The Fauna of British India, including Ceylon and Burma / edited by A.E. Shipley, assisted by Guy A.K. Marshall. Orthoptera. (Acridiidae) / by W.F. Kirby.

Date:
1914
Catalogue details

Licence: In copyright

Credit: The Fauna of British India, including Ceylon and Burma / edited by A.E. Shipley, assisted by Guy A.K. Marshall. Orthoptera. (Acridiidae) / by W.F. Kirby. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

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    INTEOUUCXION. lateral and sometimes the central carina are absent. Occasionally the central carina is raised into a ridge, or humped, and spines project from the front angles, or from the sides. On the upper surface of the pronotum we frequently meet with three or four transverse depressions or grooves, the position and extent of Fig. (•).—Side view of the pronotum of Criutcitix : a, pronotum, h, tegmen, V, costa of wing. which is of some importance in classification; as is also the shape of the deflexed lobes on the sides of the pronotum. [When there is a central carina it is sometimes complete, sometimes it is cut by one of the transverse grooves, and in some eases by two of the grooves]. Behind the pronotum we find the mesonotum and metanotum, followed by the nine segments of the abdomen. The first segment Fig. 7.—Side yiew of pronotum of: (A) Gastrimargiis, with central carina cut by one groove ; (B) Bryodema, cut by two grooves. bears a curious structure on each side which is regarded as an organ of hearing. [It consists of a cavity covered by a transparent membrane, filled with liquid, and is connected with a nerve Fig. 8.—Side view of the biiso of the abdomen of Schisiocerca, showing: a, tlie auditory organ. originating in the third thoracic ganglion.] Each segment, except the ninth, is provided with a spiracle on each side. There