70 THE CANADIAN ENTOMOLOGIST. 



almost obliterated ; cbw within a very small conical tooth at base, other 

 articles unarmed. Prosternum with chitinous lines well developed ; two 

 submedian longitudinal sulci ; anterior margin unarmed, weakly angularly 

 depressed from sides to median line ; much wider than long (14:9), longer 

 than greatest length of prefemur nearly in ratio 9:5. Dorsum weakly 

 bisulcate. Présenta of middle region moderate or short, not much de- 

 creasing in length cephalad and caudad. Spiracles all circular, relatively 

 large, the first considerably larger than the second, the others gradually 

 decreasing from the second caudad. Legs of first pair decidedly shorter 

 and more slender than the second. Ventral pores not detected. Plates 

 of anterior pordon of body with a transverse groove along cephalic edge, 

 which is protected by a flange-like extension on the ventral side ; into this 

 groove fits the well-chitinized, extended blade-like caudal edge of the pre- 

 ceding plate in each case. Last ventral plate very wide, strongly narrowed 

 caudad, the lateral margins a little incised below middle ; caudal margin 

 straight. Coxo-pleuiœ each with a single free isolated pore of small size, 

 and two larger pits covered by the edge of the plate. (See fig,. 4.) 

 Anal legs longer and slightly stouter than the penult (female). Pairs of 

 legs (female) 43. 



Length, 13 mm. 



Localities. — DeWitt, Iowa. 



The type is a single female, which was taken with her recently-laid 

 egg>. 



Genus Poaphilus, gen. nov. 



Agreeing in general with Soniphilus, as described above, but readily 

 distinguished in having the joints of the prehensorial feet dentate witliin 

 and its claws extending nmch beyond the front margin of the head. The 

 last ventral plate is narrow or but moderate in width, not very wide, as in 

 the preceding genus. 



Type. — Poaphilus kewinus^ sp. nov. 



Aside from the species here described, a second one from New 

 Mexico is also known. 



Poaphilus kewinus, sp. nov. 



Body very small, strongly attenuated cephalad and caudad. 



Antennae and legs pale yellow ; bady light yellowish brown ; head 

 with prosternum and prehensorial feet light reddish brown. 



Head much longer than wide (ri:8) ; ten or eleven times as long as 

 the very short basal plate ; relatively narrow, leaving sides of prehensorial 



