384 THE CANADIAN ENTOMOLOGIST. 



joined, and showing a marked tendency for two shorter articles to alternate 

 with one longer one. 



Ocellus on each side large, bluish, often showing a sliglu tendency 

 toward doubling. 



Prosternal teeth 3 + 3. 



Angles of ninth, eleventh and thirteenth dorsal plates produced. 



Coxal pores round, moderate in size ; 3, 3, 3-3, 4, 4, 4. 



Legs as usual ; tibial process well developed, apically spinescent in 

 anterior pairs ; all feet ending in three claws ; anal legs long and slender. 



Claw of goncpods long, entire ; basal spines 2 + 2. stout and conical. 



Lengthy 13 mm.; width, 2 mm.; length of antennae 6-6.5 ^^''^^"'• 



Locality.— Mill Valley, Cal. 



Ten specimens were secured under leaves and sticks in a very damp, 

 shaded locality such as preferred by the other species of the genus. 



This, the third species of the genus to be made known, is very close 

 to Z dolichopus Chamberlin, found originally in the AVahsatch Mts. at 

 elevations above 8,000 feet; but it is larger and more robust, and presents 

 constant differences in coloration and in some structural details. 



10. Btiethob'ncs coniiigaiis, sp. nov. 



Light orange in colour, the head and caudal segments darker, but the 

 head pale in front of frontal suture. Antennae and legs yellow, the caudal 

 pairs of the litter usually darker, orange, especially so proximally. 



Antennae short or moderate in length, being considerably variable, 

 composed of 43-45 articles, of which the first two, or more rarely three, 

 are largest, those immediately succeeding ihe second or third being very 

 short, the more distal ones becoming again longer ; the last two longer 

 than those immediately proximad of them. 



Ocelli none. 



Prosternal teeth 3 + 3, small, acute, in some darkened apically. 



Angles of none of the dorsal plates produced. 



Coxal pores 2, 2, 3, 2-3, 3, 3, 3, round. 



Ultim.ate coxae produced into an acute process at distal end, this 

 projecting caudad as in some Scolopenoridse. 



Tarsi mostly biarticulate, though often very indistinctly so in anterior 

 pairs, and in some the articulation difficult to detect in any of the first 

 thirteen pairs of legs. Each leg of the first fourteen pairs ending in three 

 claws, the anal legs each with but a single claw. 



