232 ORTHOPTERA. 



[2. Liphoplus krugii, sp. n. 



$ . Apterus, gracillimus ; capite, antennis, thorace, pedibus cercisque rufis ; abdomine nigro ; corpore toto 

 albido-squamoso. Caput superne depressiusculum. Palporum articulus ultimus trigonalis. Pronotum 

 aeque longum ac latum, vel paulo longius, posterius minime dilafcatum, margine posteriore transverse Meso- 

 et metanotum rufa. Pedes pubescentes. Tibiae anticae in latere interno foramine minimo instructa3, non- 

 nunquam obliterate Femora postica breves, modice crassa. Tibiae et eorum calcaria illis L. mexicani 

 conformia. Metatarsus compressus, supra denticulis 6 : 8. Abdomen gracile ; lamina supra-analis trans- 

 versa. Cerci ingentes, longissimi ac crassi, verisimiliter quam corpus longiores, run. Lamina infra- 

 genitalis regulariter trigonalis. Ovipositor gracilis, leviter deflexus, valvis apicalibus breviter lanceolatis. 



Long. corp. 9 ; pronot. 2, latit. 1*8 ; fern. post. 5 ; tib. post. 3*5 ; ovipos. 4-3 millim. 



Hal. Antilles, Cuba (Dr. Krug, Muss. Berol. et Genavense 1). 



This insect may be the female of L. mexicanus. 



It has the same facies and coloration as Arachnocejjhalus yersini, Sss. ; but the frontal 

 swelling is less pronounced than in that species ; the last joint of the palpi is shorter 

 and less dilated ; the posterior tibiae are shorter, stouter, less straight, prismatic, not 

 cylindric ; the posterior metatarsus is longer, more compressed, more serrulate ; the 

 second joint of the tarsi is ndt cordiform ; the ovipositor is longer and more robust; and 

 the cerci are enormously large.] 



Tribus TRIGONIDINJE. 

 Trigonidiens, Saussure, Miss. Scient. Mex., Orthopt. p. 361 ; Mel. Orthopt. 6 e fasc. p. 598. 



The insects belonging to this group are of small size, and are very graceful and 

 exquisite musicians. The elytra have in both sexes the veins of the lateral field 

 longitudinal and simple. The mediastinal vein is not ramose, but in the males 

 widely separated from the humeral vein. 



In all the American genera the elytra of the males are peculiarly formed and 

 musical, the tambourine being very complete, extending over the entire elytra, even 

 when the latter remain more or less coriaceous, and presenting the following 

 characters (Tab. XIII. fig. 36) :— 



Only one oblique vein, quite longitudinal, curved, extending up to the stigma and 

 receiving in its middle an adventitious, longitudinal, sigmoidal vein, which starts from 

 the basal angle of the elytron. The axillary veins not anastomosing together before 

 the nodus analis. The vena? post-analis and post-aocillares straight or feebly curved. 

 The speculum elongated, rhomboidal, and presenting a concentric rhomboidal field of 

 the same form as the speculum, delineated by an adventitious nerve parallel to the 

 margins of the speculum. The vena involvens forming two narrow cells along the 

 hind margin of the speculum and contiguous in the middle. The apical field atrophied, 

 without nervures, and very narrow, membranaceous, and rounded. 



