LOCUSTID^E. 285 



Fam. LOCUSTIMI*. 



This large family has been divided by Brunner von Wattenwyl into numerous 

 subfamilies in a very natural way. It differs from the Gryllidae in the four-jointed 

 tarsi (the tarsi of the Gryllidae having three joints only), and in the form of the 

 stridulating-organ of the males, which, when present, is much reduced and confined to 

 the anal field of the elytra. 



The Gryllacrinae and Stenopelmatinae form in the family Locustidae a separate section, 

 presenting a kind of link to the Gryllidae. Indeed, in these two tribes the elytra 

 are still, as in the Gryllidae, divided into two fields — a lateral and a dorsal field, 

 this latter being formed by the fusion of the discoidal and anal fields. But in these 

 insects the two fields are not so well separated as they are in the Gryllidae ; and the 

 elytra being more or less membranaceous they mould themselves, when at rest, on the 

 body of the insect, becoming somewhat convex on the back, and forming a sort of 

 cylindrical case to the abdomen. The venulation of the elytra has also some analogy 

 with that of Gryllidae, all the longitudinal veins being well separated from their base, 

 which is not the case in other tribes of Locustidae. 



Tribus STENOPELM AT1N.E f. 



Stenopelmati, Brunner v. Wattenwyl, Monogr. der Stenopelm. und Gryllacr. p. 9 (1888). 



Tarsi compressi (articulis primo et secundo laminis lateralibus nullis). Tibiae anticae supra in utroque margine 

 spina apicali instruct®. Tibiae posticae supra in utroque margine necnon subtus utrinque spinis apicalibus 

 duabus instruct®. (Brunner.) 



The Stenopelm atinae are mostly apterous insects, very few of the species belonging 

 to it being furnished with wings. 



The males are destitute of a musical organ in the elytra ; nevertheless many of the 

 species possess tympani on their anterior tibiae in both sexes, which proves that these 

 insects stridulate in some way. Brunner von Wattenwyl has shown that musical 



* By Dr. Henri de Satjsstjre and Alphonse Pictex. 



t Principal work referred to for the Stenopelmatinae : C. Brtoker voir Wattenwyl, Monographic der 

 Stenopelmatiden und Gryllacriden, pp. 1-150 (Verh. zool.-bot. Ges. Wien, 1888, pp. 247-394). This 

 excellent work forms a very complete monograph of the Stenopelmatinae and Gryllacrinse, and we have 

 followed it throughout. Several of the synopses of species here given to help the identifications have been 

 partly extracted from it with some modifications which were required for the introduction of the new 

 species. 



