44 
PAN-PACIFIC ENTOMOLOGIST 
hairs are dense clinging creamy-white hairs. In males the sexual segment is 
bracketed by conspicuous tufts of many long, straight, black hairs. 
Head. —Large in males due to elongated occipito-temporal region. Eyes, 
slightly oval, bulging more in females than males. No frontal cord. Labrum, 
small and semicircular. Mandibles, large and stout, especially in males. 
Antennae, long in males, shorter in females, bristling with short blunt hairs. 
Thorax .—Pronotum, transverse, widest about the middle. Apical border 
straight in females, more sinuate in males. Apical angles are impressed, 
basal angles lost in the even curvature sweeping from the widest part around 
the base. Lateral borders are minutely serrulate. 
Legs .—Protibiae, somewhat wedge-shaped, with two slender distal spurs 
almost concealed by the long slender dark hairs on the anterior apical bor¬ 
der. Comparable hairs on the meso- and metatibiae are even more promi¬ 
nent. A few (3-8) dark, stout spinules are scattered on the outer posterior 
borders of the pro- and mesotibiae. Slender tarsal claws with a basal dilation 
and appendages as long as the claws. 
Elytra. —Slightly constricted and depressed behind the humeri, widest 
behind the middle. Epipleura are broad at base, narrowing abruptly, and 
disappearing at the bend of the elytra. 
Ventral abdomen. —A sixth sternum is visible in both sexes. In males, it 
is centrally impressed and bracketed with tufts of long black hairs. 
Fourteen specimens, bearing my numbers 1293 and 1314-1326, were col¬ 
lected by the author on flowers of Eriogonum east of Lake Elsinore, Riv¬ 
erside County, California, June 6, 1969. I am pleased to name this species 
after my wife who has been an invaluable assistant and constant companion 
on many happy collecting trips. 
Holotype .—Male, No. 1293, Allotype: female, No. 1319. Paratypes: 5 
males and 7 females with the same data. 
The holotype and allotype are designated for deposit in the California 
Academy of Sciences type collection of insects. Duplicates are designated 
for the collections in the Departments of Entomology of the University of 
California at Riverside and at Berkeley. 
Irwini and volki are similar in having bright testaceous color in part of the 
dorsal aspect, and in having similar epipleura—wide basally and tapering 
abruptly before the abdomen, then gradually to the end. Grandiceps and 
vandykei are similar in having the central bodies all dark (except for the 
terminal ventral abdominal sternum, possibly in females of vandykei) and 
in having similar epipleurae—wider basally, and tapering gradually to the 
end. 
Irwini, grandiceps and volki are striking species. Vandykei is more dif¬ 
ficult to identify as it lacks outstanding features possessed by the other 
three. Irwini has at least three prominent unique features: the pronounced 
frontal cord, the pale testaceous elytra with a dark triangular basal spot, 
