NORTH AMERICAN GEOTRUPINAE — HOWDEN 259 



Length 10 to 16 mm., greatest width 6 to 10 mm. 



Color of dorsum black suffused with vague purple, blue, or green 

 iridescence which is obscure at times but noticeable along elytral 

 margins and in lateral striae. Ventral surfaces black. Antennal 

 club light reddish brown with middle lamella not emarginate. Eye 

 can thus, vertex, and clypeus, except for small median area just be- 

 fore tubercle, coarsely, densely, irregularly punctate. Three tubercles 

 on head very vague, as is the indented line at the clypeal base. Cly- 

 peus margined, slightly more arcuate anteriorly. Eye canthi vaguely 

 margined, rather sharply bent anteriorly, sides almost parallel; 

 angle with clypeus very obtuse. Pronotum completely margined, 

 moderately convex, with numerous coarse punctures most numerous 

 laterally and along indented posterior portion of midline. Vague 

 median circular depression usually present on the sides of the pro- 

 notum. Minute secondary punctures almost always lacking. Scu- 

 teUum triangular with a longitudinal median depression and sides 

 rather evenly arcuate. Elytra with well developed striae having 

 numerous irregularly spaced and shaped punctures. The sutural 

 stria extends around the scutellum reaching the elytral base. The 

 second stria does not quite reach the elytral base. Elytral margin 

 narrow, wider anteriorly. 



There is no distinguishing external sexual modification between 

 male and female, Foretibiae, which are identical in both sexes, 

 have the dorsal longitudinal raised carina extending along the inner 

 edge of the outer flattened surface. The carina has a pronounced 

 extension onto the penultimate external tooth (pi. 2, fig, 14) and a 

 row of adjacent setae basally, which are separated by small trans- 

 verse carinae. External face of tibia of meso- and metathoracic legs 

 each with two complete transverse carinae and two or three partial 

 carinae. Tarsal claws similar in both sexes. 



Genital capsule and genitalia of male weU developed with the 

 parameres almost hidden by the large phallobase. Both parameres 

 lacking long setae at tips (pi, 3, figs. 10, 11), 



Variation in size, punctures, and color is moderate. There is no 

 evident external difference between male and female specimens; 

 however, female specimens appear to be generally slightly larger 

 than males. 



The species may be distinguished by the lack of external sexual 

 differences, dorsal black color slightly suffused with purple, blue, or 

 green iridescence, sutural stria extending around scutellum to elytral 

 base, second stria not reaching base, only two complete external 

 transverse carinae on tibiae of meso- and metathoracic legs, tips 

 of parameres of male genitalia lacking long setae. 



