HYMENOPTERA I'Jl 



Hind coxje black ; anterior and middle legs ferruginous or reddish, 

 the hind legs black or fuscous, their tibiae more or less ferru- 

 ginous basally. 



Antennae 23-jointeci; abdomen with the petiole shagreened, the second 



and following segments smooth. Male S. mandibularis. 



Antennae 21-jointed, very long; abdomen with the petiole and the sec- 

 ond segment finely shagreened, those beyond smooth. Male. 



5'. sitkensis. 

 6. Antenna 25-jointed; sheaths of ovipositor black; wings hyaline, the 

 costal vein and the stigma light brown or brownish-yellow, the sub- 

 costal vein and the internal veins dark brown. 'M.a\Q...S. ferrttgineus. 



STIBOSCOPUS SANCTIPAULI sp. nov. 



Female. — Length 2.5 mm. Polished black, the ovipositor about 

 one-third the length of the abdomen, the sutures of the trochanters, 

 tibise and the extreme apices of the tarsal joints dark rufous. Antennae 

 20-jointed, thickened toward apex, the first joint of the flagellum only 

 about two-thirds the length of the second. Wings subhyaline, the 

 stigma and veins brown. The head is large, quadrate ; the mesonotum 

 on the disk is flat, the scutellum with a crenate furrow across the base ; 

 the metathorax is completely areolated, the areola nearly horse-hoof 

 shaped. Abdomen polished, shining ; the first segment is feebly 

 coriaceous at sides and towards base, polished at apex, the second and 

 third segments large, subequal, broader than long, the second a little 

 longer than the first. 



Type. — Cat. No. 5576, U. S. Nat. Museum. From St. Paul Island, 

 August 15 (Fur Seal Commission). One specimen. 



STIBOSCOPUS ALASKENSIS sp. nov. 



Female. — Length 3.4 mm. Polished black; legs, except the 

 middle coxte, basally and the hind coxae ferruginous; antennie 21- 

 jointed, the first joint of the flagellum a little longer than the second, 

 with a pale annulus at base. Wings hyaline, the stigma and veins 

 yellowish. The head is transverse quadrate, the mesonotum feebly de- 

 pressed posteriorly, the scutellum with a non-crenate furrow across the 

 base, the metathorax areolated, the areola hexagonal, wider than long. 

 Abdomen oblong-oval, similar to S. sanctipatdi., except that the petiole 

 or first segment is longitudinally striate. 



Type. — Cat. No. 5577, U. S. Nat. Museum. From St. Paul 

 Island, August 15 (Fur Seal Commission). One specimen. 



