THE CANADIAN ENTOMOLOGIST. 71 



feet exposed for entire length ; caudal margin truncate, sides weakly bowed 

 outward from end to end, the anterior margin rounded on each side, 

 mesally incised. Frontal plate not discrete. Prebasal plate absent. 

 Basal plate greatly abbreviated, the exposed portion eight times as wide 

 as long. 



Antennae filiform, as compared with body length rather long ; articles 

 moderately long, decreasing distad, the ultimate a little longer than the 

 two preceding together ; bristles very long, distad, becoming shorter and 

 denser as usual. 



Claws of prehensorial feet when closed attaining distal end of first 

 antennal article ; claw armed at base with an acute conical tooth, prefemur 

 with a low, conical and subdentiform protrusion on mesal surface, other 

 joints unarmed. Prosternum wider than long in ratio 20:17 ; longer than 

 the prefemur in the ratio 17:10, nearly; chilinous lines distinct. Dorsal 

 plates bisulcate ; also with a weak median sulcus. All présenta short. 

 All spiracles circular, the first larger than the second. First pair of legs 

 shorter and much more slender than the second ; anterior pairs shorter 

 and thicker than those of posterior portion of body. Last ventral plate 

 moderately wide, narrowed caudad, the margins nearly straight, the caudal 

 slightly excised. Coxopleural pores four, small, two of these covered or 

 partly covered by the edge of the last ventral plate and the other two free. 

 Anal legs longer and thicker than the penult, ending in a long slender 

 claw. Pairs of legs in female, 37. 



Length, 6.5 mm. 



Locality. — Marshalltown, Iowa. 



The type, as with the preceding species, is a single female which was 

 taken — her eggs were very few in number. 



Explanation of Plaie. 

 Soniphilus enibinj, gen. et sp. no v. 

 Fig. I. — Dorsal view of anterior portion. 

 Fig. 2. — Ventral view of anterior portion. 



Fig. 3. — Labrum, ventral aspect. (The teeth of median portion 

 normally extend directly ventrad ; the figure shows them extending caudo- 

 venirad, this resulting from depression by the cover-glass). 

 Fig. 4. — Ventral view of posterior portion. 

 Fig. 5. — Ninth and tenth ventral plates. 



