96 
Psyche 
[Sept. 
second segment also expanded, one short, incurved spur 
on the anterior tibiae and the first segment of the anterior 
tarsi padded almost to the base. The male of normalis 
differs from it in having unexpanded palpi and in having 
the pad confined to the apical third of the first anterior 
tarsal segment but is like it in having a single anterior 
tibial spur. The male of bispinosa has two slender spurs 
on the anterior tibiae as in the females of all three, has un- 
expanded palpi and the pad of the first anterior tarsal 
segment as in maculata. This combination of characters 
in the males is exactly like that of the female of any of the 
three species and it is only by the genitalia that the male 
can be distinguished from the females at all. 
Length : 9 to 12 mm. Black, quite densely clothed with 
pale olive-cinereous to cinereous pubescence, with scat- 
tered denuded spots as in maculata (Say). Indistin- 
guishable from maculata and normalis in shape, propor- 
tions and sculpture of head and pronotum. Antennae 
almost identical with those of maculata , which vary 
slightly in different sized specimens. 
Holotype : c? 10 mi. E. of Sonoita, Sta. Cruz Co., Ari- 
zona, alt. 4800 ft., in grassland, Aug. 1, 1948. F. Werner, 
E. & W. Nutting. Feeding on leaves of Chamcesaracha 
coronopus (Dunal) A. Cray. (M.C.Z. No. 28219) 
Allotype: ? eutopotypical (M.C.Z.) 
Paratypes: 62JV?, 9?? eutopotypical, in U.S.N.M., 
Chicago Nat. Hist. Mus., U. Kansas., Cal. Acad., collec- 
tions of F. H. Parker, C. P. Mackenzie and F. Werner. 
In an area less than one hundred miles square in south- 
eastern Arizona there occur no less than four distinct, 
apparently very closely related species in the maculata 
group ( maculata , normalis, bispinosa and nogales ). One 
would expect that if these species were interfertile a fair 
number of hybrid forms would occur. There has been no 
attempt made to cross one with another experimentally 
but so far no morphological evidence of hybridization has 
come under observation. It is within the realm of pos- 
sibility that hybrids do occur, at least among the first 
three species, since there is no difference in habitus, all 
varying greatly in the size and number of denuded spots 
