LIBELLULA. 209 
as it had no yellow at the base of the wings and a supra-triangular cross-vein on the 
hind pair, both of which features exist in the majority of herculea, while not one hind 
wing of the present material of foliata possesses such a cross-vein. At all events, I 
am confident that the males and females before me are conspecific. 
I cannot accept the suggestion of Prof. Karsch (Ent. Nachr. xv. p. 342, 1889) that 
foliata is identical with herculea; in addition to the differences stated on page 207, the 
male of foliata lacks the pointed tubercles on the frons, and the genital hamule is not 
so deeply divided. 
8. Libellula herculea. 
Libellula herculea, Karsch, Ent. Nachr. xv. p. 235 (1889)*; Brauer, Berl. ent. Zeitschr. xxxiii. 
p. 361 (1890) *. 
Belonia longipennis, Kirby, Trans. Zool. Soc. Lond. xii. p. 834 (1889) *. 
? Belonia foliata, Kirby, |. c. p. 333 (1889) * ( 5 only—see above). 
The pointed tubercles on the frons of the male are sharpest and longest in the individuals from Mexico and 
Guatemala, distinctly less so in those from Colombia, and still less in those from Brazil and Paraguay. 
In the female sex only obtuse rudiments of these tubercles are present. 
The vertex is more deeply bifid in both sexes from Mexico than from Paraguay, but the difference is not so 
marked nor can it be traced so clearly geographically as in the case of the frontal tubercles. 
Genital hamule of the male quite deeply divided for a Libellula, outer branch well developed although still 
shorter than the inner branch; genital lobe a little wider than long, subcircular. 
The following differences in the number of cross-veins on the wings and in size are presented by the material 
before me :— 
9 g, Atoyac. 8 3,8. Lucia. 1 J, Para. 4 g, Sapucay. 
Antenodals, front wing .... 18-22 17-20 22-23 14-16 
3 hind ,, .... 13-17 12-16 16-17 11-14 
Postnodals, front ,, .... 12-17 12-16 14-16 10-13 
” hind ,, .... 13-17 13-16 14-16 11-13 
Abdomen (in mm.) ...... 39-34 315-335 36 30-31 
Hind wing( 4 ) ..... 40°5-42°5 39-42 | 44 37-38 
The largest males are those from Colombia and Para, the largest female from S. Julian; the smallest of 
both sexes are from Sapucay. 
The sides of the thorax and of the abdomen at base are pruinose in old males. 
My measurements of 1896 from the British Museum collection give the pterostigma of B. longipennis as 
6-5-7 mm., not 8 mm.” * 
Hab. Mexico, Atoyac in Vera Cruz (Schumann, H. H. Smith: 9 3,2 2), Temax 
in North Yucatan (Gawmer: 1 2); Guaremata, Cahabon [1 ¢ ] and Purula [2 ¢ ] in 
Vera Paz (Champion), Santa Lucia in Dept. Escuintla (Williamson, coll. ejusd.: 6 3, 
Hine, coll. O. S. U.*: 2 3); Costa Rica (Hoffman '), Carrillo (Underwood: 3 ¢ ), 
Caché (Rogers: 1 2), Bkistebu, Diquis Valley (Biolley, coll. Adams: 1 3): Panama, 
Chiriqui (coll. McLachlan: 1 3 ).—Cotompia (Starke), Don Amo [1 ¢ ] and Minca 
[1 ¢] in Dept. Magdalena (. H. Smith, Carn. Mus. Pittsd.), Santa Fé de Bogota 
* Ohio State University, Columbus, Ohio. 
