248 J. H. Euierton — Nevi England Attidm. 



of the alxlomon are dark and light l»ro\vii, and resemble those of 

 Saitis piilex and the female A. x>(diistris. There is a large light 

 mark across the middle of the abdomen, and behind it several light 

 angular marks. In colors and general appearance this resembles 

 Saitis pulex, and lives in the same places under stones and leaves. 

 Beverly and Middleton, Massachusetts. 



Synemosyna formica, Hentz 



This is the most common ant-like spider, and the most ant-like 

 among them. It is 0'"™ long, and the cephalothorax is 2'"'" long and 

 1""" wide. The cephalothorax is narrowed behind and the abdomen 

 in front and each has a deep depression near the middle. PI. XXI, 

 fig. 5. The pedicel of the abdomen is flat and widened behind, so 

 that it is nearly as wude as the ends of the thorax and abdomen which 

 it connects. The front middle eyes are large, and cover two-thirds 

 of the front of the head. The rest of the eyes are very small. The 

 legs are slender, their relative length 4, 3, 1, 2. The general color 

 is black, with yellowish white markings. There is a triangular white 

 spot in front of the dorsal groove, and one on each side widening 

 downward, under the posterior eyes. On the abdomen there is a 

 white stripe extending downward from the dorsal groove on each 

 side, and uniting in a large white patch on the front of the under 

 side of the abdomen. The second legs ai'e entirely white, the first 

 have a black stripe along the inner side, the third have the femur 

 black and a black spot at the base of the tibia, and the fourth have 

 the femur, the end of the patella and nearly all the tibia black, 

 and black spots on the front of the coxre and trochanter, and black 

 lines on the metatarsus. The palpi are white, sometimes with dark 

 spots on the sides of the joints. 



The front end of the abdomen has a hard piece on the under side 

 from the pedicel to the epigynum, which extends upward on each 

 side, so that the edges are visible from above. The epigynum has a 

 wide oval opening, in the front part of which ai'e two small openings 

 to the tubes. 



The males differ but little from the females in color and general 

 appearance. The head is higher and narrower, and the mandibles a 

 little longer, turned obliquely forward and curved apart in the 

 middle. Fig. 5c. The male palpi are large. The tibia is short 

 and has a very large hook. Fig. 5/". The palpal organ is large and 

 only half covered by the tarsus. The tube passes completely around 



