304 OKTHOPTERA. 



apicali granulosa in longitudinem sulco divisa ; area supera carinulis obliquis granulosis obsita ; latere 

 interno supra, basi excepta, dentato-granuloso. Margo inferior-extern us spinis majoribus crassis 5-7 

 minoribusque interealatis ad exteriorem deflexis. Margo internus spinis minus inaequalibus, minus 

 numerosis (eirc. 12), magna parte ad interiorem deflexis, armatus. Tibiae graciles, arcuatae, supra in 

 utroque margine tota longitudine spinulis eonfertis armatae spinisque brevibus, conicis interealatis 3:4 

 subtus tuberculis rotundatis, apice spinula minima incumbente (intus 12-13, extus apice 4) prseditae 

 Calcar intermedium in utroque latere quam altera triplo longius ; internum | longitudinem metatarsi 

 aequans. Lamina supra-analis transverse trigonalis (vel rotundata). Cerei crassi breves, subtus sulcati 

 apice extus in dentem brevem truncatam producti. Lamina infra-genitalis apice lata truncata. 

 S • Long. corp. 20 ; pronot. 5*5 ; femor. post. 18*5 millim. 



Figures : — Fig. 2, tbe male insect. — Fig. 3, the hind leg, seen from outside, magnified. 



Hob. Mexico, Amula in Guerrero 6000 feet (H. H. Smith). 



Tribus GRYLLACRINAE * 



Tarsi depressi. Tibia? anticaa foraminibus (tympanis) destitutse, supra spinis apicalibus nullis. Tibiae posticae 

 supra in utroque margine spina apicali, subtus utrinque spinis apicalibus 2 instructae. Articuli primus 

 et secundus tarsorum utrinque lamina laterali sulcata instructi. (Brunner.) 



The insects of this section are remarkable on account of the development of their 

 wings. The elytra are generally long, the wings wide and rounded. The former are 

 membranaceous, and their venulation very complete and evident, the longitudinal 

 nervures being well separated from each other in their entire length, and very easily 

 distinguishable. In consequence, the neuration of the elytra is far from being so 

 characteristic as it is in the Gryllinae. 



The Gryllacrinae are certainly related to the Gryllinae, but, taken as a whole, they have 

 greater powers of flight ; yet they present also, like the Gryllinae and the Stenopelma- 

 tinae, a fossorial type. This is found in the genus Schizodactylus, a most extraordinary 

 insect, imitating in form and appearance a large Gryllus, the elytra resting flat on the 

 back, with the lateral field deflexed perpendicularly on the sides and separated from 

 the dorsal field by a sharp ridge. This type forms an evident passage to the Gryllinae 

 by its general facies, although the positive characters and the venulation of the elytra 

 are those of Gryllacrinae, and generally it is the left elytron which in rest covers the 

 right one, as in other Gryllacrinae ; but these insects (like the Gryllinae) can place at 

 will either elytron uppermost. 



The Gryllacrinae are not musical insects. The males possess no tambourine on the 

 elytra, and neither sex has tympani in the anterior tibiae. The elytra in repose rest on 

 the dorsum of the abdomen, and they seem to be too long and too membranaceous to 

 support a tambourine, unless very small and basal. In the genus Schizodactylus one 

 certainly might have been developed and extended to the whole elytra, these organs 



* Principal work referred to for the Gryllacrinae : — 



Ch. Brttnnek von Wattettwtl, ' Monographie der Stenopelmatiden und Gryllacriden,' 1888. (Comp. anted, 

 p. 285.) 



