154 Annals Entomological Society of America [Vol. V, 
excavated above, the depression being continuous with a longitudinal 
median- furrow on dorsal surface. See Pl. XII, fig. 4. 
Length 13-14 mm.; width at tenth plate 1.9—-2.2 mm. 
Locality: Las Valles, New Mexico (Prof. T. D. A. Cockerell) 
The types consist of a male and a female. 
Poabius iginus sp. nov. 
Light brown, scuta mostly with the caudal borders darker, reddish 
brown; posterior segments darker. Head chestnut, darkest behind 
frontal suture, a dusky or blackish median longitudinal stripe for a short 
distance in front of caudal margin. Legs yellowish, caudal pair from 
base to fourth joint inclusive reddish brown or chestnut, distally like 
the others. Venter brown, the ultimate plates reddish brown. Pro- 
sternum light reddish brown. Antennz mostly dark brown, becoming 
pale distad. 
Scuta roughened, mostly showing a median and two lateral longi- 
tudinal sulci or in some the median replaced by two diverging sulci. 
Antenne moderate, articles 20. 
Ocelli distinct, ten in number, arranged in three series; thus, 
1-4 By 2: 
Prosternal teeth 242. 
Angles of none of the dorsal plates produced. 
Coxal pores small, well separated, round, 2, 3, 3 (4), 2. 
Last two pairs of coxe laterally armed. 
Tarsi of anterior pairs of legs rather indistinctly biarticulate. Spines 
of first legs 2, 3, 2; of penult 1, 3, 3, 2, armed with three claws; of the 
anal 1, 3, 2, 0, the claw single. 
Gonopods of female with the claw tripartite; basal spines 2+2, 
proximally clavate, distally conical. 
Anal legs of male with the fourth joint enlarged and bearing meso- 
dorsally and proximad of middle a conspicuous, flattened, keel-like 
lobe and at its distal end a small wart-like elevation. 
See Pl. XIII, fig. 2. 
Length 11.5 mm.; width 1.7 mm. Length of antenne 4 mm.; of 
anal legs 4.2 mm. 
Locality: Madison, Wash. (Dr. E. Bergroth). 
Closely allied to P. bilabiatus and P. verdescens; but mani- 
festly smaller and differing in the lobes of anal legs and in the 
smaller number of spines born dorsally at distal end of third 
joint, etes see Pl. XE hes, wand? 2, 
Family CRYPTOPID. 
Genus Kethops, gen. nov. 
Pairs of legs 23. 
Seventh segment not bearing spiracles. 
First dorsal plate with transverse semi-circular sulcus. 
Other dorsal plates excepting the ultimate with two sharply 1m- 
pressed longitudinal and subparallel sulci. 
