Cymindis (Iscariotes) kalabi sp. n. is described from the Halastandarya River basin, Kunlun Mt. Range, Xinjiang-Uygur Autonomous Region of China. New species similar to C. semenowi V.E. Jakovlev, 1889, jakowewi Semenov, 1889 and hyaloptera 1891 but differing all these taxa in shape head pronotum, structure male genitalia.

1. For the phototropic reaction of bees, the stimulating effects of two illuminated fields differing in intensity and area become equal when the product of area and intensity is the same for both fields. 2. The effect of two areas differing in size and flicker frequency is the same for the bee, when the product of area and flicker frequency is equal for both fields. 3. If two patterns of the sa...

Circularly repeating patches containing sawtooth luminance gradients produce a sensation of motion when viewed in the periphery. Illusory motion is perceived in a dark-to-light direction, but only when one's gaze is directed to different locations around the stimulus, a point outside the display is fixated and the observer blinks, or when the stimulus is sequentially displayed at different loca...