44 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 82 



Localities, in addition to those of type material : Highspire, Pa. ; 

 Lucaston, N.J. ; Beltsville, Md., male; Chain Bridge, Va., male; and 

 Canada, no further data, female. 



The male has always the hairs on the face silvery white, and in 

 the females before me there is some variation in the color of these 

 hairs, one from Canada having them almost golden brown, while the 

 type of perplexus has them yellowish white. 



This is the only species in which the abdomen is without red in 

 both sexes, if my identifications and assignment of sexes are correct, 

 but I have seen two males Avhich I place in fawper that appear to 

 have been too long in the killing bottle and the red is very much 

 darkened, so that they appear to have the abdomen entirely black. 

 The scutellum in pauper is distinctly longitudinally punctato-striate 

 jDOsteriorly, while in maculipes it is glossy and almost impunctate, a 

 distinction that readily separates the males of the two si^ecies. 



PSENIA, new genus 



Gener'ic characters. — Cubitus of hind wing with its base bevond 

 the median transverse vein, as in Diodontus (pi. 2, fig. 23), the anal 

 lobe more elongate than in that genus (pi. 2, fig. 24) ; occipital carina 

 complete, continued round the back of the head and not connected 

 with the one along the posterior and lateral margins of the mouth 

 (pi. 2, fig. 27) ; posterior lateral lobe of the prothorax always pale, 

 yellowish white; mandibles simple in both sexes; eps 2 not trans- 

 versely striate, generally punctate and sometimes rugose or reticulate ; 

 second and third submarginal cells of fore wing each receiving a 

 recurrent nervure, third submarginal cell shorter than in the other 

 genera, its extreme length not so great as the distance from its apex 

 to the apex of the radial vein, and not greater than its greatest width. 

 The labrum has four short teeth, while in Psen the margin is 

 rounded. In addition to these characters, the males have the 

 hypopygial spine flattened dorsoventrally, very much shorter and 

 stouter than in the other genera, frequently entirely concealed, the 

 raised lines bordering the pygidium in the females are convergent on 

 their anterior third or less, not parallel or almost so, the hind tibiae 

 are distinctly curved when seen from above, and the hind tibial spurs 

 of the males are much longer than in Pse7i and resemble more those 

 of Diodontus^ the posterior or inner one being but slightly thicker 

 than the anterior or outer one only to short of the middle, where it 

 is slightly angulate. and the females have a long downwardly 

 directed bristly hair on each mid and hind coxa that is not found 

 elsewhere in the subfamily. 



Genotype. — Mhnesa tibialis Cresson. 



