THE GENUS MONODONTOMERUS — GAHAX 465 



erect hairs just dorsad of each spiracle; posterior margin of none of 

 the tergites emarginate medially; ovipositor not so long as abdomen. 



Male.— hength 2.G mm. Scape not swollen, slightly curved, and 

 wholly metallic; ocellocular line a little shorter than diameter of 

 ocellus; malar space about one-fourth length of eye; eyes rather dis- 

 tinctly pilose; abdomen not quite so long as thorax, not compressed; 

 first tergite comprising a little more than one-third length of abdomen ; 

 second and third subequal and together a little shorter than first; 

 fourth and fifth subequal and each about as long as third; sixth shorter, 

 nearly perpendicular, and with the spiracles in shallow depressions. 

 Otherwise like the female. 



Type locality. — Boulevard, Calif. 



Type.— v. S.N. M. No. 54260, 



Described from 3 females (1 holotype) and 10 males reared by L. 

 H. Weld, March 2, 1922, from a cell of Dianthidium on oak. 



2. MONODONTOMERUS AEUEUS Walker 



Monodontomerus aereus Walker, Ent. Mag., vol. 2, p. 158, 1834. 



Monodoniomerus aereus is rather easily recognized because of its 

 unusually short ovipositor, this rarely being more than half as long 

 as the abdomen. The antennae are a little shorter and thicker than 

 usual, with all funicle joints, except the first, distinctly broader than 

 long, the flagellum black, the scape usually more or less testaceous 

 basally beneath. The eyes are inconspicuously pilose, the pile very 

 short. The scutellum is about as broad as long, its apex behind the 

 cross furrow uniformly strongly sculptured with longitudinal rugae, 

 and with the marginal groove uninterrupted medially. The post- 

 scutellum is smooth, distinctly broader than long, and has a distinct 

 median carma. The propodeum at base on each side of the median 

 carina has a large, more or less rounded, and rather deep depression 

 and behind this a much smaller one, the surface of propodeum between 

 the median depression and the spiracular sulcus strongly sculptured. 

 The fore wmgs extend beyond the apex of the abdomen nearly to the 

 apex of the ovipositor and are hyaline and without a fuscous cloud 

 at the stigmal vein. The tooth on the hind femur is prominent and 

 rather broad. The abdomen is about as long as the thorax, the first 

 tergite dorsally perfectly smooth and comprising approximately one- 

 third of the length of the abdomen, the following tergites m.ore or less 

 distinctly sculptured. The head and thorax have the usual type of 

 sculpture for the genus and are nearly imiformly greenish black with 

 a brassy tint. The coxae and femora are concolorous with the thorax 

 and the tibiae and tarsi are reddish brown to dark brown. The first 

 tergite is bluish green and the following tergites blackish with a 

 metallic sheen. The length of the bodv ranges from 2.3 to 3.5 mm. 



