378 Annals Entomological Society of America [Vol. XI, 



In the general character of the spining of the legs the new form almost 

 fully agrees with Sigihius occurring in the New England States ; but the 

 latter genus has the number of articles of the antennae twenty-five. 

 The body is slender and only slightly narrowed cephalad. First 

 tergite narrower than head and than the third tergite. 



Antennae short; articles twenty. 



Ocelli few, in two, or irregularly in three, series; the single ocellus 

 enlarged. 



Prosternal teeth 2 + 2, the line of apices distinctly recurved. Median 

 incision acute at bottom, V-shaped. 



None of the dorsal plates at all produced. The posterior comers of 

 the ninth, eleventh and thirteenth plates moderately oblique or excised. 



Coxal pores small, circular, few, uniserrate. 



Claw of female gonopods tripartite; lobes small, the lateral subequal. 

 Basal spines 2-f 2, moderately stout, though less so than in Tidahiiis, the 

 sides from base to apical division parallel, the apical acuminate part 

 very short. 



Coxffi of legs all wholly unarmed. Claws of anal and penult legs 

 two. Ventral spines of anal legs, 0, 1, 1, 1,0; dorsal, 0, 0, 2, 0, 0, (female) 

 or 0, 0, 1, 0, 0, (male). Ventral spines of penult legs, 0, 1, 1, 1, 0; dorsal, 

 0, 0, 1, 0, 0. 



Anal legs of male short, strongly and uniformly inflated; the penult 

 legs more moderately inflated, the tarsal joints slender; both pairs 

 wholly lacking special furrows or processes. 



Very small, the type species near 6 mm. (female) or less (male) in 

 length. 



Type. — Helemhius nannus sp. nov. 



Helembius nannus sp. nov. 



General color brown of slight chestnut tinge, the head more deeply 

 colored. Antennas paler, yellowish at tips. Legs yellow, but the poster- 

 ior pairs darker, excepting the tarsi, which are bright orange or yellow. 



Head much wider than long (about 34:25). Hairs sparse, of 

 moderate length. On caudal portion two sublongitudinal impressions 

 diverging cephalad. 



Antennaj very short; articles, excepting second and ultimate, very 

 short, the ultimate equalling the two preceding taken together. Hairs, 

 excepting the proximal articles, dense, of moderate length, setose. 



Ocelli in female type six or seven in number, thus, 1+2, 3 or 1+2, 

 3, 1. The single ocellus greatly exceeding the others in size, sub- 

 vertically elongate, and the ocelli of the upper series exceeding those 

 of the lower. 



Presternum 1.5 times wider than long. Distance between chitinous 

 spots near 3.57 times the dental line. Outer prosternal tooth on each 

 side extending farther forward than the mesal one, making the line of 

 the apices decidedly recurved. Sides slanting directly from the ectal 

 tooth, a little incurved. 



