48 PROCEEDINGS OF THE ACADEMY OF [Jan., 



Genus CEROYS Serville." 

 1S39. Ceroijs Serville, Orthopteres, p. 262. 



Inchided perfoliatus Gray and multispiiiosus Serville, of which the 

 former may be considered the type. 

 Ceroys bigibbus n. sp. 



Type.— 9 ; Nicaragua. [Cat. Xo. 6,973, U. S. N. M.] 



Apparently closer related to C. rabdota Westwood than to any other 

 species of the genus. From this it may be separated by the spinose 

 mesonotum, the comparatively shorter limbs, the absence of any very 

 marked appendages to the basal abdominal segments, and the very 

 different character of the apical segments of the abdomen. 



Size medium; form rather elongate; surface rugulose, lobate and 

 spinulose. Head longitudinal; occiput with a pair of prominent ear- 

 like processes, the extreme posterior margin with a pair of blunt spini- 

 form processes; eyes subspherical, moderately prominent; antennse 

 about equal in length to the pronotum and mesonotum, basal joint 

 strongly depressed. Pronotum slightly longitudinal, saddle-shaped; 

 surface strongly tuberculate, a distinct paired series extending on either 

 side of the faint median longitudinal sulcus; anterior margin with a 

 pair of medium size, rounded tubercles; posterior margin with a pair 

 of very jDrominent spinous processes. Mesonotum about four times 

 the length of the pronotum, somewhat constricted anteriorly, slightly 

 expanded centrally ; median portion with a pair of low transverse carini- 

 form lobes; posterior margin with two small pairs of median rounded 

 lobes; lateral borders with a row of low rounded fold-like tubercles. 

 Metanotum (with median segment) two-fifths the length of the meso- 

 notum, immediately anterior to the median segment two low rourded 

 lobes are developed; median segment very small, not one-fifth the 

 length of the whole segment ; supra-coxal region of the metathoracic 

 segment margined by a saw-like series of rounded lobules. Abdomen 

 slightly exceeding the thorax in length, the six basal segments all trans- 

 verse or subtransverse, each segment with the posterior margin with 

 two median pairs of lobules; sixth dorsal segment depressed, laterally 

 supplied with rounded foliaceous expansions; seventh and eighth seg- 

 ments somewhat compressed, subcarinate, the posterior margins irregu- 

 larly sinuate and serrate ; ninth segment strongly depressed posteriorly, 

 tuberculate, apex with the median portion sinuate; supra-anal plate 

 produced, convex, apex narrowly rounded ; subgenital opercule reaching 

 slightly beyond the apex of the supra-anal plate, longitudinally striate, 



' Stal's Caulonia {Recensio OrthojAerorum , III, p. 74, 1875) is apparently 

 nothing more than a synonym of Serville's genus. 



