202 PAPERS BY DR. B. CLEMENS. 



F. w. with one or more areoles. Wings thin. Body slen- 

 der. Geometridse, 



Submedian and internal veins obsolete. 



Subcostal and median 3-branched ; with disco-central. Sexual 

 peculiarity among ? of Eu bolides. Geometridse, 



HlND WINGS WITH A COSTAL VEIN. 



1. With an intercostal cell. 

 f With an internal vein. 

 Median 3 or 4-branched. Subcostal bifid. 

 Lower branch of subcostal angulated ; costal furcate at base. 

 Antennae fusiform. F. w. with nervules radiating from the 

 disk. Zygsenidse, 



Lower branch not angulated ; costal simple at base. 

 Antennae fusiform, setigerous, sometimes ciliated. F. w. 

 with subcostal nervules aggregated. Sphingid33, 



f f Without an internal vein. 

 Median vein 3-branched. 

 Subcostal simple; discal vein with angle pointing outward, 



with a nervule. 



Subcostal bifid, discal vein curved, with disco-central. 

 Wings thin, delicate; h. w. angulated at apical nervule. F. 

 w. with two areoles. Geometridse, 



2. Without an intercostal cell. 

 IF Hind-wings without an internal vein. 

 Hind-wings with a tail-like appendage. 



Median 3-branched. Subcostal bifid. 



Disk closed, with disco-central. F. w. with costal vein 

 simple; subcosto-inferior simple. Sematuridse, 



Hind-wings without tail-like appendage. 

 Median 3-branched. Subcostal bifid. Costal and 



subcostal pendiculate. 

 Body slender. Wings thin. F. w. often with an areole. 



Geometridae, 

 IF IF Internal vein never very short or nearly 



coincident with the inner margin. 

 Antennce thickened or incrassated towards the tip. 

 Wings with transparent spots. Abdomen tufted at the tip. 



Thyridae, 



