NORTH AMERICAN HYMENOPTERA. 41 



known to the Euroj)ean fauna, Marshall believes to be a variety of 

 the former. 



Our species may be tabulated as follows : 



Honey-yellow species 2. 



Head and thorax black. 



Metathorax rugose, but more or less distinctly areolated. 

 Legs, except hind femora, which are black or fuscous, rufous; abdomen, 

 except first segment, rufo-piceous : antennae black, or brown-black, 



multiarticulated, 9 H. aniericaiius Ashm. 



Legs, including coxsb, pale ferruginous, or brownish yellow ; abdomen, ex- 

 cept first segment, ferruginous; auteunse 30-jointed, towards base 



pale, % H. erythrogaster sp. n. 



Metathorax finely rugulose, not areolated. 



Legs and collar pale honey-yellow; abdomen brownish piceous, pale yel- 

 lowish at base beneath ; ovipositor a little longer than half the length 

 of abdomen, black; antennse, except first two joints, black; 19- 



jointed, 9 H. pallidipes sp. n. 



2. — Head, except the clypeus and mandibles, black. 



Antenuffi, except first two joints, black ; 18-19-jointed, % 9 • 



II. atriceps sp. n. 

 Antennae pale, 20-joiti ted, %, 9- 



Mesothoracic lobes, the middle at base and the laterals toward outer mar- 

 gin, scutellum at sides, metathorax and shield of first abdominal 

 segment dusky ; ovipositor one-fourth the length of abdomen. 



H. vulgaris sp. n. 



1. Horiuius americaiitis Ashm., Bull. No. 1, Col. Biol. Asso. 1890, p. 16. 

 9. — Length 2.6 mm.; ovip. 0.4 mm. Black; tegulfe and legs, except the 



femora, rufous; the femora obfuscated, the posterior pair almost black ; abdon)en 

 rufous. Head and thorax, except the middle lobe posteriorly, smooth and shin- 

 ing; middle lobe posteriorly just in front of scutellum wrinkled or rugose; 

 mesopleura polished with a smooth, longitudinal furrow at base ; scutellum 

 smooth, with two large, shallow, crenate foveae at base; metathorax rugulose, 

 indistinctly areolated ; antennse long, black, multiarticulated (broken at tips), 

 the joints of flagellum a little more than thrice as long as thick. Wings hyaline, 

 strongly iridescent, the stigma and venation brown, the second submarginal cell 

 twice as long along its lower side as along its upper side, the first abscissa of ra- 

 dius a little shorter than the second transverse cubital. Abdomen rufous aluta- 

 ceous, the plate of the first segment sculptured and with parallel raised lateral 

 margins. 



iZa6.— West Cliff, Col. 

 Type in coll. Ashmead. 



The single specimen of this species was taken by Mr. T. D. A. 

 Cockerel 1. 



2. Horinius erytliroga!i>ter sp. n. 



% . — Length 2.8 mm. Head, thorax and first abdominal segment, except the 

 lateral membranous parts, black; palpi whitish; mandibles ferruginous; an- 



TKANS. AM. ENT. SOC. XX. (6) APKIL. 1893. 



