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



side is but one-half (or less) as long as the lower side. Dr. 

 Eisen writes of this species, "It lives entirely in the shadow 

 and is very rare." 



Six specimens (teste Dr. Eisen, I have seen but two males), 

 Baranca Blanca, 2400 ft., near Tepic, Nov., 1894, Eisen 

 and Vaslit. 



The Museum of Comparative Zoology at Cambridge, 

 Massachusetts, contains individuals of this species from the 

 following unrecorded localities: Polyon, Department Occi- 

 dentale, Nicaraugua (McNeill Coll.); Isthmus of Tehuan- 

 tepec (F. Sumichrast), Acapulco, Mexico (A. Agassiz). 



5. Argia Harknessi, sp. nov. 

 Plate XXV, Fig. 6. 



Male bluish violet with the following black markings: the posterior surface 

 of the second antennal joint and all of the following joints; a transverse verti- 

 cal band from eye to eye, confluent at the occiput with black covering most 

 of the rear of the head — a pair of cuneiform, violet, postocular spots conse- 

 quently exist; a mid-dorsal prothoracic and thoracic band, enclosing a small 

 circular violet spot on the hind lobe of the prothorax; a humeral stripe as 

 wide at its lower end as the mid-dorsal, narrowed at right angles in its lower 

 fourth to half the width of the mid-dorsal, reduced to a line in its upper half— 

 the violet which remains between the mid-dorsal band and the humeral stripe 

 is throughout wider than the former; a line at the upper end of the obsolete 

 first lateral thoracic suture, a complete line on the second lateral suture; a 

 mid-dorsal and a lateral spot on abdominal segment 1 ; on 2 a superior longi- 

 tudinal cuneiform stripe (the apical end the wider) and an inferior longitudi- 

 nal stripe each side, and a transverse apical ring; 3-5 with a lateral apical 

 stripe, pointed anteriorly, and reaching half-way to the base, uniting on the 

 mid-dorsal line with its fellow of the opposite side in the apical third of the 

 segment; similar stripes on 6 but occupying more than the apical half of the 

 segment; 7 almost entirely black except for a narrow, transverse, basal, 

 violet ring; inferior lateral longitudinal stripes on the apical part of 8 and for 

 the whole length of 9 and 10; a narrow, transverse, basal ring and a similar 

 apical ring on 10 uniting with the lateral stripes; sterna of 3-10; femora supe- 

 riorly, tibiae inferiorly, tarsi entirely. 



Tenth abdominal segment on its apical margin with a mid-dorsal, semicir- 

 cular excision having a pale tubercle on either side and a pale median tuber- 

 cle below. 1 



1 Such a median tubercle is mentioned by Hagen (Syn. Neur. N. Am., p. 90, 1861) for 

 A. bipunctulata, and is to be found in many Agrionine males. It is probably homologous 

 with app. d., fig. 3, PI. XXV, accompanying this paper, and with the "inferior append- 

 age" of adult Anisopterous males. 



