NOVITATES ZOOLOGICAE XXIV. 1917. 375 



Underside reddish, clouded mth grey in proximal half or sometimes more 

 or less throughout (especially on hindwing), otherwise with grey irroration ; 

 costal margin of forewiug rather hghter, with rather strong irroration ; both 

 wings with rather sharp black discal lunula and vague grey subterminal cloud- 

 ings, corresponding to the reddish ones of upper.side ; terminal dots very weak 

 or almost obsolete. 



Calama, Rio Madeira, below Rio Machados, August — October 1907 ('W. 

 Hoffmanns). 7 cJ<J in coll. Tring Museum. 



The genitaha have been examined by my kind friend the Rev. C. R. N. 

 Burrows, to whom I dedicate the species, and show a great difference from the 

 following species in the form of the gnathos, the shorter, hairy uncus, and 

 especially in the penis ; the manica is strongly spined, the vesica without the 

 characteristic cornuti of piercei. 



2. Ergavia piercei spec. nov. 



(J, 45-48 mm. Very similar to the preceding, distinguished as follows : ' 



Foreiving more unifonnly shaded with reddish, at least in the median area, 

 and as minute strigulac on the principal veins ; costal patches scarcely notice- 

 able, the basal sometimes wanting ; costal spots equidistant or even with the 

 median nearer to the antemedian ; in well-marked specimens an additional line 

 indicated (at least posteriorly) about 2 mm. proximal to the postmedian ; ter- 

 minal dots smaller. Hindiving with the double line just beyond cell much 



weaker, greyish or reddish, never mixed with black, the outer not expanding 

 into spots between the radials ; postmedian slightly more distally placed, with 

 minute dots (never long teeth or wedges) on the veins and nearly always with 

 a deeper sinus inward between the radials. 



Underside on an average paler than in hurrowsi, with postmedian Une well 

 indicated ; cell-mark of forewing sometimes shortened, that of hindwing gener- 

 ally wanting. 



Calama, Rio Madeira, below Rio Machados, August — October 1907, 15 <J<J, 

 including the type ; AlUanca, below San Antonio, Rio Madeira, November — 

 December 1907, 7 $S ; all in coll. Tring Museum, collected by W. Hoffmanns. 



Dedicated to Mr. F. N. Pierce, to whom also I am deeply indebted for help 

 in the investigation of Geometrid genitaha. 



Vesica with seven strong, broad cornuti. It is right to mention that the 

 specimen dissected was from Allianca, but there is no difference between the 

 series from the two locaKties named. 



3. Ergavia endoeasta spec nov. 



cJ, 48 mm. Closely similar to the two preceding, especially to piercei, of 

 which I should have supposed it a subspecies but that the antennal teeth are 

 longer, nearly cquaUing the diameter of the shaft. 



Forewing rather duller, very confusedly marked, the double postmedian, 

 however, indicated by ill-defined spots rather than dots ; cell-mark thin ; pale 

 subterminal line fairly distinct ; termen with short black lunules in place of 



the dots. Hindwing more weakly marked than in the allies ; terminal lunules 



as on forewing. 



