PHILIP P. CALVERT. 101 



Herr Forster erroneously refers (Ent. Nach. xxiv, p. 172, 1898) 

 to "(las Fehlen der Hypertrigonalqueradern iin Vorderfiiigel " of 

 Abbottu. Their presence is mentioned in my longer description 

 which he quotes in the footnote to p. 168. 



Is Orthetrum Phil/ipsi Kirby, Proc. Zool. Soc Loud. 1896, p. 

 522, from Somaliland, the same as Abbottilf 



7. Orthetrum fariuosuiii Forster. 



O.f. Forster, Ent. Nac.li. xxiv, p. 169, 1898.— Transvaal. 



I have not seen this species, but have placed it in the preceding 

 key from the excellent description alone. Herr Forster believes it 

 to be allied to AbbotUl, but two of the distinctions which he draws 

 between the two species are, I believe, of no value. These are the 

 number of rows of posttriangular cells in the hind wings, and the 

 position of the submedian cross-vein in the front wings. The three 

 rows of posttriangular cells of the hind wings of Abbottii are due to 

 the wide separation of the sectors of the triangle, so tliat two of the 

 three rows lie above, the third below, the upper sector. 



The absence of hypertrigonals in farinosum may be a more con- 

 stant difference, although variations of this kind occur in the types 

 of caff'ra and of chri/sostigma. 



8. Ortlietruiii trina«*ria Selys. 



Lib. t. Selys, Eev. Zool. 1841, p. 244 ; Eev. Orion, p. 1850; Ann. Soc. Ent. Belg. 

 xxxi, p. 19, 1887. McLachlan, Journ. Linn. Soc. Lond. Zool. xvi. p. 17h, 1882. — 

 Sicily. Egypt, Senegal. 0. t. Calvert, Proc. U. S. Nat. Mus. xviii, p. 145, 1895 

 (1896).— Tana Eiver, East Africa. McEachlan, Ent. Mo. Mag. (2) viii, p. 153, 

 1897.— Algeria. Karsch, Ent. Nach. xxi, 1895. Selys I. c. is authority for the 

 synonyms Lib. clathrtiffi and Bremii Ramb. Nevr. p. 48, 1842. 



9. Ortlietriiin azureuiii Rambur. 



Lib. a. Ramb. Nevr. p. 68, 1842. Selys, Rev. Odon. p. 292. 1850.— Madagascar. 



Rambur's type was a female, now in Baron de Selys' collection, 

 which also contains a male bearing this specific name on the pin. I 

 made the following notes on them in August, 1896 : 



Asuren Eanib., according to the % specimen so pin-labeled in Selys' collection 

 (although without any Serville laben, is very similar to Ran.ionneti in having no 

 color at base of the wings, grayish-white membraunle and no hypertrigonals on 

 any wings. The frons is not more prominent than in bmchialis [OdW.=contracfum 

 Ramb.], the hamule is the most prominent part of the genitalia and has the 

 external branch longer and very much thicker than the internal branch, the 

 genjtal lobe is oblong, longer than wide; abdomen not contracted at 3. Arculus 

 at the second antenodal, hind wings with the inner side of the triangle in prolon- 

 gation of the arculus and sectors of the triangle separated at their origins, inner 

 and outer ends of the pterostigma parallel. 



Rambur's female type in Selys' collection has hypertrigonals on the front wings, 

 base of the wings yellowish as far as the triangle; otherwise as in the male. 



TKANS. AM. ENT. SOC. XXV. SEPTEMBER. 1898. 



