314 Bulletin American Museum of Natural History [Vol. XLIII 



The foregoing description is based upon a specimen which was 

 taken at Medje, September 1, 1910, by the American Museum Congo 

 Expedition, supplemented by three males and two females in the collec- 

 tion of the Carnegie Museum from Cameroon, and three males and two 

 females in the Holland Collection from the valley of the Ogove River. 

 Some years ago I took a number of African Geometrida^ with me to 

 Europe for study and while at Tring I marked this species as agreeing 

 best with the genus named Osteosema ])y Warren. At that time it did 

 not appear to be represented in either the British Museum or the col- 

 lection of Lord Rothschild. It is possible that it has since then been 

 described by some author, but, after having devoted many hours to the 

 perusal of everything which has been printed, I am inclined to think 

 that I am justified in regarding the insect as hitherto nondescript. 

 Unfortunately we have no figures of multitudes of species named in 

 recent years, and the descriptions which have been given are, in many 

 cases, very unsatisfactory. The type, which is a male, is in The American 

 Museum of Natural History, the paratypes are in the Holland Collection 

 and the general collection in the Carnegie Museum. 



Geometrinae 

 PsEUDOTERPNA Hubuer 



(671) 1. Pseudoterpna ruginaria (Guenee) 



Hrjpochroma ruginaria Guenee, 1857, Phal., I, p. 278. 

 Pseudoterpna ruginaria Hampson, 1895, Moths of India, III, p. 472. 



One specimen caught at Medje, August 9, 1910. 



(672) 2. Pseudoterpna (?) chapinaria, new species 



Plate XIII, Figure 19, d" 

 cT'. Antennae slightly pectinated; the hind tibia dilated, with two pairs of 

 spurs, one at the end, another a little distal to the middle; eyes brown; body pale 

 gray; first segment of abdomen whitish; legs concolorous; fore wings on the upper 

 side pale gray; a narrow, somewhat diffuse outwardly curved subbasa) line; a faint 

 dark linear mark at the end of the cell, losing itself in the transverse median diffuse 

 dark band which runs from the costa to vein 2, where it curves abruptly inward, and 

 then is extended vertically to the inner margin about its middle. This band is suc- 

 ceeded by a postmedian band, which runs from the costa in a curved line to vein 2, 

 where it descends to the inner margin verticall}', parallel to the lower extremity of the 

 median line. The postmedian line is succeeded near the apex by a dark, somewhat 

 diffuse, crenulate subapical line, which runs from the costa to vein 5, where it coalesces 

 with the postmedian line. The margin is marked by a very fine dark line; the fringes 

 are dark gray, checkered with pale gray at the ends of the nervules. The hind wings 

 are colored like the fore wings; the subbasal line of the fore wing is continued on the 

 hind wing as a short waved line, reaching the inner margin before the middle. There 



