AMPHIACUSTES. — ENDACUSTES. 249 



Pedes longi, brunneo marmorati. Tibiae posteriores supra spinis 3 : 4. Lamina supra-analis parallela, 

 incisa. 

 Long. corp. 16 ; pronot. 3*3 ; elytr. 7 ; fern. post. 17 millim. 



Hab. Antilles, Guadeloupe I. (Mus. Genavense).'] 



4. Amphiacustes phalangium, Sauss. (Tab. XII. fig. 19.) 



Amphiacusta phalangium, Sauss. Miss. Scient. Mex., Orthopt. p. 450 (<?) ; Melang. Orthopt. 

 6 e fasc. p. 571. 



(? . Corpus parvum, rufo-ferrugineum. Scutelli facialis processus verticalis quarn primus articulus antennarum 

 latius. Verticis rostrum primo articulo antennarum fere dimidio angustius ; vertex utrinque ad ilium 

 excavatus sicut in A. cardibeo. Pronotum supra impressione transversa late trigonali notatum, lobis 

 lateralibus obliquis, angulo antico valde rotundato. Elytra minora, dimidium abdomen liberantia, parum 

 lata, parum diapbana, venis obliquis 3 ; vena postanali recta, ramulum nullum emittente ; v. postaxillari 

 sigmoidali ; speculo subrhomboidali aeque longo ac lato, per venas 1 vel 2 diviso ; campus lateralis venis 

 costalibus circ. 8. Pedes longissirai, gracillimi ; femora antica corpore aequilonga ; postica tantum dimidia 

 parte basali incrassata. Tibiae anticae utrinque foramine minuto, frequenter obliterate Tibiarum 

 posticarum calcar interno-intermedium paulo brevius quam dimidius metatarsus ; calcar superum quam 

 intermedium fere dimidio brevius. Metatarsus spinulis 3 : 8 crenatus. Lamina supra-analis elongato- 

 trapezina ; lamina infra-genitalis apice subincisa. 



Var. Elytri speculo tantum postice per venas 2 transversas diviso, de reliquo variabili. 



rf . Long. corp. 1*25 ; pronot. 3 ; elytr. 5*3 ; fern. ant. 14 ; fern. post. 21 ; tib. post. 20 millim. 



Hab. Guatemala (Mus. Genavense). 



A very remarkable species, on account of its enormously long and thin legs, 

 exaggerating the extreme forms of Arachnomimus, imitating those of the cave 

 Rhaphidophora. This insect might be equally well placed in the genus Arachnomimus, 

 the anterior tibiae being often destitute of a tympanum on both sides. When an insect 

 takes an exaggerated aberrant form, the generic characters often show a tendency to 

 become more or less effaced by the effect of adaptation (the same remark applying also 

 to the specific characters — vide varietatem). 



ENDACUSTES, Brunn. 



Endacusta, Brunner v. Wattenwyl, Mittheil. Schweiz. ent. Ges. iv. p. 167 (1873). 

 Endacustes, Saussure, Melang. Orthopt. 6 e fasc. pp. 537, 575. 



The diagnosis of this genus requires modification : — The inner spurs of the hind 

 tibiae are variable in size, the superior spur being sometimes shorter, sometimes longer 

 than the intermediate one. In E. irrorata the superior spur is the longest; in the 

 Mexican species it is the intermediate one which is the longest, as in the genus 

 Endecous. Endacustes differs, however, from that genus in the relative length of the 

 outer spurs — the superior spur being the longest in Endecous, and the intermediate one 

 in Endacustes. The two genera are very closely allied, and might be treated as one. 



biol. cente.-amer., Orthopt., March 1897. 2 xk 



