SPIDERS OF THE FAMILY ATTIDAE FROM AMES 231 



three millimetres in lengtli is in the collection. This has been 

 reported by the Peckhams and Comstock as having- been col- 

 lected only in the southern states. 



NEON Simon 1876. 



These are very small spiders. The ocular quadrangle oc- 

 cupies more than one-half the length of the eephalothorax. The 

 cephalothorax is moderately high and flat, sloping very sharply 

 just liack of the posterior eyes. 



Neo'ii nelli Peckham 1888. 



There are two females measuring three millimeters in length 

 in the collection. The cephalothorax with the ocular quadrangle 

 darkest. The abdomen is browTi and has lighter spots and faiut 

 chevrons on the posterior half. The legs are light with dark 

 brown rings. 



SYNEMOSYNA Hentz 1832. 



This is one of three genera of antlike spiders which occur in 

 our fauna. There is but a single representative of this genus in 

 the United States. The cephalothorax is long and narrow, 

 tapering at the posterior end. There is a very sharp con- 

 striction just behind the posterior eyes. The ocular quad- 

 rangle occupies about one-third of the cephalothorax. The 

 abdomen is long and narrow with a, deep, dorsal depression about 

 midway along its length. 



Synemosyna formica Hentz. 



A single female measuring eight millimetres in length is in 

 the collection. It was collected by Prof. C. P. Gillette and 

 identified by Banks in 1891. The cephalothorax is brown with 

 black markings at the sides, and a few wiiiie hairs in tiie region 

 of the eyes. The anterior median eyes are fully three times as 

 large as the anterior lateral eyes. The abdomen is brown, and 

 has a white stripe which extends do^^^lward, just behind the 

 dorsal depression and unites in a white spot on the ventral side. 

 The first pair of legs is light with a brown stripe extending their 

 length above and below. The second pair is all light and the 

 third pair is light except the femur which is brown. The fourth 

 pair has the femur and tibia brown, the rest all liglit. 



This species is distrilnited throughout the United States. It 

 lives on plants and runs like an ant. The mimicry is so per- 

 fect that it is often mistaken for an ant. 



The following table will show the distribution, throughout the 

 United States of the Attidge in the Ames collection. The eastern 



