Triacantiiagyna and CiVnacantha 37 



extreme apex black ; nine to twelve scale-like teeth in a single row on the 

 posterior half of the converging margins of the genital fossa ; eleven to 

 fourteen denticles on the auricles, the most anterior ones the smallest, in- 

 creasing in size posteriorly, the posterior live or six about equal in size; 3 

 with AL blue, MD and PD small, apparently green in life, no other spots 

 evident in the preserved specimen ; AL and MD small, but present on 4-8, 

 ML not quite so plain but fairly distinct traces of it in all of the same 

 segments; 9-10 and appendages dark to black; 3-7 light brown beneath, each 

 segment darker at apex; 8 pale beneath, apparently light green in life. 



Wings hyaline, costa dark brown, stigma brown surrounded with darker 

 veins, venation black or nearly so; one row of cells throughout between Mj 

 and Rs ; in the four front wings examined the loop in M^ is single rowed 

 between M3 and M4 in two wings and with a single double cell in the other 

 two wings ; in the four hind wings likewise the loop is single rowed in two 

 wings and with a single double cell in the other two wings. 



Legs light reddish brown ; hrst femora darker, especially at apex, and 

 with a broad green or gray stripe behind ; second and third tibiae yellow 

 dorsally. 



Female. — The single specimen is not fully matured and the color is not 

 well preserved. The head is similar to the male. The prothorax and thorax 

 are faded to a uniform unmarked light reddish brown. Abdominal seg- 

 ment I brown, darker above posterorly, apically ringed with black ; 2 with 

 only MD, PD and PL evident, the first apparently green, the last two 

 clearly blue, but the abdomen is too faded to determine the color pattern 

 certainly ; it probably does not dififer materially from the male. However 

 AL can be discerned on 3-8, and MD and ML on 3-7; as in the male PD, if 

 present in life, has disappeared due to postmortem changes. The lateral 

 carina on 2 is black and at the level of the transverse carina is elevated in 

 the nearest approach to an auricle attained by the female of any American 

 Gynacantha. The ventral carina on the same segment is also characteristi- 

 cally curved at its posterior end in a manner suggesting the form in the male. 

 At the anterior end of the ventral carina and just above it is a brown spot. 



The abdominal appendages are linear to about tive-nintlis the length, 

 where they widen slightly in a symmetrical expansion which tapers sym- 

 metrically to a rather abruptly acute apex ; the expanded portion with a 

 maximum width of about .5 and with a low median dorsal longitudinal keel. 



Wings similar to the male, stigma paler, due doubtless to less mature 

 condition ; one row of cells throughout between M., and Rs ; in both front 

 wings and one hind wing the loop in M^ is single rowed between M^ and 

 M4, and in the other hind wing there is one double cell and one forked cell. 

 Legs as in the male. 



Material examined, French Guiana, Tamanoir, Mana River (S. M. 

 Klages, May and June, 191 7, 2 males, i female, Ace. 6008, Carn. Mus., 

 type male, June and allotype female. May). This fine species is named for 

 S. M. Klages, whose collections have added much to our knowledge of 

 neotropical insects. 



