422 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



3. Head, thorax, and alidomou black 4 



Head and abdonuMi black, the thorax rufous D. kkytiluothokax Ashui. 



4. Club slender, the pedicel much shorter than the lirst funiclar Joint. 



AnteuniB and legs long, yellow, the club black; funiclar Joints all very long, 

 slender, the lirst the longest, twice as long as the pcidiccl, the others 



subequal D. Columbiana, sp. nov. 



Club incrassated, the pedicel longer than the first funiclar joint. 



Antenna^ and legs piceons or black, trochanters, base of tibi;c, and tarsi yellow. 

 Last joint of club much enlarged, 4 times as large as the penultimate, the first 

 jointdistinctly largcrthan thclastfiiiiiclarjoint ...D. aijmata Ashm. 

 Last joint of club not especially enlarged, only twice as large as the penul- 

 timate, the first joint not much longer than the last funiclar joint. 



D. COLON Say. 

 Antenn.a^ and legs rufous or reddish-yellow, the club, or the terminal Joints of 

 club alone, black. 



Three terminal joints black D. tetraplasta, sp. nov. 



Club wholly black. 

 Last four funicl.ar joints not or scarcely longer than thick. 



D. VIRGINICA, sp. nov. 

 All funiclar joints fully twice as long as thick D. mu.sc-E, sp. nov. 



Head and abdomen black, thorax rufous D. erythrothorax Ashm. 



Wholly black, antenuie and legs ringed with piceous D. musc.e, sp. nov. 



The following species described by Thomas Say iiuder the old genus 

 Psilus, probably belong in this genus: Psilus abdominalis, P. ohixsiis, 

 P. ciliatns, and P. apicalis. They remain unknown to me. 



Diapria californica, sj). nov. 

 (PI. xviii. Fig. o, 9 ; a, <? antenna.) 



9 . Length, 1.4 to 1.;") " " . Polished black, inipunctured, covered with 

 sparse long hairs; sides of colhir and petiole woolly; palpi brown black; 

 legs black, pilose, the tarsi dark brown. Antenuje 12-jointed, black, 

 sparsely pilose, terminating in a 3-jointed club; the first flagellar joint 

 is longer than the pedicel, the latter nutch the stouter; flagellar joints 

 2 to 6 subequal, the seventh a little longer and stouter than the sixth; 

 club 3-jointed, the last joint ovate, not quite twice as long as the preced- 

 ing joint but wader at base. Scutellum with a deep fovea at base 

 connected with lateral impressed lines. Metathorax opaquely sculp- 

 tured, with a prominence above and covered with a fine pubescence. 

 Wings hyaline or very laintly tinged, strongly fringed, the marginal 

 nervure wedge-shaped, rust brown; there is also a fuscous streak across 

 the wing below the marginal nervure. Abdomen ovate, polished, the 

 last segment produced into a little point, M'itli long sparse hairs; petiole 

 a little- longer than thick, I'oughened and coverc*! with a fine woolly 

 pubescence. 



The S agrees with the iemale except the antennae are 14-jointed, long 

 filiform, with the scape black, the flagellum brown, pilose; the first 



