158 PROCEEDINGS OF THE ACADEMY OF [Feb., 



1.2 mm.(c^)-1.4 mm. (9); length of autemioe 2.2 mm.($)-2.8 

 mm. (c?); length of anal legs 2.2 mm.( 9 )-2.8 mm. (d). 



Habitat. — Shasta Springs, Cal. 



Etymology. — The Sastians or Shastans were a tribe of Indians for- 

 merly holding the country about Mt. Shasta, the locality in which 

 the specimens were collected. 



8. Lithobius mesechinus sp. nov. 



Description. — Testaceous-brown, the legs and antennre yellow, head 

 and dorsal plates smooth or scarcely roughened, glabrous: ventral 

 plates sparsely pilose, the posterior ones more densely so; legs very 

 sparsely pilose; antennae with the ultimate articles sparsely provided 

 with stiff hairs, elsewhere very nearly glabrous. Head wider than 

 long (7:6.25). Antennae: articles 19-21, short, the ultimate shorter 

 than the 2 preceding taken together. Ocelli on each side : 13, arranged 

 in 3 series (1 +5, 4, 3), pale, Prosternal teeth 2-2, pale, small. Spines 

 of the first legs 1, 3, 1; spines of penult 1, 3, 3, 1-1, 3, 3, 2; anal legs 

 with the claw unarmed, spines 1, 3, 2, 0; last 2 coxse armed laterally 

 toward dorsum and also dorsally ; the. median ventral spines of legs 

 conspicuously longer than the others. Gonopods of ? : claw tripar- 

 tite, basal spines 2-2, acute. 



Length of body 9-10 mm.; width of 8th dorsal plate 1.5 mm.: 

 length of antennae 2-3.5 mm,; length of anal legs 3.5 mm. 



Habitat. — ^Meacham, Oreg. 



Etymology. — Greek' iJ.t<yo^^ middle, and l/.v.<(>^^ a hedgehog, spiny 

 object, etc., so named in reference to the long median ventral spines 

 of the legs. 



9. Lithobius castellopes sp. nov. 



Description. — Brown, legs and antennae paler, yellowish; head and 

 dorsal plates smooth; head sparsely pilose with moderately long hairs; 

 dorsal plates very sparsely pilose, more especially the posterior ones, 

 particularly about the margins; ventral plates, prosternum and prehen- 

 sorial feet sparsely pilose, the genital segment nearly glabrous below : 

 legs sparsely pilose ; antenna subdensely clothed with rather long stiff 

 hairs. Head nearly equal in length and width. Antennae : articles 20, 

 mostly short, the ultimate equal to or a httie longer than the two pre- 

 ceding taken together. Ocelli on each side : 12, in 3 series (1 +5, 4, 2). 

 Prosternal teeth 2-2, small. Spines of the first legs 1, 3, 2-2, 3, 2; 

 penult legs having the claw armed with 2 accessory spines or claws. 



