1974] 
Moore — New Species of Opiihes 
357 
long, slender, falcate, each with two large internal teeth, those of 
the left of nearly equal size, those of the right with the proximal 
tooth smallest. 
Thorax. — Pronotum four-fifths as long as head, a little less than 
half as wide as long, widest near the middle, rapidly constricted to 
the front where it is about twice as wide as neck, rounded at the 
middle and narrowed posteriorly for a short distance, then straight 
and nearly parallel to the narrowly rounded basal angles ; base 
straight, about one-fifth narrower than widest point; surface evenly 
convex, highly polished, impunctate on disc with large scattered 
umbilicate punctures along the base and for a short distance forward 
along each side. Superior lateral line short, about half the length of 
the pronotum, evanescent at each end. Prosternum longitudinally 
carinate with a few fine scattered setae. Lateral prosternal carina 
obliterated. Mesosternum narrow, not produced between the coxae. 
Metasternum long, broad, with an impressed longitudinal central 
line, very finely, very sparsely pubescent. Elytra hardly wider than 
head, conjointly almost one and one-half times as long as wide, 
humerus obtusely angulate with a minute tooth at the angle, sides 
nearly straight and nearly parallel, outer apical angles rounded, 
apices oblique, inner apical angles obtuse, sutures elevated, disc with 
six or seven irregular rows of crowded coarse punctures, interspaces 
shining. Legs very long and slender, anterior tarsus not dilated, 
without dense spatulate setae beneath. First segment of posterior 
tarsus longer than last segment, segments two, three and four de- 
creasing in length. 
Abdomen. — Parallel, finely, sparsely, punctured, the punctures set 
with fine black setae with a few scattered larger setae particularly 
along the posterior margin. Last two segments somewhat more 
densely punctured than the others. Apical margin of sixth tergite 
about one-third of distance on each side produced in a large blunt 
tooth, the margin between the teeth broadly evenly arcuately emargi- 
nate. Vestiture beneath similar to above. Apex of sixth sternite 
arcuate with a very slight emargination in the central eight. 
Length. — 12 mm. 
Sex unknown but probably a female because of the condition of 
the sixth sternite, other species in the male have a deep incision in 
the apex of that sclerite. 
Mexico, Sinaloa, Mazatlan, December 1966, R. H. Crandall, Jr., 
collector. 
Disposition of type. — California Academy of Sciences, San Fran- 
cisco. 
