236 
[October 
approaching to which has been observed by me in other Agrionina. 
Mr. Scudder’s description of the design of the pleura also agrees ex¬ 
actly with mine, though the coloration differs. The rather pale 
brown ” vitta on the humeral suture in my specimen would have been 
more definitely and diffusely described as “ rather pale brown along 
the suture gradually shading into a dark fuscous color towards the 
yellow part of the pleura.” 
Note 23, p. 180.—I am now satisfied, from the examination of living 
Odonata, that the “ rhinarium” is merely a coriaceous hinge-like joint 
connecting the true, “nasus” or ‘‘epistoma” of Messrs. Selys and 
Hagen (or what I have erroneously supposed to be the lower half of 
the front) with the labrum. In Acheta Fabr. and British authors 
(== Gryllus of the modern Continental school), there is an almost exactly 
similar connection. Dr. Hagen states generally of the whole Legion 
Calopteryx, which includes Hetmrina, that the “rhinarium is almost 
obsolete, consisting of a folded membrane.” (^Mon. Calopt. p. 10.) In 
Coleoptera the subfamily Tenebrionidse is divided by LeConte into 
two primary groups, one of which has a similar coriaceous connec¬ 
tion between the anterior edge of the front, (which must be con¬ 
sidered, I think, as a clypeus with the clypeal suture obsolete) and 
the labrum. (Lee. Introd. Col. p. 224.) Latreille says of Cicada, 
“ Cum clypeo non confundendus marginis frontalis superi processus 
dilatatus. * * * [Clypeus] a labro pariter discernendus. Voces illee 
ssepius ah auctorihus confuse adhibitse [sunt.y’ (Glen. Crust, et Ins. 
III. p. 152, note.) It is evident from Prof. Westwood’s drawing of 
the head of Libellula that he considered the “ rhinarium” as the true 
epistoma; for he has entirely omitted the clypeal suture, apparently 
supposing it, as I formerly did, to be a mere ornamental stria and not 
a true suture connecting two distinct pieces of the head. (See Westw. 
Intr. II. p. 35, fig. 2.) 
Note 24, p. 180.—The following Odonatous species have occurred 
since the publication of my Paper in Proc. Phil. Acad. Sc. 
Agrion. 
A. dentiferum n. sp. ? (=signatum Hagen?) Brassy black. Head villose. 
Occiput with a transverse line, dilating into a cuneiform sjjot towards the eyes, 
pale-reddish-brown (fawn-color) in the dried specimen, orange-tawney in the 
living insect as well as all the other pale-reddish-brown parts ; all before a 
