200 PROC. ENT. SOC. WASH., VOL. 22, NO. 8, NOV., 1920 



The most reliable character in distinguishing the instars is the 

 size of the head. Other characters, such as color and the pres- 

 ence of certain lines aid in their determination but are not so 

 reliable. With some practice the instar can be told by the naked 

 eye. There is no constant ratio between the sizes of the heads 

 during the different instars, as stated by Dyar for other moths. 



The growth in length or width during a*caterpillar's life, is not 

 constant and when plotted forms an oscillating line. In general, 

 the growth is negative during the last few days of each instar. 



The larvae first feed gregariously upon the surface of the oak 

 leaves and later separate to feed upon the full thickness of the 

 leaves. Newly hatched and older caterpillars will migrate con- 

 siderable distances in search of food. Due to climate and natural 

 enemies their number fluctuates in each locality from one extreme 

 to the other. 



NEW SPECIES OF NEOTROPICAL PYRAUSTINAE (LEPID.). 



BY W. SCHAUS. 



(Continued from page IQO.) 



Bocchoris cubanalis, new species. 



Female. Palpi ochreous fringed with white. Head ochreous with a white 

 spot on frons and one on vertex behind. Collar brown in front, white be- 

 hind. Thorax brown with lateral white lines. Abdomen above brown, 

 the basal segment suffused with white; a broad lateral white band on basal 

 half. Wings white, the markings mostly ochreous brown; a terminal fus- 

 cous line inwardly edged with white, interrupted on fore wings by veins; 

 basal half of cilia ochreous, terminal half grayish white. Fore wings: costal 

 margin gray; some ochreous shading at base; a subbasal outbent streak 

 below cell ; antemedial line almost vertical mottled with black striae ; a 

 medial spot across cell edged with black striae ; a similar -broad bar on disco- 

 cellular; postmedial from edge of costa, almost vertical to vein 2, upangled 

 and curved where suffusing with discocellular bar, then vertical and slightly 

 sinuous to inner margin; a broad subterminal shade expanding at vein 2 

 and suffusing with postmedial; a streak along vein 7 expanding to subter- 

 minal shade, leaving small white spots on either side of postmedial line 

 below costal margin.' Hind wings: postmedial line heavily striated with 

 black, downbent to near anal angle, upbent and narrower to lower angle 

 of cell, then curved to inner margin below middle; the subterminal shade 

 broadly edged inwardly with black striae and suffusing with postmedial at 

 anal angle. Wings below white with all the markings as above fuscous gray. 



Expanse, 15 mm. 



Habita'. Santiago, Cuba. 



Type. Cat. No. 237X1, U. S. N. M. 



Allied to B. minima von Hedemann. 



