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NOVITATES ZOOLOGICAE 



Vol. XXIII. SEPTEMBER 1916. No. 2. 



NEW NEOTROPICAL GEOMETRIDAE. 



By LOUIS B. PROUT, F.E.S. 



Subfamily OENOCHROMINAE 



1. Dolichoneura foveata sp. no v. 



(J, 31-32 mm. Closely similar to convergens Warr., differing chiefly in its 

 much smaller size and in structure. Antennal ciliation rather shorter (about as 

 long as diameter of shaft). 



Forewing with M approaching SC at a good distance from base, to make room 

 for a large, elongate fovea which extends to the base of M 2 ; rather less pure white 

 than convergens, the proximal snbmarginal shade thickened, thus closely approaching 



or in places almost confluent with the distal one. Hindwing with R 1 and R 2 



arising very near together and curving so as to approach even more closely in the 

 middle of their course ; distinctions from convergens in colour and markings as on 

 forewing. 



Underside much less pore white than in convergens. 



Aroewarwa Creek, Maroewym Valley, Surinam, July, 1905 (S. M. Klages), type 

 in coll. Tring Mus. ; St. Jean de Maroni, French Guiana, August, paratype in coll. 

 L. B. Prout. 



An interesting link between Warren's Dolichoneura and Pycnoneura, which are 

 scarcely separable generically. 



2. Pycnoneura monops sp. nov. 



cJ, 37 mm. Head with palpus and scaled surface of antenna blackish brown. 

 Thorax, abdomen, and legs concolorons with wings, only the foreleg in part 

 darkened. 



Forewing with apex moderately sharp, termen almost straight, only behind M 2 

 very faintly subconcave ; SC 1 from cell*; drab, with sparse, inconspicuous dark 

 irroration ; lines fine ; antemedian extremely faint, sinuous, from nearly one-third 

 costa to one-third hindmargin ; postmedian better expressed, from before two-thirds 

 costa, oblique to R 1 , with a slight tooth outward at SC 5 , strongly toothed at R 1 , 

 thence lnnulate-dentate, with slight proximal curves between the radials and behind 

 M 2 ; discal dot large (1 mm. in diameter), black ; an extremely faint, crenulate 

 whitish subterminal line ; termen with the usual black dots before and behind 

 SC 5 , the rest of the series very minute to obsolete ; terminal line slightly and fringe 



* Exceedingly few examples in this genus (always difficult to obtain) were known to me when I 

 prepared my revision for Gen. Ins. , fasc. 104. I am now able to say that in the species which passes for 

 oxypteraria Guen (unfortunately described from a ? ) and in its close ally turpi» Warr., as also in 

 rectilineata Warr., SC is always well stalked, in cinerea Butl. usually very shortly stalked, in ablataria 

 Guen. (which is perhaps more of a Dolichoneura) always from the oell. 

 11 151 



