LISTRIMORPHA, NEW GENUS 189 



Pronotum transverse, about a third wider than long, base slightly 

 wider than the apex; sides angulate just slightly in front of the middle, 

 thence quite straight and convergent to apex, straight, convergent or 

 parallel posteriorly to base, .margin serrulate; apex feebly emarginate; 

 apical angles obtuse and very slightly rounded; basal angles distinct, 

 obtuse to rectangular and somewhat reflexed; base transverse in middle 

 two-fourths, thence oblique and feebly sinuate to the basal angles ; disk 

 moderately convex, rather evenly so in central area and at apex, more or 

 less broadly and distinctly impressed in the region of the basal angles and 

 along the sides to the angulation, and very feebly so across in front of the 

 base, slightly constricted laterally behind the apex, very finely and 

 sparsely punctate, slightly asperate in the lateral area. 



Elytra oblong, slightly dilated behind the middle, about twice as long 

 as wide, feebly convex on the disk, more strongly so laterally; apices 

 slightly dehiscent, angles obtuse ; finely and sparsely punctate. Scutellum 

 transversely oblong. 



Under surface of the body finely sculptured. 



Measurements. Length, 2.6 mm. ; width, 1.0 mm. 



Holotype, male, and allotype, female, in my own collection ; paratypes 

 in that of Mr. F. W. Nunenmacher. 



Type locality. Goldfield, Esmeralda County, Nevada. Collected by 

 Mr. Nunenmacher on June 29, 1907. Five specimens studied. 



Remarks. This species is distinct in having the pronotum without a 

 submarginal line or lateral rugose area and short ungual appendages. 

 In Casey's table of the Melyrid tribe Dasytini it falls between Dasytastes 

 and Eschatocrepis, and by its general facies and structural characters it is 

 more closely related to the latter genus. From both Listrus and Eschato- 

 crepis it can be recognized by the subangulate sides of the pronotum, the 

 latter less convex and with serrulate lateral margins. 



The fifth ventral segment has the apical margin set with a line of 

 short and rather stiff hairs. Sexual differences are not very evident in 

 the small series at hand. 



Listrimorpha should precede Eschatocrepis in our lists. 



Dasytastes vanduzeei, new species. Form subovate. Color black; 

 head, prothorax, legs and basal portion of the antennae, rufo-f ulvous ; 

 metasternum more or less rufous. 



Pubescence rather short and recumbent, quite dense on the elytra, 

 somewhat less so on the pronotum and under surface of the body. 

 Abdominal surface dull. Elytra feebly aeneous and maculate with several 

 slightly elongate blackish spots, those of the apical half anastomosing to a 

 greater or less extent. 



