1895. PROCEEDINGS OF THE NATIONAL MUSEUM. 145 



wider, apex obliquely truncated. Genital lobe projecting farthest, 

 wider just before the apex than at the base ; apex regularly and symmet- 

 rically rounded. 



ORTHETRUM BRACHIALE, Beauvois. 



Libellula irachiale, Beauv^ois, Ins. Afr. Amer., p. 171, Nevr., pi. 2, fig. 3, 1805. — 

 Selys, Ann. Soc. Ent. Belg., XXXI, p. 21, 1887.— Rambur, Nevr., p. 62, 

 1842.— Gerstackek, Mitt. Naturh. Mus. Hamb., IX, 1, p. 5, 1891. 



Orthetrtim brachiale, Calvert, Trans. Am. Ent. Soc, XIX, p. 162, 1892. 



One female, abdomen 31, hind wing 33. The vulvar lamina differs 

 from my description quoted above, in that its apical margin is not "bent 

 toward the abdomen in the middle," but I do not believe that this indi- 

 cates anything more than a difference in the manner of drying. 



ORTHETRUM TRINACRIA, Selys. 



Lihelhda trinacHa, Selys, Rev. Zool., 1841, p. 244; Rev. d'Odou. Eur., p. 4,1850; 

 Ann. Soc. Ent. Belg., XXXI, p. 19, 1887.— McLachlan, Jour. Linn. Soc. 

 Lond., Zool., XVI, p. 178, 1882. 



One female, abdomen 39, hind wing 37, pterostigma 4.5. From De 

 Selys' description ' it differs only in the following minor points: The 

 yellow of the rear of the eyes is not spotted with black; the only dis- 

 tinguishable markings on the luteous thorax are a very slender brown 

 antehumeral stripe and an obscure dark line on the upper part of the 

 humeral suture. It agrees with the distinctive specific characters, viz, 

 the abdomen distinctly compressed and vesiculose at base, and the 

 absence of yellow at the base of the hind wings, and it possesses 10-11 

 antecubitals on the front wings. 



' Rev. d'Odon. Eur., p. 4, 1850. 

 Proc. X. M. 95 10 



