100 CHARLES W. LENG. 



map of California, I have prepared a sketch map of the State from 

 information furnislied by Dr. Van Dyke to show the range of each 

 species. 



There are also differences in the form of the labrum, but T cannot 

 satisfy myself that they indicate specific difference. Such differences 

 are not accompanied by difference in distribution, and the labrum is 

 subject to considerable individual variation not only in this genus but 

 in C'icindela. 



In Dejeani there is a marked failure of the side margin of the 

 thorax to meet the basal margin and this character is repeated in 

 some of the smaller species, e.g., Audouiaii, but it also is subject to 

 individual variation. 



The form of the thorax and elytra is exceedingly variable and on 

 such characters the individuals now called californicus, for example, 

 might be divided into a number of species. I have used this character 

 very sparingly, and only when supported by geographical distribution. 

 To collectors of Ovius the general form, no doubt, becomes the most 

 evident character, but it is more difficult for us in the East to appre- 

 ciate and most difficult to describe successfully. 



The species may be arranged according to their sculpture as fol- 

 lows, the inserted localities being approximate for the sake of brevity, 

 and the exact localities being given under each species: 



SYNOPSIS OF OMUS. 



Elytra conspicuously foveate ; very large. Vane, Wash., Or Dejeani. 



Elytra not foveate. 

 Thorax deeply wrinkled, highly polished. Coast Region near San Francisco. 



californicus. 

 Thorax less deeply wrinkled and more smooth, but without any smooth space 

 at centre. 

 Larger, sides of thorax converging in nearly straight outlines to the base. 



rljvcer Co Ed wardsi i . 



Average size; sides of thorax less convergent and more arcuate in outline. 

 Form slender, widest before the middle and tapering thence to apex, labrum 



truncate. Southern Coast Range Lecontei. 



Form slender, widest at the middle; labrum bisinuate, advanced in the 



middle. Sierra of Mariposa Co intermedium. 



Form short and robust ; labrum bisinuate, advanced in the middle. Southern 



Sierra sequoiarum. 



Thorax much smoother with a central space free from wrinkles. 

 Color, black as usual. 



Elytra confusedly punctate, antennre slender. Vane, Wash., Or., No. Cal. 



Audouinii. 



