266 NEOTROPICAL PSELAPHIDAE 



BURIS (Fletcher, 1928) 



This is a monotypic genus which is unique among neotropical tychines in 

 having each elytral flank with a subhumeral fovea from which extends an entire, 

 broad, strong longitudinal carina. The base of the elytra have no foveae. The 

 pronotum has a transverse subbasal sulcus connecting a small lateral fovea of 

 each side. The males have seven sternites, of which the seventh is longitudinally 

 divided into a right and left plate; females have six sternites. This stemite 

 number is shared by only two other neotropical genera, Dalmoburis and Dalmo- 

 physis. The abdominal margin is limited to the base of the first tergite. Posterior 

 coxae widely separated, the separation equal to the distance between the inter- 

 mediate and the posterior coxae. 



brunneus Fletcher. 1928. In rotten trunk of Coco palm. Vera Cruz, 

 Vera Cruz, Mexico. Genotype. 



I have a good series of Buris brunneus Fletcher as follows: four males 

 Cordoba, Vera Cruz, collected in log mold July 20, 1936, by Dr. Charles Seevers; 

 two males from Huichihuyan, San Louis Potosi, in log mold June 18, 1941; 

 one male and two females from Tamazunchale, San Louis Potosi in log mold 

 June 22, 1941, by Mr. Dybas. 



These nine specimens check the ecological niche of the types and extend 

 the Mexican range of the species. 



DALMOBURIS new genus 



This new genus is distinct from other Tychini on the following combination 

 of characters: (1) Pronotum without lateral longitudinal sulci, but with a trans- 

 verse subbasal sulcus connecting a small lateral fovea on each side; (2) Elytra 

 with no basal foveae, but each elytron with a sutural stria and on the flank an 

 entire, narrow, longitudinal carina; flank with no subhumeral fovea and no 

 longitudinal sulcus; (3) Six sternites in the female sex; seven sternites in the 

 male sex, the seventh stemite being longitudinally divided into a right and left 

 triangular plate; (4) First tergite strongly margined each side by a short ex- 

 ternal carina half the segmental length, and a longer, arcuate internal carina 

 three- fourths the segmental length ; second and third tergites with a short basal 

 carina each side at base; (5) Posterior coxae widely separated by a distance 

 equal to the metastemal length ; (6) Head transverse, with simple, eleven-seg- 

 mented antennae widely separated at base on the antero-lateral comers of the 

 front; (7) Maxillary palpi four-segmented, moderately long, slender and simple. 



Dalmoburis petrunkevitchii new species 



Holotype Male. 1.0-1.2 mm. long x 0.5.-0.55 mm. greatest width. 



Shining, light reddish-brown when mature. Head subglabrous; pronotum 

 lightly punctulate, with unusually short, sparse, appressed setae; elytra dis- 

 tinctly punctate, with long coarse subappressed setae; abdomen lightly punc- 



