248 OETHOPTERA. 



planula, utrinque sinuata, apice truncata, in sinibus utrinque processu cylindrico instructa. Cerci fusci. 



Lamina infra-genitalis longiuscula, maxime eonvexa, saceuliformis, in medio impressione fusiformi, apiee 



subincisa, excavata, ad superum reflexa. Titillatores 2 apice extus acute dentiformes. 

 Long. corp. 15-5 ; pronot. 2-5 ; latit. 5 ; elytr. 10-5 ; latit. in dorso 7*5 ; fern. post. 15-5 millim. 

 Figures.— Fig. 14. The male insect.— Fig. 15. The dorsal field of the elytron ; s, the speculum, divided by two 



veins; a', the postanal vein. — Figg. 16, 17. Titillator seen from both sides. 



Amphiacusta azteca, var., Sauss. Miss. Scient. Mex., Orthopt. p. 450, var. ? . 



2 . Fusco-castanea, subtus fulvescens ; pronoto et abdomine supra linea longitudinali lutea. Pedes fusco et 

 luteo annulati. Femora postica fulvo-testacea ; extus inferius oblique fusco lineata, superne vitta longitu- 

 dinale fusca (sicut in azteco). Lobi laterales pronoti rotundati, minus angulati quam in azteco, angulo 

 antico latius rotundato. 



2 . Long. corp. 16 ; pronot. 4 ; fern. post. 19 ; ovipos. 17-18 millim. 



Hab. Mexico, Omilteme in Guerrero 8000 feet (H. H. Smith), Cordova (Saussure). 



A species closely allied to A. aztecus, from which it may be known by the vertex 

 having a broader rostrum, especially in the males ; the inferior margin of the lateral 

 lobes of the pronotum less straight and not oblique ; and the larger, differently formed 

 male elytra. In A. aztecus the elytra of the males have four or five oblique veins only ; 

 the speculum is nearly symmetrical, its anterior margins being not very unequal ; the 

 lateral field has only 8-12 costal veins, which are rather irregular and obsolete, and not 

 incrassated at the ends ; the supra-anal plate is destitute of a process ; and the infra- 

 genital plate is shorter. 



2. AmphiaCUSteS azteCUS, Sauss. (Tab. XII. fig. 18.) 

 Phalangopsis azteca, Sauss. Rev. et Mag. Zool. ix. p. 209 (?) (1859). 

 Amphiacusta azteca, Sauss. Miss. Scient. Mex., Orthopt. p. 449. 4 ( S $ ) {A. mexicana, per 



errorem), t. 8. figg. 39, 39 a ( $ ) . 



Quam A. toltecus minus crassus ; fusco-testaceus, rostro verticis angustiore ; lobis lateralibus pronoti paulo 

 minus rotundatis. Elytra marium minora, dimidium abdomen liberantia ac minus lata ; speculo minus 

 asyrametrico ; venis obliquis 4-5 ; vena postaxillaris l a ramulum brevem transversum ad venam 

 diagonalem emittens. Lamina supra-analis utrinque in marginibus lateralibus angulum prominulum 

 prasbens. — Of. Synops. spec. II., supra p. 246. 



Aberratio. Elytrorum <3 vena postanalis venulam subtilem ad speculum emittens. 



Figure. — Fig. 18. The terminal joints of the maxillary palpus, characteristic of the genus. 

 Hab. Mexico, Vera Cruz, Cordova, Orizaba (Saussure). 



[3. Amphiacustes caraibeus, sp. n. 



Amphiacustes aranea, var., Sauss. Me"lang. Orthopt. 6 e fasc. p. 572 (6). 



<$ . A. azteci staturse et formis, pedibus tamen longioribus. Fulvescens. Caput cranio brevi, transverso, 

 rotundato, vertice anterius depresso, detruso, a rostro per sulcum transversum sejuncto ; rostro horizontali, 

 angusto, subsulcato ; scutelli facialis processu interantennali itaque angusto. Palpi gracillimi, longissimi. 

 Pronoti lobi laterales, margine infero subrecto. Elytra minora, sicut in A. azteco, vix dimidium abdomen 

 tegentia. Vena postanalis basi arcuata, prope basin ramum venae diagonali parallelum ad speculi 

 angulum emittens. Venae obliquse 4. Speculum vix transversum, symmetricum, angulo antico subrect- 

 angulo ; per venam unicam extus arcuatam, utrinque in margine postico speculi exsertam, divisum. 



