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(Figs. 2-4): 1 slightly bowed medioapically, apical margin with small median 
excision, 2 with apical margin round greatly expanded, covering sterna 3, 
4; 3 with apical margin concave, 4 with apical margin slightly angulate, 5 
with apical margin slightly incurved, sternum 6 bilobed with median tufted 
swelling (Fig. 3), 7 elongate with truncate apical margin; terga 1-5 not 
toothed laterally, tergum 6 with small lateral tooth on apical margin, slightly 
notched medially; tergum 7 bilobed, space between lateral teeth greater than 
width of lobe (Fig. 1), (one lobe broken off of type); apical part of genitalia 
as in Fig. 2; length 7 mm; anterior wing 4.5 mm long. 
Female. —As in male except usual sexual differences and clypeus mostly 
impunctate, margin produced beyond base of mandible, lateral apical margin 
angulate, truncate medially, corners round, width of truncation equal to 
distance between antennal scrobes, with depressed subapical pit row, base 
of clypeus bulbous in side view; frons below median ocellus flat in side 
view; terga 1-3 red, 4 only laterally; length 6-7 mm; anterior wing 4.5-5 
mm long. 
Variation. —The paratype male is more extensively red marked, with only 
median black spots on terga 2-6. Also, the clypeus on this specimen is less 
punctured (Fig. 6). Females have the same variable red pattern and some 
have fewer pits on the clypeus. 
Types. —Holotype male; ARIZONA: 8 km (5 mi) N Kingman, Mojave 
Co., Ill-12-72 (P. Torchio, B. Apperson). Paratypes; 2 males. Walker Pass, 
Kern Co., Calif. VI-11-62; 6.25 km (10 mi) N Searchlight, Clark Co., Ne¬ 
vada, IV-21-66 (Torchio, Rust, Youssef) Malacothrix. Seven females; AR¬ 
IZONA: 2.5 km (4 mi) W Chloride, Mojave Co., IV-28-72 (P. Torchio, G. 
Bohart, F. Parker), Oatman, Mojave Co., Ill-13-72 (P. Torchio, B. Apper¬ 
son). NEVADA: Montgomery Pass, White Mts., VI-27-52 (S. Tirgari), VI- 
22-62 (G. Bohart) Mentzelia\ Alamo, IV-28-73 (F. Parker, P. Torchio). Ho¬ 
lotype deposited in the collection at the U.S. National Museum, No. 76201. 
Paratypes in the collection of the Bee Biology and Systematics Laboratory 
at Logan, Utah. 
Range. —Desert areas of So. California, Nevada, and Arizona. 
Systematics. —The male of P. torchioi resembles P. lindsdalei (Michener) 
as both species have the long bilobed tergum 7. However, differences in 
sternal characters readily distinguish them, as stated in the following key. 
The females of P. torchioi resemble those of P. mojavensis (Michener), as 
both species have a shiny, mostly impunctate clypeus. The depressed sub- 
apical pit row and the flat supra antennal area of P. torchioi distinguish it 
from P. mojavensis. The enlarged sternum 2 of male P. torchioi is unique 
among species of Hoplitina. The formation of sterna 2 and 7 closely resem¬ 
bles that found in subgenera with hooked hairs on their mouthparts, such 
as Acrosmia and Penteriades. Perhaps the presence or absence of hooked 
hairs on the mouthparts is an unnatural means of separating subgenera in 
