1 6 MEMOIRS ON THE COLEOPTERA 



spot of the flavopunctata group. My series of sommeri Mann., is 

 from Sonora, but Mr. Leng states that it has been reported from the 

 vicinity of San Diego, Cal.. by Henry Edwards. 



34 Marginipennis group. 



A small group of very distinct species, elongate, subparallel in 

 form, subglabrous and with dull lustre, the elytra rather narrowly 

 but continuously margined throughout externally with white, 

 having an internal medial offset, short in the type species but long 

 in schauppi. The abdomen is bright red, but in the recently de- 

 scribed segnis, which I venture to place in this group because of its 

 external resemblances, the abdomen is apparently not red but 

 metallic green. The only three species are marginipennis Dej., 

 schauppi Horn and segnis E. D. Harris. In the first the labrum is 

 short, not prominent medially but with a distinct median tooth ; in 

 schauppi it is much longer, more prominent, the medial lobe 

 arcuately truncate and with a very minute tooth. 



35 Lemniscata group. 



The singular small parallel and bright cupreous-red lemniscata 

 Lee., is the only species of this group. The labrum is but feebly 

 sinuate medially at apex and from the middle of the sinus projects a 

 small acute tooth. In view of this, as well as the statement above 

 made in regard to schauppi, I am unable to understand what Mr. 

 Leng could have had in hand when he drew the diagrams of the 

 labrum of lemniscata and schauppi on plate II of his memoir (Tr. 

 Am. Ent. Soc., 1902), as the form of the labrum in these cases is 

 nearly similar in the sexes. The white vitta of lemniscata, which is 

 discal and not marginal, may be homologous with the wonderful 

 solar spectrum arrayed in a similarly placed longitudinal vitta in 

 the Mexican aurora Thorns., except that in the former the white 

 vitta joins the outer end of a regular apical lunule, while in aurora, 

 radians and other similar forms it bends inwardly to the suture 

 posteriorly, without approaching the margin. At any rate lemnis- 

 cata has no ally in our fauna and I would not know where to place 

 it in the succession here proposed. 



