A new species of Pilactium from Oregon 
(Coleoptera: Pselaphidae) 
A.A. Grigarick and R.O. Schuster 
University of California, Davis, 95616 
The genus Pilactium Grigarick and Schuster, 1970 was created for the 
single species, summersi, which was found in several localities in the 
mountains of northern California. The following is a description of a 
second species, collected in the mountains of southwest Oregon. 
Pilactium henedictae, new species 
(Figs. 1-3) 
Male. — (holotype slide-mounted). Head 236/i long, 280p wide; vertexal foveae 101^ 
between centers. Ventral surface of head with numerous capitate setae arising on 
tubercules; gular foveae 54^ apart. Eyes moderate, about 8 facets across. Antenna 426^ 
long; segment I 52p long x 41^ wide; II 46p x 38p; lll-VI 87^ x 29p; VII 25p x 33p; VIII 41fj x 26p; 
IX 29 x 44^; X 30^ x 51 p; XI 94^ x 62^, with normal acuminate and large tubular setae. 
Pronotum 209/i long, 313p wide. Elytron 413p long, 265p wide; with 1 sutural, antebasal 
and subhumeral foveae. Brachypterous. Protrochanter with short, blunt median spine; 
profemur 265p long x 84^ wide, 25-30 specialized setae on center one-half of segment; 
mesofemur 210^ x 75^; metafemur 295p x 69^. Mesocoxal cavities open. Specialized setae 
behind metacoxae. 
First visible tergite 192p long, 310p wide at base, with numerous specialized setae 207^ 
across center between basolateral foveae (fig. 3); II 136p long; III 130p long; IV 88^ long. 
Sternite II with numerous specialized setae along entire basal margin; basolateral foveae 
present. Sternites II, III with longitudinal row of specialized setae on apical one-half of 
segment about 73^ from lateral margins; VI with circular group of specialized setae on 
median apical margin (fig. 2). Penial plate 100p long x 87p wide. Genitalia 196^ long x 100^ 
wide (fig. 1). 
Male paratype (point-mounted). Red-brown. Length 1.34 mm, width 0.43 mm. 
Female unknown. 
Distribution. — The male holotype and two male paratypes were collected at Soda 
Mountain Road SE of Ashland, Jackson County, Oregon on X-15-72 by Ellen M. Benedict. 
Pilactium benedictae differs from P. summersi by the setate area of 
the first visible tergite being much wider, the setate area of sternite VI 
more compact and closer to the apical margin, and by the 
longitudinal row of specialized setae laterally on sternites II and III. 
Genitalic differences are also present. 
Literature Cited 
Grigarick, A.A. and R.O. Schuster. 1970. A new genus in the tribe Euplectini. Pan-Pacific 
Entomol. 46:36-39. 
The Pan-Pacific Entomologist 54:9-10. January 1978 
