522 Annals of the Carnegie Museum. 



wings this sector reaches quite perceptibly beyond this cross-vein; 

 nodal sector in front wings exactly at the fifth postcubital, in hind 

 wings at the fourth postcubital. Thoracic dorsum beautifully black- 

 violaceous, shining ("Thorax azure, le devant noir- violet," Selys) ; 

 second lateral suture with a rather broad, black stripe from the base 

 of hind wings, extending between the second and third coxae; labrum 

 shining, blue-black, with the anterior margin pale yellow; anteclypeus 

 shining, blue-black as the labrum; postclypeus slightly shining, bluish 

 gray, at the middle apparently divided longitudinally by a narrow 

 black stripe; front and vertex chiefly black- violaceous, shining, but 

 not as much as the labrum and anteclypeus; antennae black; man- 

 dibles brown-red; labial portions rather pale yellow, but the structures 

 not readily seen; legs pale yellow; femora slightly pale bluish, the 

 same color encircles the first and second femora at apex; a pale annulus 

 at their middle; the tibia annulated by brownish, and with the apical 

 one third of the posterior tibiae brown; tarsi brown; claws dark brown- 

 red, tipped with black and with a minute tooth before the apex. 

 Abdominal segments i and 2 above black-violaceous, which color 

 expands at apex to the lateral margin of each segment, the rest of 

 the two segments yellowish; copulatory organs reddish brown; seg- 

 ments 3, 4, 5, and 6 blackish brown, each with the base and apex 

 darker, slightly violaceous; at the extreme base of 3 a pale spot, and 

 4, 5, and 6 each with a narrow, yellowish ring at base; 7 slightly 

 violaceous with a little less than the basal half and the lateral margin 

 yellowish; 8 violaceous with the lateral margin rather broadly yellow; 

 9 and 10 black-green with the base of 9 slightly violaceous; dorsum of 

 ID with an apical, angular incision; anal appendages hardly shorter 

 than 10; superior and inferior appendages of about equal extension, 

 the former dark brown with black tips; the inferior appendages yellow 

 with black tips, narrowed beyond the middle and then widened 

 gradually to apex, which is obliquely truncate; seen from below the 

 inferior appendages are curved so as to form the shape of a lyre with 

 their tips diverging. 



Suborder ANISOPTERA Selys. 



Genus Gynacantha Rambur. 



8. Gynacantha nervosa Rambur. 



Gynacantha nervosa Rambur, Ins. Neur., 1842, p. 213. 



One female taken at Nueva Gcrona by Link on September 11, 1912. 



