NEUROPTERA. ‘389 
(intermediate between black, or homceochromatic, and orange, or heterochromatic). A specimen from Ocotlan 
has the following characters of the black females: second antennal joint black, pale postocular spots not 
confluent with the pale colour of the rear of the head, pale antehumeral stripe narrow, interrupted near 
its upper end so as to have the form of an inverted !, and the following features of the orange females ; 
nasus partly green, middle prothoracic lobe with a curved yellow stripe on each side, abdominal segments 
8 and 9 black on dorsum. A female from Jalapa has the two following “ black” characters : pale postocular 
spots not confluent with the pale colour of the rear of the head, pale antehumeral stripe complete but 
narrower than in orange females, but its other characters are those of the “orange” form. A female 
from Guadalupe, otherwise of the heterochromatic form, has the pale postocular spots not confluent with 
the pale colour of the rear of the head. 
© (orange or heterochromatic). Of ten females taken pairing at Jalapa, Sept. 11, 1906, by myself, seven 
have abdominal segments 8 and 9 entirely black dorsally ; the other three evidently had the dorsum of 
these segments blue with the black stripe each side, but the blue is darkening so as to approach the 
totally black condition, thus supporting the suggestion made (anted, page 127) that the totally black state 
is indicative of greater age. 
A vulvar spine is absent in the great majority (32) of these supplementary females ; the exceptions are four 
heterochromatic examples (Jalapa 2, Toluca 2) which have a spine or a rudiment of a spine. 
The following comparison of examples of this species from Jalapa (4500 feet, 1370 metres) and from Toluca 
(8600 feet, 2625 metres) shows that the latter are slightly larger and have some tendency toward an 
increased number of postcubitals. The data from both localities lend some support to the statements 
made (anted, page 127) as to the greater number of postcubitals in the more southern Mexican examples 
as compared with those from the United States, and as to the tendency of the females toward a greater 
number of postcubitals than exists in the males, 
Percentage of wings having the following respective numbers 
of posteubitals :— 
Length of abdomen | Length of hind wing 
in mm. in mm. ; 
Front wings: Hind wings: 
Range. | Average. Range. Average. | 11. | 10. 9. 8. 7. | 10. | 9. 8. 7. 
16 | 56 | 26 2 oe 2 24 | 64 8 
25 SS ueeeee 18:5-22| 20°6 |13°5-15°5) 145 
15 het. 9 Q....} 19-22 21:07 | 16-18 16-6 | 33:3) 40 | 26-7) .. ee 6-7 | 33°3; 50 | 10 
20 dS veces 18-205) 19°6 | 125-15} 138-6 .. | 45 | 45 | 75] 2d] .. 15 | 67:5) 17-5 
12 het. 9 @....| 19-21°5) 20:3 | 145-16 15:3 4-2 | 66°7| 20°8) 83) .. .. | 166} 66°6| 16°6 
To the localities given, add :—Mexico, Guadalajara [ McClendon; 1 ¢ | and Ocotlan 
[3 ¢, L bl. 9, 2 or. @] in Jalisco, Yurecuaro [1 or. ¢ ] in Michoacan, Toluca [30 ¢, 
1 bl. 2,17 or. 2 | (Calvert, coll. P. P. C.), Gaudalupe (Tower, coll. P. P.C.: 3 or. 2 | 
in the Distrito Federal. 
This species and I. demorsa were found at the same ditches at Yurecuaro and at 
Toluca. 
BIOL. CENTR.-AMER., Neuropt., November 1907. 8e 
