ARACHNOMIMUS. 251 



ARACHNOMIMUS, Sauss.* 

 Arachnopsis, Saussure, Melang. Orthopt. 6 e fasc. pp. 537, 582 (1878) (nomen prseocc). 



This very remarkable genus is unfortunately only known from immature specimens, 

 It is, however, well characterized by its very long legs. The anterior tibise are destitute 

 of drums, as in the genus Cophus, from which Arachnomimus differs in the form of 

 the pronotum. The spurs of the hind tibiae are like those of Amphiacustes: the 

 superior inner spur is much shorter than the intermediate spur, a character separating it 

 from Phalangopsis (another imperfectly known genus). Arachnomimus may be known 

 from Phalangopsis and Endacustes by the fact that the superior part of the facial shield 

 is broad, as in Amphiacustes, while in the neighbouring genera it joins the vertex by a 

 narrow process. The females are certainly apterous, and the males are not unlikely 

 to be apterous also. These insects are most interesting as representing the cavicolous 

 type of the Gryllidee, imitating the very slender forms of the Locustidse which live in 

 caves f. The genus was known only from India, but it will probably be found in 

 the caves of different parts of the world. The name Arachnopsis being preoccupied 

 in Crustacea, it is necessary to change it. 



1. Arachnomimus Cavicola, sp. n. (Arachnopsis cavicola, Tub. XII. fig. 23.) 

 $ mbimago. Apterus, gracilis, fulvo-ochraceus, superne obsolete brunneo umbra tus. Antennae concolores. 

 Caput anterius in medio fusco-rufo umbratum. Cranium brevissimum, transversum. Vertex inter 

 scrobicula antennarum anguste productum. Scutelli facialis processus quam primus articulus anten- 

 narum duplo latior, margine supero incisura minuta utrinque, lobo medio retroflexo, ac in piano supero 

 cum rostro vertieis conjuncto. Primus articulus antennarum grandis, quam latus fere duplo longus. 

 Oculi anguste piriformes. Palpi longi; ultimo articulo apice oblique infundibuliformi. Pronotum 

 sellaeforme, in dorso impressionibus nonnullis ; lobis lateralibus obliquis, scilicet margine infero postice 

 adscendente, subarcuato, angulo anteriore valde rotundato. Pedes gracillimi, longissimi, obsolete brunneo- 

 fasciati. Tibiae anticae tympano nullo. Femora postica fere dimidia parte apicali linearia. Tibiae 

 subtilissime spinulosae, spinis mobilibus 4 : 4 brevibus. Calcaria gracilia ; interna : intermedium longum, 

 brevius tamen quam dimidium metatarsum ; superum illo dimidio brevius ; inferum minutum. Calcaria 

 externa brevia: intermedium quam interno-superum brevius, reliqua 2 minuta. Metatarsi omnes 

 longissimi; postici piloselli, superne inermes vel in margine externo apicem versus spinulis obsoletis 

 instructi. Abdomen subcylindricum ; lamina supra-analis elongato-trigonalis, apice rotundata, margini- 

 bus reflexis. Cerci longissimi. Lamina infra-genitalis trapezina. (Ovipositor verisimiliter elongatus.) 

 $ nympha, Long. corp. 11 ; pronot. 2*2 ; fern. post. 10*8 ; tib. post. 12 ; ovipos. 3 millim. 



Hah. Guatemala, Cave of Lanquin in Vera Paz (Champion). 



The only specimen captured by Mr. Champion is unfortunately immature, but, except 

 the ovipositor, which is still short and thick, it is evident that all the described characters 

 would be found in the imago. 



Tribus (ECANTHINLE. 

 (Ecant kites, Saussure, Melang. Orthopt. 6 e fasc. pp. 538, 590. 



Delicate insects of whitish-green colour and slender forms. The legs not much 

 * apa^yt), aranea; ^i?/ios, imitator. t Compar. Amphiacustes phalangium, p. 249. 



2Kk2 



