Abstract
In the present paper the author dealt with the morphological characters of larvae of four species belonging to the genus Calothysanis HUBNER (Geometridae, Sterrhinae), C. amata, C. comptaria, C. dichela, and C. apicirosea. The nomenclature for the setae is coincided with that of HINTON (1946). A seta "lambda" of FRACKER (1915), commonly found in the larvae of Geometridae on A1 to A7, referred to as "seta LD", used by SIGHN (1951) in his figures. These larvae have the combination of characters. Body form strongly enlarged at posterior half of T3 and A1. Body setae extremely short, but on A1 slightly longer, especially setae L2, LD and V1. Subventral setal group on A1 unisetose, bisetose on A2 and trisetose on A3 to A5. Prolegs of mature larva bear up to 31 biordinal crotchets incompletely separated into two groups. Seta CD2 of anal proleg distinctly above level of seta L3. Seta SD1 on A1 distinctly posterior to L2. Seta D1 on anal shield slightly posterior to L3. Based on larval characters, SIGHN (1951) divided the subfamily Sterrhinae into two distinct divisions, "A" and "B". This genus belongs to "Division A" by the above-mentioned characters. Probably "Division A" may be correspond with the tribe Cosymbinii, including this genus.
