RHYNCHOTA. 
475 
VoLLENHOvEN, S. C. Snellen VAN. Description de six esp^ces 
nouvelles crHemipteres Ileteropteres. Tjidschr. voor En- 
tom. 2**® ser. Deeliv. pp. 255-260, plate 11. 
Walker, F. Catalogue of Homopterous Insects collected in 
the Indian Archipelago by Mr. A. R. Wallace, with descrip- 
tions of new species. Journ. Linn. Soc. vol. x. Zool. 
pp. 276-330. 
Contains the Cicadellina, Psyllidse, and Coccidse. 
C. Anatomical and Physiological Papers. 
Balbiani, — . Memoire sur la generation des Aphides. An- 
nales Sci. Nat. ser. 5, tome xi. pp. 1-89, plate 2. 
Brandt, Alexander. Beitrage zur Entwicklungsgeschichte 
der Libelluliden und Hemipteren, mit besonderer Beruck- 
sichtigung der Embryonalhiille derselben. Mem. Acad. 
Imp. Sci. St. Petersb. tome xiii. no. 1, pp. 33, with 3 plates. 
Contains a description, with figures, of the embryogeny of 
Corixa, Hydrometray Aspidiotus, Lecanium, and Aphis. 
Landois, L. Anatomic der Bettwanze [Cimex lectularius, L.) 
mit Beriicksichtigimg verwandter Hemipterengeschlechter. 
Zeitschri fur Wiss. Zool. Band xix. pp. 206-233, plates 
18 & 19. 
Lepori, Cesare. Nuove Ricerche Anatomiche e Fisiologiche 
sopra Porgano sonoro delle cigale. Bull. Soc. Ent. Ital. i. 
pp. 221-238, pi. 5. 
ScHioDTE (Naturhist. Tidsskrift, 3rd ser. vi. ; Ann. Mag. 
Nat. Hist. ser. 4, vi. pp. 225-249) discusses certain points in the 
structure of the Rhynchota upon which, he considers, the classi- 
fication of that order should to a great extent be founded. After 
referring to the neglect with which characters derived from the 
epimera have been treated, he indicates that the form and mode 
of articulation of the coxse are of the highest importance in the 
(economy of the animals, and therefore should have a corre- 
sponding value as classificational characters. He distinguishes 
two forms of coxse as occurring in insects, namely : — coxce car- 
dinat(£, which are either immovably connected with the body, or 
capable of slight motion from side to side or backwards, the 
diminution of mobility superinducing a reduction in the size of 
the epimera and sternum, whilst the coxa itself becomes enlarged; 
and coxoi rotatoria!, which can be turned round on their own 
axis, and the muscles attached to which> requiring space, cause 
a corresponding enlargement of the epimera and sternum. Both 
forms may occur in the same animal; and then it is usually the 
first, or first and second pairs of limbs that have rotatory coxse. 
When the limbs which serve for progression have cardinate 
coxse, the author proposes to name the animals Pagiopoda ; 
