402 ORTHOPTEEA. 



d 1 . Cerci breves, acuti, laminae infra-genitali triplo breviores. Lamina infra-genitalis dimidia parte apicali 

 fissa, parte basali lata, planula, ejus valvae apicales subtus contiguae, a latere tota longitudine dilatatae, 

 superne excavatae, simul sumptae foveolam ovatam formantes, apice contiguae, planulae, trigonales ; 

 a latere ampliatione elongato-ovata, parte basali aequilonga. Lamina supra-analis transversa, in medio 

 minute trigonali-producta, puncto crasso nigro notata. 



2 . Long. 12 ; pronot. 3 ; elytr. 17 ; femor. post. 10 ; ovipos. 3 millim. 



c? . Long. 9; pronot. 3; elytr. 16; femor. post. 9-5 millim. 



Hab. Mexico, Vera Cruz, Teapa in Tabasco (H. H. Smith) ; Panama, Punta de 

 Sabana, Isthmus of Darien. — Guiana ; Amazons ; Beazil. 



This species is well distinguished by the form of the anal appendages : the cerci are 

 short, and the two apical branches of the infra-genital plate are dilated throughout 

 their entire length. 



4. Thysdrus mexicanus, sp. n. 



Luteo-viridis. Antennae concolores, basi anguste fusco-annulatae. Pronotum gracile, elongatum, antice haud 

 reflexum, postice rotundatum, processu minus longo quam lato, marginibus loborum lateralium postice 

 obliquis, rectis, ad humeros pone angulum haud sinuatis. Elytra femora postica paulum superantia, 

 hyalino-thalassina. Vena mediastina dimidiam longitudinem campi marginalis attingens. Yenulae 

 transversae campi marginalis circ. 12 subperpendiculares ; areae reliquae venis parallelis remotis instructae ; 

 illis campi discoidalis subperpendicularibus ; illis campi analis leviter obliquis ; apex elytri late reticulatus. 

 Alae vitreae, venis virescentibus, elytra longe Buperantes. Femora antica spinis 3:4; femora postica apice 

 subtilissime spinosa. Tibiae anticae leviter arcuatae, spinis 5:5; intermediae margine antico spinis 2. 

 Cerci teretes, graciles, recti. 



2 . Ovipositor brevis, validus. Lamina infra-genitalis rotundato-trigonalis ; lamina supra-analis postice 

 impresso-deflexa, in medio lobo rotundato minuto. 



S . Lamina supra-analis quam longior duplo latior, carinata, postice impressa, in medio margine lobulo 

 rotundato prominulo instructa; ejus processus invicem remoti ex angulis lateralibus emergentibus, 

 terefces, ad inferum valde arcuato-decurvi, apice obtusi. Lamina infra-genitalis subtus carinata, dimidia 

 parte apicali fissa ; ramis compressis, contiguis vel basi leviter remotis, in tertia parte basali gracilibus, 

 subcylindricis, dehinc dilatatis ; eorum ampliatione margine infero arcuato, superne rotundato-angulata, 

 apice hebetato, haud acuto. Cerci dimidiam laminam infra-genitalem superantes. 



2 . Long. 14 ; pronot. 3 ; elytr. 20 ; femor. post. 10 ; ovipos. 2-3 millim. 



c? . Long. 12 ; pronot. 3 ; elytr. 10 ; femor. post. 9*5 millim. 



Hab. Mexico, Chilpancingo in Guerrero, Atoyac in Vera Cruz, Teapa in Tabasco 

 (H. H. Smith) ; Guatemala, San Geronimo, Zapote (Champion) ; Panama, Bugaba 

 (Champion). 



This species seems to be allied to P. tener, Stal, from Brazil ; but the latter 

 apparently does not possess curved appendages to the supra-anal plate. 



5. Thysdrus infirmus, sp. n. (Tab. XIX. figg. 30-32.) 



$ . T. meoneano simillimus. Elytra apice reticulata ; campo marginali venulis transversis 12-15 ; campus 

 ulnaris venulis transversis nuraerosissimis. Femora antica superne nonnunquam unispinosa. OviDositor 

 minimus, parum areuatus, quam cerci brevior. 



5 . Long. 13 ; pronot. 3 ; elytr. 18 ; femor. post. 10 ; ovipos. 1-5 millim. 



Figtjkes : — Fig. 30, the female insect, magnified. — Fig. 31, the end of the abdomen, with its small ovipositor. 

 — Fig. 32, the right elytron of the female. 



