460 
ZOOLOGICAL LITERATURE. 
Mipaocus weatwoodiij sp. n., M^Lachlan, I, c. p. 274 (ssPaocus 4:-maeulatuSf 
Westw. nec Latr.). 
Libellulid^. 
Landois (Zeitschr. fiir wiss. Zool. xvii. pp. 167-169) notices a peculiar 
sound-producing organ in the LihelluUdat, and figures that of JEschna juncea 
(pi. 11. fig. 20). It is situated in the prothoracic stigmata, which are 
placed quite at the front of the thorax, and concealed hy the head. These 
stigmata are large elongated slits, one margin of which is simple, whilst 
the other hears a sort of chitinous comb of about 20 teeth, between which 
an exceedingly delicate membrane is extended. The metathoracic stigmata, 
which in general are the chief organs of sound in this part of the body, 
are smaller, and bear on one side a semilunar valve with stiff hairs. 
A. S. Packard gives a general account of the natm’al history of the in^ 
sects of this family, with especial reference to North- American species 
(Amer. Nat. i. pp. 304-813). He figures the lower surface of the head 
(p. 307. fig. 1) and the extremity of the abdomen (p. 308. fig. 2) of the 
larva and the pupa of JEschna and Diplax (p. 309. fig. 3 & p. 311. fig. 4), 
and refers to and figures the following species (I, c. pi. 9) ; — Libelhda trima^ 
culata (De G.), fig. 1 j X. quadrimaculata, fig. 2 j Diplax herenice (Drury), 
figs. 3 & 4j J). elisa (Hag.), fig. 6j Nannophya hella (Uhler), fig. 6j and 
Agrion saudum (fig. 7). 
Neurothemia. Brauer proposes this name for the genus Polyneura (Ramb.), . 
the latter name being preoccupied in Rhynchota (Verb, zool.-bot. Ges. in 
Wien, xvii. p. 6). He gives a list of the species referred by him to the 
genus (/. c.pp. 7-8), several of which are new; but this is modified by the 
suppression of some of his new species in a subsequent paper on the occur- 
rence of dimorphism in the females of some of the species. 
Brauer (Verh. zool.-bot. Ges. in Wien, xvii. pp. 971-976), indicates the 
occurrence of dimorphism in the females of some species of the genus Neu- 
rothemis {^Polyneuray Ramb.), some of them having the wings very richly 
veined, as in the males, whilst others have widely netted wings like those 
of the ordinary Lihellulce, He mentions that a similar dimorphism occurs 
in the genus Ischnura. He explains the phenomenon, on Darwinian prin- 
ciples, by the supposition that the close netting of the veins is a secondary 
sexual character in the males, so that the heteromorphous females are the 
normal form, and the isomorphous ones (which are less numerous in the 
collections) females wth male habit. He indicates the species which he 
refers to the genus as follows, some of them having been described in an 
earlier paper, as indicated below : — 1. N. gigantea (Br.) ; 2. N. sophronia 
(Dr.) =fidvia (Dr., Burm.) j 8 . N. palliata (Ramb.), incl. ram 6wm (Kaup, 
Br.), ceylanioa (Br.), and decora (Br.) j 4. N. elegana (Gu^r.) = P manadensia 
(Boisd.) ; 6. N. pseudosophronia (Br.), incl. diplax and innominata (Br.), 
and oculata and aiigmatizana (Fab.), the species will therefore bear the name 
of N. octdata (Fab.) ; 6. N. jluctuana (Burm.)=qpjcahs (Ramb.) ; 7. N. nico- 
harica (Br.) j 8. N. equestris (Fab.) j 9. N. feralis (Burm.) ; 10. N. oligo- 
near a f sp. n. 
Hagen has submitted some species of this family, described in 1867 
and 1858 by Uhler, to a synonymic revision (Stett. ent. Zeit. 1867, pp. 87- 
96), founded chiefly upon types sent to him by that author. The species 
noticed are : — Lihelhda speciosa (Uhl.)=i. alUstyla (S^lys), which is identical 
