ART. 4. NEW PARASITIC HYMENOPTERA GAHAN. 17 



orbits less sharply receding from the eye margins than in most of 

 the other species; viewed from in front the head is perceptibly 

 broader than high (about 6:5), truncate at the mouth, the cheeks 

 rounded and the vertex distinctly though not greatly arched above 

 the eyes; viewed from the side the front profile is weakly convex, 

 the face below the antennae receding only* slightly ; mandibles each 

 with four teeth; maxillary palpi 4-jointed, the apical joint the 

 longest joint, the penultimate joint the shortest and hardly half the 

 length of the last; labial palpi 2-jointed; antennal scape cylindrical 

 and as long as pedicel, ring-joints and three first funicle joints com- 

 bined; ring-joints distinct, subequal; funicle joints all subequal and 

 each a little broader than long; club 3-jointed and equal in length 

 to the last three funicle joints combined; mesoscutum about equal in 

 length to scutellum, with the parapsidal grooves present anteriorly 

 but effaced on the posterior one-fourth ; scutellum moderately convex 

 or at least not conspicuously flattened as in duhms Ashmead; 

 propodeum moderately hairy laterally, the apical neck distinct but 

 rather short, the spiracles elliptical and moderately large ; marginal 

 and postmarginal veins practically equal, the stigmal vein shorter; 

 abdomen pointed ovate, not longer than the thorax and usually a 

 little narrower than the thorax ; first tergite comprising approxi- 

 mately one-third the total length of abdomen; second tergite a 

 little less than half the first; following tergites shorter. Color of 

 head and thorax dark aeneous; abdomen mostly metallic blue-black 

 with the first tergite metallic green; wings hyaline, venation pale 

 yellowish; antennal flagellum dark brown, scape and pedicel reddish 

 testaceous; coxae concolorous with thorax; all femora brownish 

 testaceous, the tibiae usually a little clearer testaceous and the tarsi 

 still paler. 



Male. — Length, 1.7 mm. Agrees with female except that abdomen, 

 viewed dorsally, is nearly circular in outline and not over two-thirds 

 as long as thorax, and the funicle joints are all practically as long as 

 broad. 



Type-locality. — Ballast Island in Lake Erie. 



Type.— Cut. No. 26181, U.S.N.M. 



The type series consists of twenty specimens, many of them more 

 or less broken and imperfect, received from Miss Mary Auten and 

 all reared by her from the egg capsules of spiders. The type, allo- 

 type, and several paratypes were reared, according to the collector, 

 from the egg capsules of Aranea frondosa Walckenaer taken on 

 Ballast Island in Lake Erie. Other paratypes are said to have 

 been reared from the capsules of Epeira sclopetaria Emerton taken 

 on South Bass and Gibraltar Islands in the same lake while two 

 specimens also taken on South Bass Island are said to have come 

 from the capsule of PhUodromus canadensis. 



