224 
GENUS NEONEURA (oDONATA) 
the superior appendage are more convex in sylvatica, and form a 
less regular triangle than is the case in ethela. From the closely 
related mariana and dentiailata, ethela is more distinct, the ap- 
pendages furnishing specific characters. In mariana and den- 
ticidata the upper branch of the superiors is longer; in mariana 
the lower branch is rounded, the apex semicircular, not triangu- 
lar as in ethela. 
In thoracic color pattern ethela is strikingly like mariana and 
entirely different from sylvatica, but in view of the limited material 
available these differences must not be given too ‘much weight; 
while the pattern is similar in mariana and ethela I believe that 
certainly the pale color of ethela is blue or bluish as in sylvatica. 
Material of sylvatica and ethela seen by me seems equally mature, 
and the strikingly blue basal alxlominal color of sylvatica is 
entirely wanting in ethela. As the red on the alxlomens of speci- 
mens is about equally intense, it is probable that the difference 
in the basal segments is specific and not ontogenetic. See text 
under discussion of maria. 
Neoneura mariana new species (Figs. 8, 9, 40, 41, 81, 82 and 101.) 
Abdomen, (J' 28.5 to 31 mm., average 29.7; 9 28: hind wing, cf 19 to 20.5, 
average 20; 9 21. 
c?. — Genae light reddish browm. Labrum and rhinarium reddish brown, 
labrum with a median basal dark or black spot. Nasus black. Frons in front 
dark shining reddish brown, darker above. Frons above and vertex colored 
almost exactly as in myi'thea with only the following exceptions: in myrthea 
area between the eye and antenna is black, in mariana reddish brown; the 
reddish brown spot between the lateral ocellus and antenna is usually in 
mariana divided into two contiguous spots; and the occipital crest is reddish 
brown or black. In one specimen the spots are unusually large and there is an 
additional spot at either end of and anterior to the occipital crest, but not as 
far anterior as the lateral ocellus. Antenna black or very dark brown. Rear 
of head black, a narrow border of brown against the eyes. 
Prothorax black; front border narrowly reddish yellow; middle lobe with 
two longitudinal reddish yellow spots on either side; posterior lobe with ex- 
treme external edge pale or black. Propleuron largely black, lower posterior 
border and an irregular central area reddish yellow. 
Thoracic dark colors above black, with a scarcely discernible trace of red, 
the lateral dark markings showing but a slight trace more; dorsal pale mark- 
ings dark reddish yellow, growing paler and more yellowish below. 
Abdomen red; segment one basally above and on the sides, but not 
reaching the lower edge, black, pale color yellowish red above to yellow 
below, a lateral apical black spot; segment two with sides yellowish red, a 
