214 NEW SPECIES MELYRIDAE, CHRYSOMELIDAE AND TENEBRIONIDAE 



different individuals ? So it is with my series of Eusattus difficilis, taken 

 on the same small peninsula, about the same bay, same climate and at 

 different seasons. They vary in surface lustre, from opaque to somewhat 

 shining, prosternal process fully margined to not at all, elytra with 

 irregular and more convex longitudinal lines or none at all, sides of the 

 pronotum noticeably declivo-explanate to scarcely so, pronotal disk with 

 small but distinct punctures or obsoletely punctate, prosternal process 

 narrow or broader, all these variations are present in my series of speci- 

 mens, they gradate one into the other. So far the diagnosis is clear. 



In the collection of the California Academy of Sciences there are a 

 few specimens of Eusattus taken on San Martin Island, Lower California, 

 July 11, 1905, by F. X. Williams while on the Galapagos Islands Expe- 

 dition. These specimens agree, character for character, with certain of 

 the specimens collected at San Diego. The individuals of the small series 

 differ among themselves, the pronotum is distinctly declivo-explanate 

 laterally in one, scarcely so in another and to an intermediate degree in 

 another. The most surprising thing is that I cannot separate them by 

 any character from a specimen taken by Mr. Frank Daggett, in the Kings 

 River Canyon, California. The San Martin Island specimens are smaller 

 and rather more oblong than the average difficilis, but agree in these 

 characters with a minority of specimens from San Diego. Does geo- 

 graphical position make the San Martin Island specimens a distinct species 

 from those taken at San Diego? Or, am I right in my conclusions that 

 they are all of one species namely, difficilis f 



Eusattus vanduzeei, new species. Form oblong-oval, strongly con- 

 vex, and about one-half longer than wide. Color deep black, surface 

 smooth and shining. 



Vertex of the head quite impunctate, elsewhere rather evenly and not 

 closely punctate, punctures rather less than moderate in size, densest on 

 the epistoma, the latter triangularly sinuate at middle, angles rounded into 

 the arcuate sides, which are feebly or not sinuate at the oblique sutures, 

 the latter may or may not be evident ; frontal suture more or less distinct 

 and arcuate between the 'oblique sutures ; margin of the epistomal lobes 

 slightly reflexed. 



Pronotum strongly convex from side to side, quite obliquely declivous 

 laterally and rather more than narrowly explanate at the sides ; apex and 

 side margins finely beaded, base not beaded but sinuate laterally, median 

 lobe broad and feebly arcuate; basal angles obtuse and rather narrowly 

 rounded; apical angles subobtuse; disk sparsely punctate laterally, punc- 

 tures fine and subobsolete in the central area, coarser laterally; sides 

 ciliate. 



