MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPID^. 255 



Isostasius musculuB Ashm. 



(PI. XI, Fig. 5, ?.) 



Cau. Ent., xix, p. 126; Cress. Syn. Hyiii., p. 249. 



? . Length, 1.20""". Black, sbiiiiug; lieatl transverse, closely, finely, 

 microscopically punctate and subopaque, the lateral ocelli nearer to the 

 front ocellus than to the margin of the eye. Antenmv 10-Jointed, 

 piceous, or dark hi >\vn, the scape davate, the i)cdicel longer and 

 thicker than the first two fnniclar joints, the first and second fnniclar 

 joints cylindric, nearly equal, the third and fourth small, transverse; 

 club enlarged, 4 jointed, the joints quadrate. Thorax with scarcely a 

 trace of furrows. Scutellum transverse, convex. Mesopleura acicu- 

 lated. Legs brown, the coxfe black, the trochanters, base and apex of 

 femora, and tibia; and all tarsi honey-yellow. Tegula' black. Wings 

 hyaline, the submarginal vein terminating in a small, blai^k knob. 

 Abdomen jminted ovate, polished, black, the basal segment rugose. 



Habitat. — Jacksonville, Fla. 



Type in Coll. Ashmead. 



Isostasius fuscipennis, sp. nov. 

 9. Length, 1""". Black, shining; head anteriorly faintly sha- 

 greened, posteriorly transversely aciculated, the lateral ocelli about 

 twice their width from the margin of the eye. Antennte brown-black. 

 Thorax polished, with faint traces of furrows only posteriorly, the base 

 of the middle lobe thus formed projecting slightly upon the scutellum ; 

 mesopleura polished, impunctured, metapleura subopaque, sha- 

 grcened; scutellum convex, shining, margined posteriorly with a tine 

 whitish pubescence. Teguhv black. Wings fuscous. Legs piceous, 

 the anterior femora, tibise, and tarsi, yellowish; middle and hind tarsi, 

 pale rufous. 



Abdomen as long as the head and thorax, polished, the first seg- 

 ment striated, the second, at base sulcate. 



Habitat. — Washington, D. C. 



Type in Coll. Ashmead. 



Described from a single si>ecimen, collected by Mr. E. A. Schwarz. 



Isostssius arietinus Prov. 



Afld.et Corr., p. 183. 



liaoneiira arielina, Prov., Add. et Corr., p. 403. 



$ . Long. 11 pee. Noir, avec la bonclie, le scape des antennes et les pattes, d'nn 

 beau jauue-iuiel. T^te aussi large que le thorax, A. antennes fortes, le scape fort, 

 arcine, jaune aiii.si que I'article qui Ic suit, le teste formaut une forte niassne brune 

 recourbde en corne de bolier. Mesonotum a\ ec 3 sillons bien distincts. Ailes hya- 

 lines, avec la sous-niarginale brune se term in ant dans un stigma grand et (^paissi qui 

 donue naissance ^ un radius se dirigcaut vers le sommet de Tailc. Pattes jaunes, 

 hauches noires. Al>doun"U sessile, i>o!i, l>rillant. droit, tarii-re non sortaute. La 

 tete et le thorax sont trcs Hncment punctuf's et les 2 ocelles basilaires sout plus rap- 

 proclics de l'<apical que du coin interne ties yeux. {Provancher.) 



Habitat. — Cap-Rouge, Canada, 

 Unknown to me. 



