266 ORTHOPTEBA. 



specimens it often becomes curved; its apex is very thin, styliform, and not dilated; 

 the inferior valvae are coarsely crenulated, the first tooth generally in the shape of a 

 small rounded lobe. The elytra of the males show two transverse veins, and have the 

 anal (stridulating) vein irregularly curved. (Comp. Diatrypus apitkoides, antea, p. 260.) 

 The genus extends from North America to Brazil, and is also represented in the 

 Antilles *. 



Synopsis specierum. 



I. 



a. Crassiusculi. Femora postica crassa. Verticis rostrum primo articulo antennarum 

 aequilatum. 

 b. Pronoti lobi laterales subquadrati, scilicet margine infero horizontal!, subrecto. 

 Elytra 5 simul sumpta supra ovata, venis longitudinalibus intricatis dense reti- 

 culata; vena mediastina 2-4-ramosa. Ultimus articulus palporum maxillarium 

 arcuatus, apice anterius dilatatus. 

 c. Elytra sensim complete explicata. 



d. Minor, ovipositor femori postico brevior. — 1. agitator, Uhl. 

 dd. Majores, graciliores. Ovipositor femori postico haud brevior. 



e. Ovipositor femori longior. Palpi apice arcuati. Tibiae posticae multi- 

 serratae. 

 /. Alae haud caudatae. — 2. aztecus, Sss. 

 //. Major. Alae leviter caudatae. — [3. nablista, sp. n.] 

 ee. Ovipositor femori aequilongus. Ultimus articulus palporum securiformis. — 

 [acutus, Sss. (Colombia).] 

 cc. Elytra abbreviata. Ovipositor femori brevior. — [4. brevipennis, sp. n.] 

 bb. Major. Lobi laterales pronoti antice margine infero arcuato, anterius ascendente, 

 angulo antico rotund ato. Elytra $ supra angustiora, polygonali-reticulata, 

 sectoribus obliquis obsoletis, irregularibus 4-5 ; vena mediastina 6-7-ramosa. 

 Alae leviter caudatae. Tympanum tibiarum anticarum minute ellipticum. Femora 

 postica modice crassa. Ultimus articulus palporum maxillarium oblique trigonalis. 

 — [annulicornis, Sss. (Surinam).] 

 aa. Gracilis, pedibus gracilibus, longioribus. Verticis rostrum angustum. Lobi laterales 

 pronoti anterius attenuati. Elytra $ supra venis longitudinalibus obliquis distinctis- 

 simis ; vena mediastina multiramosa. Ovipositor femori sensim aequilongus. Palpi ut 

 in sectione a, b. — 5. montanus, sp. n. 



II. 



1. Ovipositor quam femur posticum : 



a. longior. — 2. aztecus. — 3. nablista. 

 aa, haud longior : 



b. illo aequilongus. — 5. montanus. — [acutus.] 

 bb. quam illud brevior. — 1. agitator. — [4. brevipennis.'] — [annulicornis."] 



* The species from Brazil and Colombia (A. rolphi, A. acutus, and A. costalis, Sauss.) are larger than those 

 inhabiting Central America. Bolivar has described one species, A. irroratus, from Cuba (Ann. Soc. Ent. Ft. 

 1883). 



