1863.] 
235 
rax is normally in the mature insect ‘‘blue, somewhat varied with green¬ 
ish and violaceous,” as Say describes it, or “bright metallic blue with 
greenish and subviolaceous reflections,” as Scudder describes it. In 
other words I believe that my specimen is more or less immature and 
that Say’s typical specimens were fully mature. It will be noticed 
that in my description of the dorsum of the thorax, for convenience 
sake, I considered the pale color as the ground-color, and that both 
Scudder and Say consider the dark color as the ground-color. In one 
remarkable point Say’s description comes much nearer to mine than to 
Mr. Scudder’s. Say speaks of “ a yellow vitta on the thorax, behind 
bifid and. divaricated.” Scudder speaks merely of “ a yellowish-brown 
inconspicuous line on the dorsal and lateral sutures.” In my insect the 
dorsal pale vitta is about f millimetre wide and distinctly divaricates 
on the antealar sinus, (which I expressed by saying that the sublateral 
DARK vitta was “ slightly abbreviated,”) while on the other hand the 
PALE vitta on the lateral suture is about ^ a millimetre wide. The fol¬ 
lowing Table of the principal points of difierence in the three descrip¬ 
tions, will, I think, shew that in some other respects my insect comes 
nearer to Say’s description than does the typical Harrisian specimen 
as described by Scudder :— 
L. eurina. j 
Say. „ 1 
Scudder. | 
Walsh. 
Labrum. 
Yellowish. i 
Duteous. 
Obscure greenish, 
varied with dus¬ 
ty- 
Dark color of dor¬ 
sum of thorax. 
Plue, varied with 
greenish and vio¬ 
laceous. 
Bright metallic 
blue, with green¬ 
ish and subviola¬ 
ceous reflections. 
Fuscous. 
Pale color of dor¬ 
sum of thorax. 
Yellow. 
Yellowish brown. 
Rather pale brown. 
Femora, beneath. 
Whitish. 
Yellow. 
Yellowish towards 
the base. 
Tibiae. 
Black, with an ex¬ 
terior white line. 
Lower surface 
brownish green, 
1 upper surface fus¬ 
cous. 
Black, with an “ an¬ 
terior” yelloAvish 
vitta. 
Pterostigma. 
Blackish. 
1 Black. 
Brown. 
It may here be added that a sketch of the pleura of the Harrisian 
specimen obligingly furnished to me by Mr. Scudder, agrees exactly 
with the very remarkable design exhibited in my specimen, nothing 
