672 PROCEEDINGS OF THE ACADEMY OF [Sept., 



PLAGIOTRIPTUS Karsch. 

 1889. Plagiotriphis Karsch, Entom. Nachr., XV, p. 8. 

 Type. — Plagiotriptus hippiscus (Gerstaecker). 



Plagiotriptus hippiscus (Gerstaecker). 



1873. Choroetypus hippiscus Gerstaecker, Von der Decken's Reisen in Ost- 

 Afrika, Bd. Ill, Abth. 2, p. 42, taf. 2, fig. 8. [Mombasa.] 



Mombasa, East Africa. [Hebard Coll.] One female. 



Section Erianthi. 



ERIANTHUS Stai. 



1876. Erianthus Stal, Ofversigt af K. Vetensk.-Akad. Forhandlingar, 1876, 

 No. 3, p. 55. 



Type. — According to Biirr^ Mastax guttata Westwood. 



Erianthus nipponensis n. sp. 



Type: $ ; Nikko, Hondo, Japan. [U. S. Nat. Mus., No. 8115.] 

 Belong to the group comprising E. guttatus Westwood, flavoinflatus 

 Brunner and acutipennis Saussure. From all of these it differs in having 

 the f astigium unreflexed ; from guttatus it also differs in the lower and 

 more obtuse fastigium; from flavoinflatus in the smaller size, obliquely 

 truncate apical portion of the tegmina, and non-dentate cephalic mar- 

 gin of the pronotum, and from acutipennis in the form of the tips of 

 the tegmina and the rotund ato-angulate caudal margin of the prono- 

 tum. Considerable affinity exists also with E. ohtusus Burr, but that 

 species has the fastigium obtuse. 



Size rather large; form elongate. Head with the occiput and vertex 

 sharply ascending, the fastigium elevated above the eyes a distance 

 equal to half the length of the latter, not re flexed, rectangulate, a 

 median carina present on both the dorsal and cephalic aspects; frontal 

 costa with the interantennal expansion elongate pyriform, the costal 

 carinse apparent almost to the clypeus ; antennae inserted slightly below 

 the middle of the eyes; eyes elongate ovate, moderately prominent. 

 Pronotum hardly selliform, slightly tectate, median carina distinct, 

 somewhat undulate; cephalic margin sinuato-truncate with a distinct 

 median emargination ; caudal margin obtuse-angulate with the angle 

 rounded; dorsal surface strongly rugose, transverse sulci not apparent; 

 lateral lobes slightly longer than the caudal depth, inferior margin 

 obliquely sinuate, cephalo-ventral angle broadly rounded, caudo-ven- 

 tral angle rectangulate. Tegmina reaching to the apex of the abdomen, 

 enlarged apically and obliquely truncate. Wings ample, as long as the 

 tegmina. Ovipositor valves with the teeth decidedly crassate and 



Anal. Soc. Espan. Hist. Nat., XXVIII, p. 103. 



