Notes on the Genus Erythemis 9 



2(1). Abdomen less than 30 mm. long, shorter than the hind wings. Dorsum of 

 thorax distinctly patterned, paler above, bordered on either side with ante- 

 humeral black or the thorax black. Yellowish or greenish to black insects. 

 Male with the external branch of the hamule triangular in shape, the postero- 

 ventral edge longer than the distance between the apex of the internal branch 

 and the antero-ventral angle of the external branch. Female lamina short (not 

 seen by me ) credula. 



2'. Abdomen 30 mm. long or longer. Male with the external branch of the hamule 

 rounded, the postero-ventral edge equal to or shorter than the distance between 

 the apex of the internal branch and the antero-ventral angle of the external 

 branch 3. 



3 (2'). Tibiae, and to a lesser extent the femora, largely dark brown or black. Abdo- 

 men and hind wings about equal in length. Male with the external branch of 

 the hamule rounded, the postero-ventral edge equal to or slightly shorter than 

 the distance between the apex of the internal branch and the antero-ventral 

 angle of the external branch. Female lamina trough-shaped, projecting ven- 

 trad, the apex not distinctly bent and not directed caudad 4. 



3'. Legs largely pale. Hind wings longer than the abdomen. Thorax not dis- 

 tinctly patterned paler and darker. Yellowish or greenish to red insects. Male 

 with the external branch of the hamule rounded, the postero-ventral edge about 

 equal to, or slightly more than, half the distance between the apex of the 

 internal branch and the antero-ventral angle of the external branch. Female 

 lamina distinctly bent so the apical lobe is directed caudad, and, in lateral view, 

 there is a deep posterior emargination between the basal lobes and the apex; 

 from apex to base of basal lobe of lamina about .9 mm.; apex of sternum of 

 segment 9 with a patch of sparse bristles carmelita n. sp. 



4(3). Dorsum of abdominal segments 5-10 predominantly dark or black; dorsum of 

 thorax distinctly patterned, paler above, bordered on either side with a black 

 antehumeral band, or the thorax black. Yellowish or greenish to black insects. 

 Male with external branch of the hamule directed ventrad, in posterior view 

 erect. Female lamina from base of basal lobe to apex 1.5 mm.; apex of 

 sternum of segment 9 with a patch of sparse bristles (80%) or with a single 

 transverse row (20% ) plebeja. 



4'. Dorsum of abdominal segments 5-10 predominantly pale; dorsum of thorax not 

 distinctly patterned paler and darker. Green or yellowish-green to red insects. 

 Male with the external branch of the hamule directed more caudad than ven- 

 trad, not erect in posterior view. Female lamina from base of basal lobe to 

 apex .75 mm.; apex of sternum of segment 9 with a single row of bristles 

 (80%) or with a patch of sparse bristles (20%) haematogastra. 



5 (i'). Labrum, face and frons pale colored, green and yellow. Wing bases unmarked 

 or, at the most, hind wings basally tinged with yellow. Thorax not definitely 

 patterned; green or yellowish green to dark pruinose. Male with ventral teeth 

 on the superior appendages extending posteriorly beyond the level of the apex 

 of the inferior appendages ; external branch of the hamules directed more 

 caudad than ventrad, genital lobes reaching ventrad far beyond the level of 

 the hamules. Female lamina from base to apex about 1.25 mm., in antero- 

 ventral view rounded triangular in shape, in lateral view the posterior basal 

 lobe scarcely evident; apex of sternum of segment 9 with a single, or at most 

 a double row, of bristles (true also of peruviana) 6. 



5'. Labrum, face and frons not as above. Base of hind wings distinctly dark or 



at least (some females) tinged with yellow. Thorax yellowish or greenish 

 yellow to red or black. Male with ventral teeth on the superior appendages 

 extending posteriorly to about the same level as the apex of the inferior appen- 



