14 PROCEEDINGS OF THE NATIONAL MUSEUM vol.71 



Ammophila {Psammophila) grossa (Cresson) Melander, Psyche, vol. 10, p. 158 



(female): p. 159 (male) 1903. 

 Psammophila grossa (Cresson) H. S. Smith, Univ. Neb. Studies, vol. 8, p. 331, 1908. 

 Psammophila valida (Cresson) Mickel, Univ. Neb. Studies, vol. 17, p. 406, 1917. 

 Psammophila grossa (Cresson) Mickel, Univ. Neb. Studies, vol. 17, p. 406, 1917. 

 Psammophila valida (Cresson) Carter, Ent. News, vol. 34, p. 365, 1924. Male. 

 Psammophila grossa (Cresson) Carter, Can. Ent., vol. 57, p. 132, 1925. Female 



and male. 

 Psammophila valida (Cresson) Carter, Can. Ent., vol. 57, p. 132, 1925. Female 



and male. 



Head, thorax, petiole (usually), and legs, black; abdomen partly to 

 entirely ferruginous: fore coxa with a small tooth on its inner face 

 near its trochantal articulation. A large species. 



Female. — Head: Broad; clypeus strongly swollen centrally; its sur- 

 face covered with coarse punctures, though smaller and fewer near 

 the middle; its anterior margin rounded and bearing four broad teeth 

 on the middle third, the outer larger and reflexed; vertex rather flat 

 behind ocelli; frons and vertex rather closely punctured except near 

 ocelli; antennae black, the filament more or less brownish sericeous; 

 mandibles tinged with ferruginous over the middle third and some- 

 times the tip also. 



Thorax: Prothorax rather closely punctured like frons, its sides 

 in front of prothoracic lobe obliquely rugose; collar with a slight, 

 median, indented groove toward the mesonotum; mesonotum quite 

 uniformly punctured and with a faint median longitudinal ridge 

 between two indented lines extending about half way back; scutellum 

 with scattered, fine punctures medially; finely, longitudinal rugose 

 elsewhere; postscutellum raised centrally, its sides faintly rugose; 

 propodeal disk coarsely, irregularly rugose, averaging transverse in 

 direction, with a median ridge on front half; more or less punctured 

 between the rugosities; end of propodeum rugose with punctures be- 

 tween; sides rugose and punctured, the rugosities running downward 

 and forward; metapleuron rugose and punctured, the rugosities near 

 the mid-coxa running nearly horizontal; mesopleuron more sparsely 

 rugose, with coarse punctures between the ridges. 



Abdomen: Petiole usually black, sometimes partly ferruginous or 

 tinged with ferruginous; straight, longer than hind coxa, its terminal 

 enlargement below the first abdominal dorsal plate more or less fer- 

 ruginous; first dorsal plate often shaded with black; remaining ab- 

 dominal plates above and below usually ferruginous, but in specimens 

 from Texas, California (and elsewhere?) the last two segments and 

 sometimes a part of the next one forward may be black and the rest 

 is sometimes darkly clouded. 



Wings: Varying from hyaline to somewhat fuliginous; costal vein 

 dark, the others rather light; tegulae black in front, more or less 

 tinged with ferruginous at the lateral and hinder margins. 



