96 burmeister's odonata. 



One or more pale yellow stripes on the sides of the thorax. 



Sides of thorax with one pale stripe, which is on the niesepimeron ; male 

 with the internal hamular branch not hooked at tip, inferior ap- 

 pendage reaching to the last denticle of the superiors. Front 

 wings with hypertrigonals 4. chrysostigiiisi Burm. 



Sides of thorax with two pale stripes, one on the niesepimeron, one on 

 the metepimeron; male with the internal hamular branch dis- 

 tinctly hooked at tip, inferior appendage not reaching to the last 

 denticle of the superiors. Front wings with hypertrigonals. 



5. eaflrriiiii Burm. 



Sides of thorax with a pale stripe on the metepisternuni and the entire 

 metepimeron pale green : male with the internal hamular branch 

 not booked at tip, inferior appendage not reaching as far as the 

 last denticle of the superiors, anterior lamina with a denticulated 

 tubercle ou its anterior surface. Front wings with hypertrigonals. 



6. AbboltJ Calvert. 



Sides of thorax pruinose in types, younger colors unknown ; males with 

 the internal hamular branch prolonged into a horn-like ai)ex bent 

 a little backwar,ls. No hypertrigonals. .7. farinosiini Forster. 



B. Hind wings of both sexes uncolored, membranule black. 



Costa exteriorly and the antenodals yellow; abdomen vesiculose at base, 

 contracted at 3, in both sexes 8. triiiacria Selys. 



C. Hind wings in the males at least uncolored, membranule grayish-white. 



Abdomen but little, or not at all, contracted at 3. 



Aiculus at the second antenodal, frons not more prominent than in the other 

 species, pterostigma rhomboidal, male with the hamulemore promi- 

 nent than the other genitalia, its external branch longer than the 

 internal ; wings uncolored ( 'J, i or yellowish at the base ( J ), neu- 

 ration black including the costa 9. azureiiin Rambur. 



Arculus between the first and second antenodals, frons more prominent than 

 in other species, pterostigma trapezoidal, male with the genital 

 lobe more prominent than the other genitalia, external hamular 

 branch shorter than the internal ; wings uncolored ( % ), neuration 

 blackish except the costa, which is yellow; 9 unknown. 



10. Raiisoiineti Brauer. 

 jJ II. Front wings with four rows of posttriangular cells. 



Abdomen not vesiculose at base, costa externally and some antenodals yellowish. 

 Pterostigma very long (6 mm.; 11. leoniiiuin Karscb. 



1. Orthetriim coiitractuni Rambur. 

 IJbellnln c. Ramb., Nevr. p. 60, 1842. — Mauritius. Madagascar. 

 Synonyms: Lib. coarctata Ramb. l. c. p. 61— Mauritius. 



Lib. sabina (not Drury) Burm. Hdb. ii, p. 857, 18.39— from Comoro 



Is. only ; see page 82, ante. 

 Orthefriim. brachiale (not Beauvois) Calvert, Trans. Am. Ent. Soc. 

 xix, p. 162, 1892; Proc. U. S. Nat. Mus. xviii, p. 130, 189.5 

 (1896).— Kilinia Njaro. 

 Forster, Ent. Nach. xxiv, p. 169, 1898.— Tran.svaal. 

 Orthet. capensif. Calvert, Proc. U. S. Nat. Mus. xvi, p. .584, 1893. — 

 Cape Town. 



