A NEW GENUS OF DERBID/E FROM BORNEO 



By Frederick Muir 

 (Hawaiian Sugar Planters' Association, Honolulu, Hawaii) 



ONE TEXT FIGURE 



jf^-.. 



Genus MONOCHORHYNCHUS novum 



Head narrower than thorax; vertex quadrate, w^idth of base 

 greater than length, apex about half of base, base obtuse-angu- 

 larly emarginate, carinse along base and sides fading out tov^ard 

 apex, basal area depressed, rising to apex, elevation at base of face 

 making apex look angular; face narrow^, lateral carinse nearly 

 touching in middle, basal half with lateral carinse small and a 

 fine median suture except at base 

 where face is subtumid, apical half 

 of face with deep lateral carinse; 

 clypeus much longer than face, 

 strongly tricarinate ; rostrum as long 

 as clypeus, reaching to beyond the 

 middle of abdomen, last segment 

 short, greatly enlarged at apex so that 

 it forms a suckerlike pad; eyes reni- 

 form, not reaching beyond the middle 

 of the face; antennse about half the 

 length of face, terete, second joint 

 slightly diminishing at base, flagellum 

 at apex. Pronotum deeply and an- 

 gularly emarginate on hind margin; 

 mesonotum longer than broad, later- 

 al angles behind middle, tricarinate, 

 the lateral carinse being sutures with 

 fine carinse on the outer edge. Teg- 

 mina with six median sectors, the third furcate; cubitus with 

 two veins with the first median sector approximate; clavus 

 small, open. 



The tegmen in this genus is similar to that in Paraprontista, 

 to which genus it is related, but the vertex, the face, and the 

 apical joint of rostrum easily distinguish the two genera. 



Type, Monochorhynchus wahri Muir. 



217 



Fig. 1. Monochorhynchus wahri g. et 

 sp. nov., o, face, front view ; b, 

 vertex and pronotum, dorsal view ; 

 c, genitalia, lateral view ; d, ros- 

 trum, lateral view. 



