68 MEMOIRS ON THE COLEOPTERA 



reversal in the sculpture. In discors it will be observed that the 

 punctures of the striae are nearly always smaller than those of the 

 intervals, or at any rate are never larger, while here the strial 

 punctures are two or three times as large as those of the intervals, 

 the latter being small and much shallower. 



In the arcnatus dietzi section there are many species in southern 

 California; latipennis Horn, as remarked by Schaeffer, is not very 

 closely allied, having more the facies of the luxatus group and need 

 not be considered in the comparisons. In none of these species 

 are the basal parts of the elytral margins in the least serrulate. 

 In the description of dietzi (Journ. N. Y. Ent. Soc., 1904, p. 197), 

 Mr. Schaeffer mentions some points that do not appear in any of 

 those described below; for example, the margins are not bluish, 

 as described of dietzi, except in gravidulus, and this differs wholly 

 in the unrounded form of the thoracic angles and in its very small 

 size; again, the author states that the elytra are but little wider 

 than the widest part of the prothorax, which is eminently not true 

 of any of those before me, and mentions certain punctures of the 

 elytral intervals which are finer and sparser than those of the striae ; 

 again gravidulus is the only one displaying any trace of punctures 

 other than those of the series, excepting of course the very small 

 foveae; he further states that the sides of the prothorax become 

 nearly straight posteriorly, which is not true of any described below, 

 also that the mandibles are faintly rugose and finally that the length 

 is 15-18 mm. and the width 7-8.5 mm. I think therefore that 

 dietzi is not included among the following three species, although 

 from the same part of the country ; they all belong to the discors 

 group of the genus. 



Callisthenes tularensis n. sp. Suboblong-oval, convex, black through- 

 out, shining though faintly alutaceous, the margins concolorous, not 

 in the least colored; head small, less than half as wide as the prothorax, 

 very minutely and sparsely punctate, feebly rugulose laterally, the 

 anterior impressions deep; labrum transversely and rtigosely impressed, 

 slightly emarginate medially; mandibles rather closely, irregularly 

 strigose; antenna? ( 9 ) as long as the thoracic width; prothorax about 

 twice as wide as long, two-thirds as wide as the elytra, parallel, the sides 

 very evenly arcuate from apex to base, the angles broadly rounded and 

 slightly produced; surface convex, steeply declivous antero-laterally 

 almost to the marginal bead and without gutter, this becoming de- 

 planate and slightly expanding posteriorly behind about the middle, 



