ISCHNURA. 
127 
lower ends only represented by a superior and an inferior cuneiform blue spot respectively (2 2), or 
represented by an inferior blue spot only (1 ¢@). 
Dorsum of abdominal segments 8 and 9 and at least part of 10 blue, 8 and 9 with lateral black stripes 
united across the base of 8. No vulvar spine. 
© (orange or heterochromatic). 
individuals occur, and there is no correlation with the colouring of abdominal segments 8 and 9. 
Black stripes on the legs wider than in the orange ?. 
Nasus either shining black or orange, with a black line at base ; transitional 
These last 
may be black dorsally, or as described above for the black ¢ ; perhaps the former is indicative of greater 
age, but I have no proof that it is so. 
Of 107 orange females specially examined, 8 (2 San Felipe, 1 San 
Bernardino, 1 Los Angeles, 2 Arizona, 1 Tepic, 1 Patzcuaro) have a small but distinct vulvar spine, the 
remaining 99, or 92°5 °/,, lack it. 
The postcubitals in both sexes are fewer in the examples from California and Arizona than in those from farther 
south. Thus 24 ¢ and 6 9, from the two States mentioned, give for the front wings: 10 postcubitals 
1:3 °/,, 9 29°3°/,, 8 58:5°/,, 7 10°4°/,; and for the hind wings: 8 posteubitals 5:2°/,, 7 60-2 °/o, 
11 g 12 2 from Morelia, Patzcuaro, Mexico city, Jalapa, and Orizaba give for the front 
wings: 12 postcubitals 4-4°/,, 11 13:0°/,, 10 41°3°/,, 9 41°3°/,; hind wings: 9 postcubitals 26 °/,, 
While no constant difference exists between the two sexes in the number of post- 
cubitals, the females tend to the higher numbers: thus the 12 and 11 postcubitals just mentioned were 
found only in females *, A similar, but less marked, sexual difference exists in J. ramburt and var. credula. 
6 84:5 %/,. 
8 56:4 9/5, 7 
17°6 9/,. 
Dimensions (cf. the numbers of individuals enumerated below) :— 
San Felipe. | San Bernardino..| Los Angeles.| Arizona. Patzcuaro. | Mexico city. 
mm mm. mm. mm. mm. mm. 
Abdomen o........ 18-19 19-20 17-20 18:5-19°5 | 18:5-20 19-21 
black 2 ......8. . bows a a 18-19 | 185-20 
orange 9 ........ 19-20 21 20°5 19-20 16-20°5 18-21°5 
Hind wing d ........ 12-13 13°5-14 11-13 12°5-13 13-14 13-15 
black 9 ........ a bees a bee 13°5 15 
orange 2 .....66- 14 15°5 13°5 14 13-15 13-17 
Hab. Untrep States, San Felipe valley 2300 feet (coll. Adams: 8 3,2 27), San 
Bernardino [P. C. Truman: 2 3,1 9 |, Los Angeles [A. Davidson: 2 ¢ | (coll. P. P.C., 
types of I. exstriata) (coll. Adams: 4 6, 1 2), in California, Arizona (MZ. CL Z, 
C. U. lot 85: 8 3,2 9, see footnote, p. 104); Lower Cattrornia, San Fernando >.— 
Mexico!, Durango (Barrett, coll. P. P.C.: 1 3), Tepic (Hisen & Vaslit, coll. Calif. 
Acad. Sci.: 1 3, 1 2), Queretaro (Deam: 1 3), Acambaro (Rhoads: 9 3, 1 2), 
Morelia? [3 ¢, 6 2 |, Patzcuaro [1 2] (Godman) (Rhoads: 28 3, 2 bl. 2, 25 9; 
Deam), Uruapam (Rhoads: 2 2), Mexico city (Schumann, H. H. Smith, Godman, 
Barrett, colls. Adams, P. P.C.: 25 3,2b1. 2,52 2), Tacuba [1 ¢,1 2 |, Chapultepec 
[1 ¢, 4 2], Pefion [5 g, 2 9], Tacubaya [1 3, 2 2), Jalapa [4 6,1 2] (Barrett, 
colls. Adams, P. P. C.), Orizaba (H. H. Smith and F. D. Godman: 5 3,2 2), Santa 
_ Maria, Puebla (Barrett, coll. P. P. C.: 1 3,2 2), Cuernavaca *, San Angel (Deam). 
In California February to October, in Mexico March to December, are the dates of 
capture for the above-quoted material. 
* Two abnormalities in venation may be mentioned here:—One male from Patzcuaro has only one ante- 
cubital on the right hind wing, situated at the level of the submedian cross-vein. One female from Orizaba 
has the first antecubital on the right hind wing only about as far from the second as the costal space is wide, 
and it crosses only the costal, not the subcostal, space. 
+ In this list, unless “ bl. 2 ” is expressly stated, the figures given are for orange females. 
