244 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 49. 



definitely said "type of the genus, Psen pallipes Panzer." He did 

 not say, type of the genus Psen pallipes Panzer as determined by me; 

 therefore Psen pallipes Panzer (not Curtis) must be the type of 

 Diodontus. This is unfortunate as Diodonius will apply to the group 

 of insects known as Neofoxia and belong to Pseninae. The Diodontus 

 of Shuckard and authors is without a name, and may be called 

 Xylocelia. The type of Xylocelia is Diodontus occidentalis Fox. 



Genus PSEN Latreille. 



PSEN (MIMESA) MODESTA, new species. 



Male. — Length 6 mm. Anterior margin of the clypeus tridentate; 

 frontal carina complete from the anterior ocellus to between the 

 bases of the antennae, not strongly raised; front coarsely striato- 

 punctate; vertex shiny, finely punctured; ocelli nearly an equilateral 

 triangle; the postocellar line much shorter than the oceUocular line; 

 antennae very slightly thickened apically, densely clothed with pale 

 pile, the third joint much longer than the fourth; mesonotum coarsely 

 striato-punctate in the middle, anteriorly the striae are more promi- 

 nent, laterally sparsely punctured; scutellum sliiny, sparsely punc- 

 tured; propodeum with triangular-shaped basal depression, coarsely 

 punctured, the sides and posterior face coarsely reticulate; petiole 

 long, almost as long as to the apex of the hind femora, when the hind 

 legs are stretched longitudinally; petiole trisulcate dorsally, uni- 

 sulcate laterally; abdomen shiny, practically impunctate. Black; 

 cheeks, face below the antennae, pleura and propodeum densely 

 clothed with silvery pile; tarsi pallid; wings dusky hyaline, iridescent; 

 venation dark brown. 



Mayaguez, Porto Rico. Described from three males. No collector 

 given. 



Type.— Cat. No. 15081, U.S.N.M. 



Genus AMMOBIA Billberg. 



AMMOBIA SPINIGER (Kohl). 



A male of this species was collected by W. Biither in the Blue 

 Mountains, vicinity of Gordon Town, Jamaica. 



Genus LARROPSIS Patton. 



LARROPSIS GRACILIS, new species. 



Related to conferta (Fox), but may be distinguished from that 

 species by the greater distance between the eyes at the vertex and 

 yellowish wings. 



Female. — Length 10 mm. Anterior margin of the clypeus rounded, 

 indistinctly dentate laterally ; head with distinct, separated punctures, 

 which are more widely separated along the median hue; space between 



