodal at two or three cells more remote. Hind wings 

 with three antenodal cells, 12 postcubitals, nodal sector arising at or near the 

 sixth, the ultra-nodal at three cells more remote. 



Dimensions: Total length 35-36 mm.; abdomen 28-29 mm.; hind wing 

 21.5 mm. 



2 $ Tepic, Oct., 1894, Eisen and Vaslit. 



