6 
THE PAN-PACIFIC ENTOMOLOGIST 
additional paratypes as follows: California, Death Valley, Inyo Co. [sic.], Saratoga Springs 
VI-12-1964, Fred G. Andrews (3); California, Death Valley, V-27/29-1955 Belkin et al., (57); 
California, Inyo Co., Tecopa VI-17-54, Belkin and McD. (1); California, Inyo Co., Tecopa VII- 
11-1953 (1). (Paratypes in USNM, LACM, CAS, Howden, Hardy.) 
Diagnosis: Polyphylla erratica, because of the tridentate anterior 
tibia, would key to couplet two in Fall’s key. Species which also have 
this tridentate characteristic are P. hammondi, cavifrons, squamiven- 
tris, and anteronivea. P. hammondi has shorter antennal club (1.5 to 2 
times length of basal segments, erratica usually greater than 2 times 
[Fig. 14]), less pronounced clypeal angles, both white and yellow pro- 
thoracic scales ( erratica has white only), testaceous (as opposed to 
white) ventral hairs, and usually at least some hairs on clypeus and 
thoracic disc behind anterior margin ( erratica has hairs confined to 
front and anterior prothoracic margin). P. cavifrons lacks the clypeal 
angles, has an anteriorly expanded clypeal shape (quadrate in erra¬ 
tica) a smaller antennal club (less than twice length of basal seg¬ 
ments) and fine hair-like scales (oval in erratica). P. squamiventris has a 
short antennal club (shorter than cavifrons), and an unimpressed 
maxillary palp (small concave area in erratica). P. erratica is evidently 
most closely related to the preceding species. P. anteronivea has 
slightly less well developed clypeal angles, an apically broadened 
clypeus (quadrate in erratica), less elongate and apically less pointed 
scales, and an anterior elytral impression which results in a trans¬ 
verse carina from the scutellum towards the humeral area. Addition¬ 
ally, anteronivea lacks any trace of a pattern or vittae in the posterior 
half of the elytra ( erratica usually displays at least some evidence of 
fragmented vittae posteriorly). 
Remarks: Some specimens from Saratoga Springs were taken at 
dusk flying low over Distichlis grass in the salt encrusted bottom of 
the Amargosa River. These specimens were not attracted to black- 
light after dark. 
Polyphylla pottsorum Hardy, new species 
(Figs. 7, 8,13) 
Holotype male: Length 20 mm, width 7 mm. Integument of head, prothorax, scutellum 
piceous; elytra, antennal club, ventral body surfaces pale testaceous; pygidium, basal 
segments of antennae, legs testaceous. Clypeus widened apically, anterior margin reflex¬ 
ed, nearly linear, angles sharp, not produced above anterior margin (Fig. 13). Clypeus, 
front with elongate, pointed white scales, intermixed with semierect gray hairs. Pro- 
thoracic disc with few erect hairs close to anterior margin; with elongate white scales 
closely to densely over surface; scales intermixed with recumbent white scale-like hairs 
medially; Prothorax appearing faintly trivittate (Fig. 8). Elytra sparsely covered with small, 
elongate, pointed white scales, faintly vittate at elytral base. Pygidium sparsely scaled. 
Antennal club approximately 2 (linear) to 2.5 times (along curve) length of basal segments 
(Fig. 13). Ventral abdominal segments glabrous basally near suture, densely scaled api¬ 
cally; covered with sparse to dense, long, fine pubesence. Ventral surface of thorax den- 
