1899.] NATURAL SCIENCES OF PHILADELPHIA. 237 



triangles free, its basal side a little nearer than the arculus, 3 post- 

 triangular cells, then 2 rows for 2 to 3 cells, then three rows 

 increasing to 13-14 marginal cells. 



Total length 43 mm., abdomen 29, sup. app. 2, third femur 6, 

 hind wing 35, pterostigma 3. 



This species is very similar to P. torrida Kirby ( Trans. Zool. 

 Soc. Loncl, xii, p. 340, pi. lii, f. 7, 1889), which, however, is 

 larger, having tlie total length of the body 58 mm., the wing 

 expanse 100 mm., the pterostigma 5 mm., no milky color at the 

 wing bases (at least none is mentioned in the description or shown 

 in the figure), and the membrauule white, while in spite of its 

 larger size torrida has fewer antenodals and postuodals than Don- 

 aldso))i. 



9. Orthetrum contractum Rambur. 



Libellula c. Ranib., Nevr., p. 60, 184:3. 0. >:. Calvert, Trans. Am. 

 Ent. Soc, XXV, p. 98, 1898, for full references. 



One male, Walenso, October 26, 1894. 



Pterostigma 3 mm. long. The brownish yellow alongside of 

 the membranule of the hind wings extends outward for a width of 

 two cells. Anterior lamina not as prominent as internal haraular 

 branch. Sectors of the triangle of the hind wings arising from the 

 same point. 



Variety ? 



One male, Walenso, October 2(3, 1894. Differs from the type- 

 form in having but one row of cells throughout the entire area 

 between the subnodal sector and the supplementary sector next 

 below. In three males from Kilimanjaro, by Dr. Abbott,' which 

 I still have before me, this area consists of one row of cells through- 

 out in six out of the twelve wings, while in the other six wings, 

 one or more of which belong to each of the three individuals, 

 there are one or two double cells inserted near the middle. This 

 variety is therefore hardly worthy of a distinctive name. 



10. Orthetrum brachiale Beauvois. 



Libellula 6., Beauv., Ins. Eecueil. Afr. Amer., p. 171, Neur , pi. 2, 

 fig. 3, 1805. 0. b. Calvert, Trans. Amer. Ent. Soc, xxv, p. 97, 1898 

 (with bibliography and synonymy). 



One male, Berbera, July 4, 1894; no pruinose coloring. 



* Described by me in Proc. U. S. Nat. Mus., xviii, p. 130, as 0. brachiale 

 Beauvoi*, although I have since shown this name to be incorrectly applied 

 here. 



