NORTH AMERICAN GEOTRUPINAE — HOWDEN 283 



is slightly more obtuse than in profundus (pi. 2, jBg. 4c). Setae of 

 ventral portions similar, but appearing not quite as dense as on 

 profundus. Tibiae and femora of holotype apparently similar to those 

 of profundus, as are the genitalia and genital capsule. Angle at 

 center of posterior portion of complex right dorsal paramere more 

 V-shaped than in profundus (pi. 2, fig. 5c). 



Allotype: Female. Length 18 mm., greatest width 12.5 mm. 



Color of dorsum similar to that of holotype except that there is 

 slightly more iridescent green suffusing the purple elytral margin 

 near the apices. Except for the male modifications of the apical 

 tooth of the foretibia and hind femur, which the female lacks, the 

 allotype is very similar to the holotype. The lateral pronotal margin 

 is slightly less evenly arcuate than in the holotype, but in other respects 

 there is almost no difference. 



Holotype, male, Welaka, Fla., Apr. 29, 1949, van Pelt (UnMich). 

 Allotype, female, Welaka, Fla., Mar. 4, 1940, at light "(T-35)," Friauf 

 (UnMich). Paratypes, 10 males, 2 females: 1 male, Florida; 3 males, 

 Welaka, Fla., Apr. 29, 1949, van Pelt; 1 female, Welaka, Fla., Feb. 

 18-20, 1947, Moore; 6 males, 1 female, St. Augustine, Fla. Paratypes 

 are in the collections of the University of Michigan, U. S. National 

 Museum (USNM 61968), Carnegie Museum, and of the writer. 



Variation in the few specimens at hand is moderate. Size ranges 

 from 16 to 21 mm. in length and from 11 to 13.5 mm. in width. Sexual 

 variation other than that mentioned for the tibia and femur is slight. 

 The tubercle at the base of the foremargin of the pronotum is not 

 clearly evident in a few of the specimens, particularly the females, and 

 the anterior angle of the pronotum shows some variation, as does the 

 amount of purple iridescence. Due to the variation of some of the 

 characteristics, the small series, and its close similarity to profundus, 

 I have attempted to point out the apparent differences without giving 

 specific status to a population, which, with additional data and speci- 

 mens, may prove distinct. 



Distinguishing characteristics are the few thoracic punctures, the 

 sharp triangular tubercle projecting posteriorly from the inner edge 

 of the anterior margin of the pronotum, the purplish iridescence, 

 and the usually evenly arcuate lateral pronotal margin which in 

 profundus is usually distinctly bent near the middle. 



In differentiating this form all characters should be considered, as 

 no single character will consistently differentiate duhius from pro- 

 fundus. 



The specimens from St. Augustine, Fla., are included here as para- 

 types because of their similarity to the Welaka specimens, but several 

 differences in the populations can be noted. Two of these differences 

 are the interrupted second elytral stria, which is broken at intervals 



