228 
GENUS NEONEURA (oDONATA) 
largely bright red. In the form of the appendages it is most like 
mariana, and yet definitely distinct. The most striking difference 
is in the lower branch of the superior appendage seen on the 
interno-posterior face. In mariana this is an almost symmetrical 
smooth round tubercle^, well marked off at its base from the 
upper branch of the superior; in denticulata the lower l)ranch is 
a continuation, after an acute angle, of the lower edge of the upper 
part, and it is not at all a tubercle, but is a small roughly triangu- 
lar plane, with the exposed sides thickened and rounded, the 
posterior edge (just beneath the u]’)per part of the superior) 
armed near its middle with two juxtaposed black teeth. The 
upper branch or part of the superior is slenderer in denticulata 
than in tnariana, and there is a small median tooth on the upper 
edge in the latter which is wanting in denticulata. The lower, 
internal expanded plate of the upper part of the superior is alike 
in both species, acute triangular in shape and moderately de- 
veloped. In profile view the meeting of the upper and lower 
branches of the superior appendages is much more al)rupt and 
angular in denticulata than in mariana. The specific name refers 
to the two minute teeth on the lower branch of the superior ap- 
pendage. The gizzard has been described by Miss Higgins.® 
Neoneura myrthea new species (Figs. 11,12, 46, 47, 84, 85 and 102.) 
Abdomen, cf 23 to 24.5 mm., average 23.8; 9 22: hind wing, 16 to 17, 
average 16.4; 9 IS. 
d '. — Genae dark reddisli brown. Labrnm black, lower border, for a varying 
width, dark reddish brown. Rhinarinm dark reddish brown or black. Nasus 
black. Frons in front reddish black. Frons above and vertex black, a minute 
scarcely discernible reddish brown spot between the lateral ocellus and the 
antenna, a similar si)ot against the eye opposite the ocelli, and another similar 
spot against the eye near the extreme rear of the head; occipital crest with or 
without a reddish brown spot on either end. Antenna very dark brown or 
black. Rear of head black; a very narrow margin of dark brown against the 
eyes. 
Prothorax black; extreme anterior border, posterior lateral margins of 
middle lobe, and extreme border of hind lobe, brown; a minute scarcely dis- 
cernible brown sj)ot on either side of the middle lolie at its posterior liorder. 
Propleuron with its anterior third black, posterior two-thirds reddish lirown. 
Thorax above metallic red black, meseiiimeron largely the same color, shad- 
ing at the borders into black or the darker area entirely black; the metathorax 
®In other views a minute, dorso-internal, shining tubercle or low tooth may 
be detected on it. 
‘•'Proc. Acad. Xat. Sci. Phila., p. 137, (January, 1901). 
