30 



E. 15. Wii.r.iAMsox 



evening, near some favorable looking openings in the forest, till it was 

 quite dark without seeing a dragonfly. In this forest palms were dominant, 

 with some exogens, many of large size and a few giant ceibas, and more 

 rarely a small wild cacao, and many vines and scattered areas of heliconias 

 of varying extent. 



Material examined: Colombia, Cristalina, U.pt. Antio{iuia (February 

 i6, 1917, I female, E. B. W. ) ; Pent, Iquitos ( H. S. Parish, May 11, 

 1920, I male, E. B. W.), El Encanto. Rio Caraparana. I'utumavo Dist. 

 (W. T. M. Forbes, August 25, 1920, i male, Cornell) ; J'cncziicla, Tachira, 

 Dept. Tachira (April 6 and <S, 1920. 2 males, i female, E. 15. \\'.), La 

 Fria, Dept. Tachira (April 12-18, 1920, 19 males, 4 females, E. B. W.) ; 

 French Guiana, Tamanoir, Mana River (S. M. Klages, May and June, 1917, 



2 males, 3 females, Ace. 6008, Carn. Mus.) ; in the M. C. Z. are 3 males and 



3 females; one female bears the label "Essequibo (British Guiana), 

 Schneider"; two females each bear the label "Chapada (Brazil)"; two 

 males bear the label "America," one an additional label "Charp" ; a large 

 blue label, "tenuis, n. sp. Hagen," and a label "Gynacantha Rambur" ; the 

 remaining male has a single label "176."' 



Gvnacantha caudata Karsch 



Abdomen male 40-41 ; hind wing male 40-41 ; superior appendage male 

 4.2-4.3 ; stigma front wing 3. 



As compared wnth Karsch's description of a single male the following 

 may be noted. Face is greenish above. Thorax very similar to that of 

 tenuis, the brown outer part of the mesepisternum wider than the green 

 inner part, and also the dark stripe between the mesepimeron and mete- 

 pisternum wider than in teiuiis. Abdomen apparently brown, extreme apex 

 of 1-7 and 10 black; i with L well developed and D probably present; 2 with 

 AD, MD, PD, AML and PL present, AML developed basally well onto the 

 dorsum, PD and PL narrowly separated; margins of genital fossa without 

 spines or teeth, auricles with seven to nine denticles, the anterior ones very 

 small, increasing in size posteriorly; 3 with AL, MD, and ML clearly 

 present, all reduced, MD and ML joined, both narrow, probably apical 

 spots are present in life on this and succeeding segments, but these cannot 

 be detected on any of these segments in the single preserved specimen 

 before me; 4-6 with AL, MD. and ML present, MD and ML separated or 

 very narrowly joined, AL small and narrow, not produced posteriorly in 

 its lower part ; AL the only spots to be detected on 7. 



Material examined : Ecuador, San Rafael ( F. Campos R., i male, 

 A. N. S.). 



Gynacanthya tibiata Karsch 



6, 9, 10, 22, 25, 26, 27, 36. 



Abdomen male 41-50, female 51-53-5; hind wing male 41-50, female 

 50-53 ; superior appendage male 5-5.4, female 7-7.5 ; stigma front wing 3-4.5. 



