ISCHNURA. 125 
segment); the bifid dorsal process of the same segment of the males a little wider 
when the two species are compared side by side; eighth segment of the black female 
blue, in that of J. senegalensis black; I cannot separate the orange females when 
size fails *, 
Var. credula. 
Agrion credulum, Hagen, Syn. Neur. N. Am. p. 80 (1861) ™. 
Ischnura ramburii, var. credula, Calvert, Proc. Calif. Acad. Sci. (2) iv. p. 489, t. 15. figg. 5, 6 
(apps. ¢) (1895) 7°; (3) Zool. i. p. 384 (1899) *. 
Agrion defixum, Hagen, Syn. Neur. N. Am. p. 80 (1861) ”. 
Ischnura ramburii, Carpenter, Journ. Inst. Jamaica, ii. p. 261 (1896) *. 
The following measurements are for the same purpose as under J. ramburt, supra :— 
Vera Cruz. Mexico city. Champerico. Hayti. Martinique. 
mm. mm. mm, mm. mm. 
Abdomen 6 ........ 22°5 24-26 wea 22°5-25 21-24 
black Q ........ 24:5 25:5-27 21-23 23-26 24°5 
orange? ........ 22 sees sees 23°5-26 23 
Hind wing ¢ .....-.. 14 17-18. 13 14-16 13°5-15 
black @ ........ 16 19-20 13°5-14 15°5-17 16°5 
orange 2 .......- 16 wae ae 16-18 15 
I have not been able to find any differences in orange or olive females which would enable one to distinguish 
them as I. ramburi type or as var. credula. They are placed in these tables of measurement and in the lists 
of localities for convenience and for the sake of comparison. I have not seen a single orange female with 
the epistoma orange, such as de Selys* mentions from New Orleans; perhaps it was really a different 
species. 
Hab. Unirep States, Enterprise (P. Laurent, coll. Am. Ent. Soc.: 1 3) and Key 
West (Morrison, M. C. Z.), Florida, Northern California!”; Lower CaLiFOoRNIA, 
Comondu 1%, San José del Cabo 15.—Mexico, Presidio de Mazatlan (Forrer: 2 3, 
1 or. 2, lol. 2), Tampico (M@. C. Z.: 1 bl. 2), Acaponeta, Tepic’®, Guadalajara 
(Schumann: 1 bl. 2 ), Patzcuaro (Rhoads: 1 3,16 or. 2), Mexico city [5 ¢, 5 bl. 9 |, 
Pefion, Distrito Federal {1 bl. 2,3 or. 2 | (Barrett, colls. Adams, P. P. C.), Amecameca, 
Morelos [1 ¢ ], Tabi, Yucatan [1 ¢ ] (Godman), Vera Cruz (H. H. Smith: 7 3,1bd1. 2, 
1 or. 2; Barrett, coll. P. P. C.: 13), Acapulco (HA. H. Smith: 2 3, 1 or. 2), 
Coatzacoalcos and Salina Cruz (Deam, Williamson det.); GuaTeMALA, Champerico 
(Champion: 2 3,4 bl. 2, one of the latter marked “ sea-coast ”) —Banamas, Crooked 
Is.15; West Inpizs, Cuba, Hayti (P. &. Uhler, W. Cabot, M.C. Z.: 33,2 dl. 9, 
* The following abnormalities exist in the material before me of J. ramburi, which, since they are rather 
unusual among the Agrionine, seem worthy of note. One male from Mexico city has the first posteubital on 
the front wing not extending beyond the median vein. Another male, from the same locality, has the pigment 
entirely lacking from the pterostigma of the right front wing, the pterostigma and the veins beneath it being 
somewhat distorted ; on the left side colour and venation are normal. It may also be added that a male from 
Virginia in my collection has the third antenodal cell on the right hind wing completely divided into an 
anterior and a posterior half, although no other cell in the neighbourhood is so divided. 
