Tlieridium maxillaie. now 



3 mm. long. Ceiihalolliorax and legs pale yellow, the abdomen 

 whiter than in the other species of Tlieridium. The cephalothorax 

 lias three narrow longitudinal black lines. The abdomen has a wide 

 white stripe in the middle, deeply notched at the sides and not, as in 

 most sj)ecies, narrowed toward the front. The white area is broken by 

 translucent lines following in the middle the line of the dorsal circu- 

 lating vessel. The crenate edge of this area is marked by a dark line 

 made up of black spots of irregular size which extend down the sides 

 of the abdomen with one larger spot to each lobe of the middle stripe. 

 The legs are faintly ringed with brown at the end of each joint and 

 in the middle of tibia and metatarsus. The sternum is pale in the 

 middle and brown behind and at the sides. The labium is also brown. 

 The base of the maxillae extends sidewise as a blunt tooth under the 

 coxa of the first leg. The palpal organ has the basal j)rocess large 

 and sickle-shaped, with a sharp point extending outward and for- 

 ward nearly to the end of the palpus. The tube crosses obliquely 

 under the basal process and is supported at the end by a short but 

 complicated appendage. Figs, i & i c. PI. I. 



One male only from low bushes in the large sphagnum bog at 

 Southwest Harbor, Mt. Desert, Me., July i, 1909. 



Theridiuin cinereiini. new 



This species is represented by one male only from Wellesley, Mass. 

 It resembles in size and proportions T. murarinm. As in that species, 

 the front legs are moderately long, not as long as in montanum and 

 sexpimdahun. The markings are different from the other species. 

 The cephalothorax is pale, with a small dark marking in the middle, 

 widened toward tlie front but not extending as far as the eyes. At 

 the sides the ceplialothorax is edged with dark. The abdomen 

 is dark gray with the middle band broken into four pairs of whitish 

 curved marks, almost separated from each other. On the under side 

 the sternum is pale, without markings, and the abdomen is pale, 

 with graj' spots around the spinnerets and the lung openings. The 

 legs are pale, without rings or spots, and only slightly darker toward 

 the tips and toward the ends of the joints. The male palpi are short 



