io MEMOIRS ON THE COLEOPTERA 



oblique. The group includes hirticollis Say, gravida Lee., ponder osa, 

 Thorns. all distinct species and abrupta* a subspecies. 



16 Tenuisignata group. 



Consists of tenuisignata Lee., alone, so far as known. It is more 

 slender than any of the immediately preceding groups and differs 

 greatly in having the front bald in both sexes ; it has a well developed 

 reflexed fascia and humeral lunule as in the repanda group, but with 

 all the markings very slender. There are some more or less similar 

 species in the Mexican fauna for example, fera Chev. This is 

 abundant in Durango and has a perfectly bald front in both sexes, 

 excepting one or two setae near the eyes and is therefore properly 

 a member of the repanda group, the markings being similar. 



17 Tortuosa group. 



In this group the body is rather small, the front bald in both sexes 

 and the elytral markings are very fine but much extended, the fascia 

 assuming an oblique serpentine course almost attaining the suture 

 near posterior fourth; the humeral lunule is nearly as in the hirti- 

 collis group, except that the straight inflexed posterior part is more 

 posteriorly oblique and the hind part of the marginal dilatation at 

 the point of origin of the fascia is dilated, tending to isolate itself 

 to form the posterior marginal spot of the rufiventris group. The 

 species are few in number, comprising tortuosa Dej. and sigmoidea 

 and serpens of LeConte; serpens is by no means a synonym of 

 tortuosa, being a very much smaller, more slender and more delicate 

 species. 



1 8 Gabbi group. 



The body is of nearly similar size and outline and the front is 

 similarly nude, but the elytral markings are much heavier and of 

 radically different development, the anterior extension from the 

 outer part of the apical lunule being more elongate than in any 

 other known species, and, between it and the suture, is projected the 

 very long posterior ramus of the medial fascia; the only species is 

 gabbi Horn, from San Diego, California. 



