DYNASTIN^; 161 



distinct, rather sharply sinuate at the middle; prothorax subparallel, 

 the sides rounding and converging well before the middle; basal 

 angles moderately rounded; base feebly lobed medially, completely 

 immarginate; apical angles sharp and prominent; punctures fine 

 but strong, sparse, notably coarse and rather close toward the sides; 

 scutellum ogival, rather closely punctate, with wide smooth margins; 

 elytra fully one-half longer than wide, more than three times as long as 

 the prothorax and, at the middle, but little wider, circularly rounded at 

 tip; punctures not very fine but shallow, moderately close, arranged 

 for the greater part in rather close-set unimpressed series; hind tarsi 

 rather more than three-fourths as long as the tibiae. Length ( 9 ) 

 1 1. o-i 1.4 mm.; width 5.4-5.7 mm. Mexico (Tepehuane?, Durango), 

 Wickham *regularis n. sp. 



Pygidium in both sexes densely but finely scabriculate; prothorax less 

 transverse, three-fifths to two-thirds wider than long 3 



3 Hind body elongate, always much more than one-half longer than wide. 

 Body nearly as in the preceding but a little stouter, especially in the 

 female, the coloration nearly similar; head more or less than half as 

 wide as the prothorax, black, variably punctate, the eyes (cf) 

 separated by only a little less than twice their width; clypeus 

 usually dark rufous, trapezoidal, nearly as in the preceding but with 

 the obtuse angles generally not at all sharply defined and usually 

 somewhat rounded; antennal club (cf ) small, three times as long as 

 wide and much shorter than the stem, only a little smaller in the 

 female; prothorax with the sides feebly converging to before the 

 middle, then, gradually rounded and more convergent to the apex; 

 basal margin without trace of beading, the feeble median lobe 

 somewhat truncate medially; punctures as in regular-is but relatively 

 less coarse laterad; scutellum similar but more obtuse; elytra similar 

 but relatively distinctly broader and with the otherwise similar 

 punctures smaller, or at least feebler and less well defined, generally 

 denser and more confused postero-externally; hind tarsi (cf ) three- 

 fourths, or ( 9 ) barely more than two-thirds, as long a? the tibiae. 

 Length (cf 9) 11.8-15.0 mm.; width 5.9-7.8 mm. Mexico (Jalapa 

 and Durango), Arizona and in the southern parts of California. 

 Abundant and varying greatly in size. [ Cyclocephala dimidiata 

 Burm.] dimidiata Burm. 



Hind body much more abbreviated, distinctly less than one-half longer 

 than wide. Body colored similarly throughout; head (cf) similar 

 but with the eyes separated by distinctly more than twice their 

 width; clypeus similar and with the truncate apex strongly and 

 gradually reflexed, but with the sculpture of the basal parts still 

 coarser and shallower, confusedly rugulose; prothorax similar, but 

 with the punctures everywhere stronger; scutellum sharply ogival, 

 strongly, closely punctate, with the usual abrupt smooth margins; 

 elytra medially about a third wider than the prothorax, more broadly 

 rounded at apex, the punctures similarly disposed but much larger, 

 deeper and conspicuous, finer and more confused postero-Iaterad; 

 pygidium convex and, as usual, glabrous, finely, densely scabriculate, 

 T. L. Casey, Mem. Col. VI, Oct. 1915. 



