Pomona College Jouhnal of Entomology 665 



Genus Soniphilus C'liaml)crlin 



This genus as at present known embraces two species, the one described 

 Ixlow and S. cmhiiis Chaniberlin, the ty|)e of tlie genus, a closely related species 

 from Iowa which is hut l.'i nun. long. In this geiuis the ))rehensorial feet are 

 short, not attaining the front margin of the head, and its joints arc all unarmed 

 within. The Hrst maxillie have hut one la])pet on each side, this being an out- 

 growth from tlie |)roximal article of the palj)us. The last ventral plate is very 

 wide. Co.xoiileural pores few and small, mostly covered by the edge of the ventral 

 plate. 



Soniphilus secundus sp. nov. 



Chitinous lines of prosternum not wholly complete. Claws of preliensorial 

 feet with .1 minute or obsolete denticle within, not attaining front margin of head. 

 Cephalic plate widest a little in front of caudal margin, narrowing moderately 

 forward. Frontal suture not jjresent. Basal plate very wide. Prebasal plate not 

 exposed. The labrum has two very stout conical teeth at middle, the adjacent 

 processes being abruptly less strongly chitinized and longer like those of lateral 

 fringes. Spiracles all circular, the first larger than the second. First legs a 

 little shorter ;ind more slender than the second. Last ventral plate very wide, 

 narrowed caudad. Two moderate sized pits on each coxopleura covered, or mostly 

 so, by edge of last ventral plate. Anal legs in female slender, longer than the 

 penult, ending in a well developed claw. The body is attenuated strongly caudad 

 and less strongly, though considerably, cephalad. Fulvous ; head light reddish 

 yellow ; antennas yellow. Length ad 1 8 nnn. Pairs of legs, in female forty-three, 

 male forty-one. 



Localities. — Sausalito (author, April, 1911), Pacific Grove (author, July, 

 1909). 



As indicated previously, this species is very close to the type species S. emhius 

 found in Iowa and Wisconsin; but it differs clearly in the character of the 

 armature of the labrum, in the shape of the cephalic plate, in the larger basal 

 plate and in details of the last ventral plate and the coxopleurffi. The chitinous 

 lines of the prosternum are also less strongly developed. 



Tabiphilus gen. nov. 



This genus is in general structure most clearly allied with the preceding; but 

 it differs in having the edge not twisted ventrad at the middle, the teeth extending 

 caudad as in most genera and not having the middle two quite so strongly 

 differentiated from the others, and clearly in having two long membranous lappets 

 on each of the first maxilla, the distal lappet being clearly longer than the distal 

 article of the palpus. The one species known is larger and has a much larger 

 number of pairs of legs than any one in the two other genera of the family. 



Tabiphilus rex sp. nov. 

 Body light ferruginous. Attenuated cephalad and more decidedly caudad. 

 The cephalic plate is truncate anteriorly and also posteriorly ; the sides are 

 straight and parallel from the caudal angles forward to about the beginning of 



