82 
Psyche 
[June 
Dam o thus alastus new species 
Plate 5 
Holotype, male. Utah: Tooele County, Ophir, Oquirrh Mountains, 
2000 m. 25 April 1961. Herbert W. Levi, leg., in cottonwood, sage. 
Specimen preserved in the Myriapod Collection of the Museum of 
Comparative Zoology, Harvard University. 
General. Length: 11.5 mm. Pedal segments: 37, Body widest 
over posterior third, anterior to which it is gradually acuminate. Color : 
generally pale yellow ; the head and prehensors yellowish-orange. 
Antennae. Length: (expanded in Hoyer’s) 1.65 mm. Shape: strictly 
filiform, neither attenuate nor clavate. Setae gradually increasing in 
number and decreasing in length on articles 1-14. Ultimate article 
twice as long as penult ; its upper third with short, Hat, special sensory 
setae on outside and inside surfaces. Cephalic plate. Length: 0.416 
mm. Greatest width: 0.406 mm. Shape: sides evenly excurved; rear 
margin perfectly straight. Clothed with straight, relatively short, 
stiff setae. Frontal suture absent. Prebasal plate completely concealed. 
Clypeus. Paraclypeal sutures broadly membranous, complete. Trans- 
buccal sutures vague, passing only half-way to lateral margin. With 
a pair of small and extremely weakly consolidated areas (plagulae) 
on extreme posterior margin. Setae: postantennals, 1 + 1, very long; 
midclypeals, 2 + 2, the inner pair much longer than the outer pair ; 
prelabrals absent. Labrum. Midpiece very wide, armed over entire 
width with long, hyaline, thin serratures. Sidepieces: strongly- 
developed, well-sclerotized ; each with a few delicate, hyaline serra- 
tures; widely separated centrally; separated from clypeus by wide 
membranous strip. First maxillae. Coxosternum: without setae; 
medially undivided ; very vaguely separated from medial lobes and 
telopodites ; with a pair of concealed, relatively long lappets. Second 
maxillae. Isthmus very wide from side to side but narrow antero- 
posteriorly. Each coxosternite very weakly sclerotized, with few setae; 
without special thickenings or similar appurtenances. Telopodite: with 
strongly-developed dorsal and ventral basal condyles; the articles 
separated by distinct sutures ; outer marginal setae extremly short and 
robust; inner marginal setae much longer; apical claw long and thin, 
Explanation of Plate 5 
Damothus alastus sp.n. a. First and Second Maxillae. Left halves, all 
setae shown, b. Ultimate Pedal and Postpedal Segments. Ventral aspect, 
setae deleted, c. Left Sixth Leg, Tarsus and Pretarsus. Anterior surface, all 
setae shown, d. Tarsungula and Intercalary Articles of Left Prehensor. Ven- 
tral aspect, principal setae shown. 
