MORTH amf:rican I'll ai-angiid.t-:. 267 



August and Sejiteinber. It sometimes oceurs under boards in fields, 

 and is often swept from grass and low herbage. Tlie bodies of the 

 New Hanipr^liire forms are smaller than those from Ohio, although 

 there is little difference in the length of the legs. 



MITOI»lJS Thorell, 1876. 



This genus is eliaracterized as follows: A strong tooth on the ven- 

 tral surface of the first joint of the mandibles. Maxillary lobes of 

 second pair of legs forming elongated triangles, which are quite 

 large at base, then gradually retracted, not impressed, with anteiior 

 border straight. The palpal claw is not denticulate. The body 

 teguments are soft or sub-coriaceous, and the anterior border of the 

 cephalothorax in our species is provided at the middle with three 

 small geminated |)oiirts. The dorsal surface is provided usually with 

 small teeth, which, on the abdomen, are arranged in transverse series. 

 The eye eminence is of medium size, about as wide as long, lightly 

 canaliculate, and provided wnth two series of low tubercles. 



1 formerly called this genus OUgolophnx, and have explained rea- 

 sons for the change in the " American Xaturalist," vol. xxvi, p. 528. 

 Two American species have been described, only one of which has 

 been found in New Hampshire. 



illifopiis pieliiN (Wood I Weed. 



Phalangium pictitm Wood, Comm. Essex Inst. vol. vi, pp. 30-31. 



Oligolophui! jrictHs (Wood) Weed, Amer. Nat. vol. xxi, p. 35. 



Oligolophus pictus (Wood). Weed. Bull. 111. St. Lab. N. H. vol. iii, \)\). 9r,-97. 



Mitopus pictns (Wood). Weed, Amer. Nat vol. xxvi. p. 528. 

 Male. — Body 5 mm. lono;, 3.2 mm. wide; palpi, 4.1 mm. long. Legs: first, 11 

 mm.; second, 27 mm.; third, 13 mm.; fourth, 20 mm. Dorsum minutely .scab- 

 rous, mottled ash-gray, much lighter in some specimens than otliers. Daik cen- 

 tral marking generally very distinct, commencing at the anterior border of the 

 cephalotliorax, the dorsal surface of which it almost covers, and suddenly con- 

 tracting at its posterior margin, .so tiiat it starts on the abdomen as a narrow 

 line, slightly wider than the eye eminence, then gradually expanding until it 

 reaches the end of the anterior third of the abdomen, where it suddenly contracts, 

 its borders irregularly curving towards the dorso-meson, then expanding again, 

 though not becoming as wide as before, and finally gradually contracting and 

 running as a stripe to the last segment, oi-. as in some S|)ecimens, simply termi- 

 nating at the anterior margin of the i)enultimate segment, .\nterior margin of 

 cephalothorax nearly straight, lateral angles slightly jiroduced. each having a 

 black si)ine on an elevated base; three large l)rownisii black, tooth-like jirocesses 

 just back of the middle of the margin, eai-h terminating with a minute spine, 

 the middle process being slightly in front nf the others. Back of these, but in 

 front of the eye eminence, there is a ciirved series of minute spines on whitish 

 elevated bases, and back of the eye eminence, on tiie cephalothorax, there are 



TR.\NS. AM. ENT. SOC. XIX. NOVEMBER, 1892. 



