422 BULLETIN 45, UNITED STATES NATIONAL MUSEUM. 



3. Head, thorax, and abdomen black 4 



Head and abdomen black, the thorax rufons D. EKYTiiUdTiioitAX AHhui. 



4. Club slender, the i)edicel much shorter than the first fiiniclar Joint. 



Autenme and le;i8 long, yellow, the clnb black ; fnniclar Joints all very long, 

 slender, the first the longest, twice as long as the jicdicel, the others 



Hubeqnal D. «<)I,i;mbiana, sp. uov. 



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

 Anteunie and legs piceous or black, trochanters, base of tibia', and tarsi yellow. 

 Last joint of club much enlarged-, 4 times as large as the ])ennltimate, the first 

 Jointdistinctly largerthan thelastfuniclar joint ...D. aumata Ashm. 

 Last Joint of club not especially <mlarged, only twice as large as the penul- 

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



D. COLON «ay. 

 Antenna' and legs rufous or reddish-yellow, the club, or the terminal joint of 

 clnb alone, black. 



Three terminal joints black D. tetrai'lasta, sp. nov. 



Club wholly black. 

 Last four funiclar Joints not or scarcely longer than thick. 



D. VIRGINICA, sp. nov. 

 All funiclar joints fully twice as long as thick D. Mt'sc^t:, sp. nov. 



MALES. 



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



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



The following species described by Thomas Say under the old genus 

 Psilus, probably belong in this genus: Psilus ahdomlnaliH, P. ohtustis, 

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



Diapria californica, sp. nov. 

 (PI. XVIII, Fig. 3, 9 ; a, i antenna.) : . 



5 . Length, 1.4 to 1.5 "" . Polished black, impunctured, covered with 

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

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

 sparsely pilose, terminating in a 3-jointed club; the firr.t flagellar joint 

 is longer than the pedicel, the latter nm(!h 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 jireced- 

 ing joint but wider at base. Scutellura with a deep fovea at base 

 connected with lateral impressed linc«. Metathorax opaquely sculp- 

 tured, with a i>rominence above and covered with a fine pubescence. 

 Wings hyaline or very faintly 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, with long sparse hairs; petiole 

 a little longer than thi<?k, roughened and covered with a fine woolly 

 pubescence. 



The S agrees with the female except the antennai are 14-jointed, long 

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



