481 



the proportion of Itngth to breadth of the face, but as this 

 varies with the length of the vertex, it is of no generic vahie. 

 The species in the collection of the Hawaiian Sugar Plant- 

 ers' Association, Honolulu, can be divided as follows : 



a. Apex of face truncate, no keel dividing the face from 

 clypeus : clypeus in profile in line with face or but slightly 

 angled. T. hrunnipennis: dryas: f estiva: saccJiarivorclla: neo- 

 gracilis; afrafa : nigrocacuminis; malayana; hntlcri: indica. 



b. Apex of face rounded, the lateral carinae continuing to 

 middle and forming a carina between face and clypeus : clypeus 

 in profile nearly at right angle to face. T. auihoiuensis ; sac- 

 charicola; neoelegans : neoaiuboinoisis: bagiiioeiisis: psciido- 

 bagiiioensis: fonnosana : signata. 



I have not seen flaviceps Stal, the type of the genus, so I 

 cannot say into which of the groups it will fall, and Stal's 

 description gives no indication. Fieber ^ in describing the genus 

 as based upon elegans Costa, says: "Front transversalement 

 convex audessus du clypeus," which would very well describe 

 the condition found in group B. If flaz'lceps belongs to group 

 A and elegans to group B, then it might be convenient to use 

 Costa's genus Nepliropsia. The type of Orchesma Mel., mar- 

 ginepunctaia Mel., comes into group A. Until these three types 

 have been compared and adequate distinctions pointed out, I 

 shall group them all under the one name. 



Tripidocephala butleri sp. n. 



Male. Maeropterous ; vertex three times the length of pronotuni, 

 carinae of vertex large, face slightly narrowed near base between eyes, 

 apex truncate, no carina dividing it from clypeus; carina across gena 

 obscure; clypeus rounded, tumid, without carinae; a distinct carina from 

 behind eye to tegula making the pronotum 5-carinate. 



Pygofer in profile entire, very shallowly emarginate on dorsal edge, 

 medio-ventral edge deeply and roundly emarginate with the corners 

 slightly produced and a small spine-like projection from the bottom 

 of the emargination; anal segment small, hind margin straight all round, 

 a single, strong, curved spine arising on right side near base and lying 

 along side the aedeagus; the latter is semitubular, thickest at base, 

 curved and slightly recurved at apex; genital styles similar to those of 



Eev. Mag. Zool. 1875 (3). Ill, p. 368. 



