80 CONTENTS. OF EACH VOLUME. 
in 1894-1903, and 317-322 in 1909, the conclusion of the Volume having been 
delayed for several years by the American contributer who had volunteered to 
determine the Jasside, Bythoscopide, &c. The MSS. and material not being forth- 
coming, the volume was closed as it stood. ‘The twenty-one coloured plates, ten 
of which are devoted to the extraordinary insects known as Membracide, include 
figures of 494 species, a list of which is given in the Introduction, pp. vii-xi. The 
Index for Vols. L. and II. is also issued in this volume, pp. 823-339. The Supplement, 
pp. 818-322, contains notes on the 29 species added by Buckton and others during 
the progress of the work. 
Part 2 of this Volume, by Prof. T. D. A. Cockerell, issued in 1899 (the separate 
Index, pp. 35-37, was not published till 1909, when Volume II. was closed}, gives 
a list of the 161 Aleurodide and Coccide from Mexico and Central America known 
to the author at that date. Eleven species and two genera are described as new, 
and nive forms are figured in the text. With these insects, the total number of 
Homoptera recorded from Central America is 1143. 
[The few specimens of Thysanoptera obtained have been examined, and some of 
the species described, by Mr. R. S. Bagnall (Journ. Linn. Soc., Zool. xxx. pp. 869- 
387, pls. ii., iii, 1910). Mr. D. L. Crawford has also recently written various papers 
on ‘Thysanoptera of Mexico and the South’ (Pomona Jonrn. Ent. i., ii. 1909-1910). | 
50. Nevroprera: Ephemeride by A. E. Eaton; Odonata by P. P. Calvert. 
The Rev. A. E. Eaton’s account of the Ephemeride, based upon very few specimens, 
was published in 1892; that of the Odonata by Prof. P. P. Calvert, with abundant 
material, in 1901-1908 *. Altogether 308 species are enumerated: Ephemeride 32 
and Odonata 276. Prof. Calvert’s Introduction, pp. v-xxx (published in 1908), 
mainly consists of two Tables: (A) ‘ Alphabetical List, by countries, of the localities 
in which the Odonata were collected,’ and (B) ‘‘ Systematic list and distribution of 
the species and varieties,’ 293 in all; anda coloured map to show the actual distri- 
bution of mean annual temperatures. ‘Table A gives the name of the Department, 
Territory, or State to which each locality belongs, the elevation of these places in 
metres and feet, the names of the collectors, the dates of capture, general remarks, &c. 
Table B shows the geographical distribution and the temperature zones in which 
the species occurs in each country, this being further illustrated by the map. The 
composition and ecological relations of the Odonate fanua of Mexico and Central 
America have been discussed by Mr. Calvert elsewhere [ Proc. Acad. Nat. Sci. Phil. 
(1908) 1909, pp. 460-491, pl. xxvi.]. He has since visited Costa Rica, May Ist, 
1909-May 9th, 1910, to collect data on (1) the seasonal distribution of the Odonata, 
* The Odonata were undertaken successively by Mr. McLachlan and Prof. Karsch, before Prof. Calvert 
procceded with the work. 
