THE CANADIAN ENTOMOLOGIST. 



very stout teeth, which extend directly ventrad (ihe figure accompanying 

 suggests a bedding of these teeth somewhat caudad, which does not 

 exist) ; of these teeth the two median are clearly largest, the others de- 

 creasing from median to outermost ; lateral portions with edge bearing a 

 few spinous processes much more weakly chitinized than the teeth of mid- 

 dle portion. (See pi. i, fig. 3.) Mandibles with a single pectinate lamella ; 

 no dentate lamella. Both branches of first maxillae set off by a suture; 

 the outer branch biarticulate, entirely without lappets or with a single 

 short, conical one on outer edge of base ; coxae completely fused at mesal 

 line. Coxi^ of second maxillae fused at middle ; palpi short, bearing a 

 simple claw of normal size. 



Chitinous lines of prosternum strongly developed. Prehensorial feet 

 \vith joints all unarmed ; claws when closed not attaining front margin of 

 head. Frontal plate not discrete. Prebasal plate absent. At least the 

 anterior sterna with caudal margin strongly chitinized in a sharp edge or 

 blade-like form, which fils into a transverse groove in anterior margin of 

 succeeding plate. (See fig. 5.) Pores not detected. Dorsal plates 

 bisulcate. Last ventral plates very wide. Anal legs six-jointed, ending 

 in claws. 



Type. — Soniphiliis enibius, sp. nov. 



Soniphihis secimdus Chamb., a Californian species, also belongs here. 



Soniphiliis embiiis, sp. nov. 



Slender, attenuated cephalad and caudad ; body very sparsely 

 provided with short straight hairs, the head with longer ones. 



Yellowish-white, the anterior region more strongly yellow or lemon 

 colored ; head with prosternum and prehensorial feet pale reddish brown ; 

 antenna? yellowish white. 



Head widest over caudal portion, the sides from middle caudad but 

 very slightly converging, the sides in front of middle nearly straight and 

 clearly converging ; anterior margin with middle part straight, transverse, 

 on each side a little oblique, extending a little caudad in running from 

 middle to lateral cornea, straight. Frontal suture absent. Prebasal plate 

 absent. Basal plate four times as wide as its median length, a little wider 

 than cephalic plate (24:23). Antennae filiform, of moderate length ; articles 

 longer than wide, decreasing in length distad to the penult, the ultimate 

 about equal in length to the two preceding taken together. • 



Claws of prehensorial feet when closed not attaining the anterior 

 margin of head, short, the inner free margin of prefemur very short or 



