NORTH AMERICAN COLEOPTERA. 97 



segments of the abdomen darker than the other segments, the usual ten- 

 dency being to have these segments paler. 



While the female alone is known to me I have no hesitation in placing 

 it in the present series. 



Two specimens 9 • Arizona. 



15. C veiitrale n. sp.— Body beneath and abdomen piceous; head, thorax 

 and elytra rufo-testaceous, shining, sparsely pubescent. Antennae rufo-testaceous 

 shorter than the head and thorax, third joint longer than the second. Head oval, 

 sides behind the eyes feebly arcuate, nearly parallel, hind angles rounded, color 

 rufo-testaceous, sides rarely slightly darker, surface moderately coarsely and 

 closely punctate. Thorax narrower than the head, slightly narrower posteriorly, 

 about one-fourth longer than wide, median smooth space well defined, on each 

 side the punctuation coarse and deep, close in front, sparse posteriorly and near 

 the lateral margin. Elytra one-third wider than the thorax and a little longer, 

 the punctuation coarse and deep, rather closely and regularly placed. Abdomen 

 above very finely and sparsely punctate, beneath more distinctly punctate. Length 

 .44 inch ; 11 mm. 



Male ( Complete form). — Third ventral with a small punctiform fovea at centre; 

 fourth ventral with a small fovea at centre, the posterior margin prolonged in a 

 lobe with parallel sides and broad obtuse tip which extends to the middle of the 

 sixth segment; seventh segment entire (PI. 2, fig. 6). 



Male {Incomplete Jorm). — Third and fourth segments foveate as above, the lobe 

 of the fourth variable in length extending sometimes to the margin of the fifth 

 segment or gradually shorter, so as to be barely visible (PI. 2, figs. 7, 8). 



Male {Imperfect for m). — Fovese of the third and fourth ventrals very small, the 

 latter segment truncate without trape of lobe (PI. 2, fig. 9). 



Female. — Ventral segments without trace of fovese. 



The striking differences between this species and the two preceding, to 

 which it is most closely allied, have been already referred to in the notes 

 on these. A very large series has been examined from which I have 

 selected about thirty specimens for my cabinet more perfectly illustrating 

 the polymorphic tendencies of the male than in any other species. It 

 was the difficulty in attempting to assort the material according to what 

 seemed to be the accepted standard, which led me to prepare the remarks 

 on the sexual characters with which this paper is begun. 

 Collected in Arizona, near the southern boundary. 



Series B. 



The species here separated is characterized by the presence in the male 

 of the emargination of the seventh ventral together with the prolonged 

 lobe on the fourth. The form of the head on which Dr. LeConte laid 

 some additional stress seems more purely a specific character, as we have 

 the same foreshadowed in tumidum and several of the smaller species. 

 It is worthy of mention that the male has the third ventral simple, the 



TRANS. AMER. ENT. SOU. XII. (17) FEBRUARY, 1885. 



