ENALLAGMA. 113 
described by Selys?. All have an inferior longitudinal black stripe on each side of segments 8 and 9, 
and the dorsum of 9 entirely blue. The dorsum of 8 is entirely blue in the Jamaican and Pernambuco 
males ; each inferior stripe sends upward an anteapical prolongation, which, however, does not meet its 
fellow of the opposite side in one male from San José del Cabo; the union of these anteapical pro- 
longations making the apical dorsal third black is the condition of most of the continental examples, 
while the male from Presidio has a narrow mid-dorsal black stripe reaching forward from the apical black 
to base. 
Hab. Lower Cauirornta, San José del Cabo (Hisen & Vaslit®, coll. P. P. C.: 
2 ¢).—Mexico, Presidio de Mazatlan (Forrer: 1 3), Tepic (Hisen & Vaslit, coll. Calif. 
Acad. Sci.: 1 2), Medellin [2 3, 1 2], Atoyac [1 3] (H. H. Smith), Orizaba (Ff. D. 
Godman & H. H. Smith: 1 3), Rio Balsas (Barrett, coll. P. P.C.: 1 3), Acapulco 
{1 ¢, 1 2], Teapa [1 ¢, 1 9] (A. H. Smith), Tehuantepec and Tolosa (Deam, 
Williamson det.), Putla?; Costa Rica, Caché (Rogers: 2 36, 1 9 ).—VENEZUELA, 
‘Caracas (R. M. Bartleman, U.S. N. I: 5 3,1 2); Braz, Pernambuco ( Veilenmann, 
M. C. Z.: 1 6); West Inviss, Portland [2 3,1 2], Kingston [2 3, 2 2] and Bog 
Walk [1 ¢ ] in Jamaica (colls. A. WV. S., P. P.C.), Port-au-Prince, Hayti (Hhrenberg*), 
Puerto Rico (Moritz *), St. Thomas ! ?. 
The Mexican specimens were captured between September and April. 
The continental representatives differ from those from Jamaica and from de Selys’s 
description 2 as follows:—Males with merely a small black spot on the upper end 
only of the second lateral thoracic suture (instead of a stripe for the greater part of its 
length) ; the small internal tooth of the superior appendages at nearly mid-length instead 
of at three-fourths from the base, the lower branch of these appendages longer (three- 
to four-fifths as long as the upper branch, instead of one-fourth to one-half as long) 
and more slender (even to half as wide as long, while in the Jamaicans the width is 
as great as the length). Females with the epistoma (nasus) violet or blue, with a 
black line at the articulation with the frons, instead of black throughout. 
The lower branch of the superior male appendages reaches its greatest relative 
length in the individuals from Caché; the Pernambuco male has the most slender 
appendages. 
(7. Enallagma eiseni. 
Enallagma eiseni, Calvert, Proc. Calif. Acad. Sci. (2) iv. p. 486, t. 15. fig. 7 (apps. ¢) 
(1895) *. 
Hab. Lower Cauirornta, Baja Purisima! (C. D. Haines, coll, P. P. C.: 3 ¢), Mesa 
Verde}, Sierra San Lazaro 1, San José del Cabo!. 
This is now the only species of Odonata known to be restricted to Lower California *, 
but to find it on the Mexican mainland would not be surprising. | 
* Two other species, Macrothemis inequiunguis and Trithemis basifusca, which in 1895 (J.¢. p. 466) I stated 
to be also peculiar to this peninsula, were subsequently found at Tepic. 
BIOL. CENTR.-AMER., Neuropt., December 1902. q 
