110 Annals of the Carnegie Museum. 



Genus Otumba Morse. 



Otmnba Morse, Biol. Centr.-Am., Orthopt., II, 1900, 7. — Hancock, Genera In- 

 sectorum, fasc. 48, 1906, 43. 



The genus Otumba belongs to tropical America and is composed of a 

 number of species, only a few of which have thus far been characterized. 

 The following table will assist in their determination: 



Synopsis of the Species of Otumba. 

 A. Pronotum not provided with accessory abbreviated carinae between the 



shoulders. 

 b. Posterior angles of the lateral lobes of the pronotum rectangulate, not at all 

 acute; humero-apical carinae very strongly expressed, leaving a deep groove 



between them and the lateral carinae scapidaris Morse. 



bb. Posterior angles of the lateral lobes of the pronotum acute. 



c. Lateral lobes having the posterior angles little dentate, produced outwards, 

 lightly angularly excavate behind; humero-apical carinae of dorsum 

 enclosing narrow grooves; vertex nearly quadrate; face below the eyes 

 and lower part of lateral lobes of pronotum light yellow. 



dentala Hancock. 

 cc. Lateral lobes with the posterior angles acute produced; median carina of 

 the vertex strongly produced; superior carina of the hind femora irregu- 

 larly undulate spinifrons Stal. 



A A. Pronotum bearing accessory abbreviated carinae on each side between the 



shoulders. 



b. Dorsum with the abbreviated and humero-apical carinae between the shoulders 



moderately distinct; tegmina fuscous, with or without a large j^ellow 



oblique macula on the posterior half; posterior angles of the lateral lobes 



rectangulate acute. 



c. Tegmina immaculate; the supplemental carinae on the disk of the pronotum 



short, with a second pair likewise short, forming the apices of decussate 



lines thus: X peruviana Bruner. 



cc. Tegmina flavo-maculate; the supplemental carinae on the disk of the pro- 

 notum arcuate, of moderate length lobala Hancock. 



bb. Dorsum with the abbreviated humero-apical carinae between the shoulders 



strongly expressed; posterior angles of the lateral lobes of the pronotum 



flattened, subobtuse angulate. 



c. Dorsum of the pronotum opposite the apex of the tegmina profoundly 



depressed; the disk beyond without the supplemental longitudinal 



carinae; tegmina brownish testaceous basalts sp. nov. 



cc. Dorsum of the pronotum opposite the apex of the temgina gently depressed; 

 the disk beyond provided on each side with prominent longitudinal 

 carinae; tegmina grayish, streaked below with fuscous. 



marcapala Hancock. 



