On Ileterocera from Costa Rica. 577 



In loot (Trans. Zool. Soc. xvii. pt. 3) I arranged the 

 p^enera in live snljtannlics ; tliesc may be gronpcd as 

 i'oUows : — 



I. Pharyng-eals toothless ; lifonial spines not bifid ; supra-cleithral 



plate fxteudiiif? downwards, it.s inner surface attached to the 

 outer edjro of tlie cleithruni, but not furniin|j: a definite articulatidn 

 with it ; body usually armoured ; inner cdjre of luetapterygoid 

 attached to lateral ethmoid ; hypocorncoids interlocking. 



I'lvcDstom iiicc, llijpoptopomafince. 



II. Lower and fourth upper pharyngeals touthed ; anterior h;emal 



spines bitid for reception of anal basalia : supra-cleithral plate 

 scarcely decurved, its lower surface with a transverse ridge fitting 

 a groove on the upper edge of the supra-cleithral expansion 

 external to the head of the bone. 

 Body annoured ; nietapterygoid attached to 

 lateral ethmoid ; lower portions of cleithra 

 transverse ; hypocoracoids interlocking 



below LoricariincB, Neopleco- 



stomince. 

 Body naked ; metapterygoid small, not reaching 

 skull ; cleithra running somewhat forward 

 to their symphysis ; hypocoracoids taper- 

 ing forward below, not interlocking .... Argiince. 



It seems to me that if the Argiidre are to be separated off 

 as a distinct family, the Plecostomidac also should be recog- 

 nized, as they differ quite as much from the LoricariidcC. 



LXVI. — Neio Species of Htterocera from Costa Rica. — XI. 

 By W. SCHAUS, F.Z.S. 



Geometridae. 

 Aplogompha argentilinea, sp. n. 



^ . Palpi and frons lilacine buff; vertc x, collar, and thorax 

 dull lilacino brown ; abdomen dark brown above, silvery 

 grey below. Fore wings : the basal liaif: to middle of costa 

 and j.ostmedial line on inner margin black-brown^ crossed by 

 some buff strife, and containing a ^qw metallic scales in cell 

 outwardly, followed by a large triangular whitish spaca 

 shaded with fuscous scales and with its apex at vein 2, its 

 costal area shaded with buff; a postmedial dark reddish- 

 brown line, followed by fine buff and dark brown lines, and 

 a heavy silvery line outwardly shaded with black and not 

 reaching costa ; a dull buff-grey space beyond the silver line 

 limited by a straight subterminal white line, beyond which 



