The differences between the palpi of the males are very plain. In atrica the palpi [(fig. 434)] are as long as the whole body, with the femur and tibia both slightly curved and the tarsus and palpal organ small and like that of x-notata. In x-notata [(fig. 435)] the palpus is as long as the cephalothorax, and the tarsus and palpal organ small and round. The front legs are a fourth longer than in atrica. In montana [(fig. 435a)] the palpus is still shorter, the tibia thicker, and the tarsus and palpal organ larger. There is little difference in the shape of the epigynum of the different species, but that of montana is twice as large as that of x-notata or atrica.

Singa pratensis.—The Singas are small Epeiridæ a sixth or fifth of an inch long, with smooth bodies and bright colors. They live among grass and other small plants in low open ground. When full grown the females of S. pratensis are a fifth of an inch long, with the abdomen oval and marked with a double white stripe in the middle and a single one on each side. The cephalothorax is yellow, with a little black between the middle eyes not extending to the lateral pairs. The legs are yellow, without rings or other markings. The abdomen is yellow brown, darker toward the hinder end, with white or light yellow stripes. The under side is the same yellow-brown color, darker in the middle, with two narrow, curved, light lines from the spiracles to the spinnerets. The males are marked in the same way and have a smaller abdomen and longer spines on the legs.

Singa variabilis.—This is a little smaller than pratensis, usually about a sixth of an inch long. The legs and cephalothorax are bright orange color. The front of the head between the eyes is black. The abdomen is usually entirely black, but occasionally has bright yellow markings [(fig. 436)] arranged somewhat as in pratensis. Sometimes there is a wide middle stripe, with narrower ones at the sides and two underneath. Sometimes there are only the two lateral stripes, and there are all variations between these markings. The males are colored in the same way and have the same varieties. They are smaller than the males of pratensis, but have the palpal organs as large or larger.