30 PROCEEDINGS OF THE NATIONAL MUSEUM vol.69 



39. All coxae black; first abdominal tergite very faintly reticulately sculptured 



and strongly shining; second and following tergites polished; malar 

 space at least half as long as the eyes; head and thorax black; ab- 

 domen black, with second and usually base of third tergites brownish; 

 ovipositor sheaths nearly as long as the body 



39. californicus, new species. 



Anterior and middle coxae very rarely black and then not agreeing entirely 



with the above 40. 



40. First abdominal tergite completely black; the second usually more or less 



yellowish; the third and following entirely black; head and thorax al- 

 ways black; antenna usually 30 to 36 segmented 



40. cinctus (Cresson) . 



First and second tergites, and sometimes more, of the abdomen red; rarely 



the first tergite partly blackish; head and thorax sometimes varied with 



ferruginous or testaceous 41. 



41. Head black with more or less of the clypeus usually reddish yellow; thorax 



entirely black; propleura rugulose anteriorly, polished behind; abdomen 

 usually with the apical half of third and all of the following tergites black 



41. agilis (Cresson). 



Head usually mostly testaceous; thorax varying from entirely black to 



entirely yellowish ferruginous; propleura usually evenly granular, not 



rugulose anteriorly 42. discolor (Cresson). 



1. BASSUS MARGINATIFRONS, new species 



Female. — Length, 8.5 mm. Face apparently a little broader than 

 long from antennal foramina to apex of clypeus, with a small, shallow, 

 median impression just below antennae; malar space less than half 

 the eye height; maxillary palpi rather long, the two basal segments 

 somewhat thickened, the three apical segments slender; labial palpi 

 stout, the third segment exceedingly small, scarcely apparent; eyes 

 large, prominent, broadly oval, attaining the vertex, which is not at 

 all convex; frontal impressions distinctly carinate, a carina arising 

 at each side near the eye and extending toward the lateral ocelli, but 

 bending sharply downward before attaining the latter, and converg- 

 ing below the median ocellus; ocelli prominent; ocell-ocular line fully 

 twice as long as the diameter of an ocellus; occiput flat, not exca- 

 vated; antennae long, stout, tapering slightly, 51-segmented in type 

 all the flagellar segments longer than broad; thorax rather slender, 

 distinctly deeper than broad, mesonotal lobes prominent, defined by 

 distinct, polished parapsidal grooves; the middle lobe with a weak 

 median longitudinal ridge: scutellum slightly convex, with a trans- 

 verse impression just before apex and the apex margined by an irreg- 

 ular carina; suture in front of scutellum deep and broad, divided into 

 two pits by a median septum; propodeum polished, with a short 

 basal median carina which divides to set off a long, narrow, triangular 

 areola; basal lateral areas not delimited; lateral longitudinal carinae 

 and apical transverse carina prominent; petiolarea defined; propodeal 

 spiracle rather large, elliptical; propleura completely polished; meso- 

 pleura polished, with a broad, coarsely foveate longitudinal furrow; 



