MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPID.E 379 



PSILOMMA Fr.ister. 

 Hym. Stud., II, p. 132(1856). 

 Ojxizon Hal., Nat. Hist. Rev., iv, p. 170 (18.57). 



Head subglobose, the occiput rounded, the ocelli 3 in a triangle; eyes 

 oval, bare. 



Anteniue m 9 incrassated toward tips, submoniliforin, the scape long, 

 the pedicel shorter than the first tiagellar joint, the joints beyond trans- 

 verse- n ion iliforin, the last oblong; in (J l-l-jointed, filiform, the pedicel 

 rounded, the first flagellar joint elongate, cylindric, the second shorter, 

 slightly excised outwardly at base, the joints beyond to the last short, 

 scarcely twice as long as thick, the last fustfonn, longer than the 

 penultimate. 



Mandibles short, iiointed, but bifid at tips. 



Thorax subovoid, the pronotum anteriorly produced into a slight 

 neck; mesonotum with two furrows; scutellum convex, with a profound 

 fovea at base and a transverse, punctate line before the apex; postscu- 

 tellum flat, rugose; nietathorax carinated. 



Front wings pubescent, fringed, the marginal vein punctiform, the 

 stigmal short, with a long radius from its tip, forming a long, lanceolate 

 marginal cell, which its open at tip. 



Abdomen conic-ovate, subdepressed, the petiole long. 



Legs long, the femora swollen, clavate, the tibiae subclavate, the tarsi 

 shorter than their tibi.e (except the anterior pair), the basal joint short, 

 not twice as long as the second. 



Forster indicated no type. 



Psiloninia colunibianum, sp. uov. 

 (PI. XV, Fig. .5, $ ; (I, (? anetuna.) 



S 9. Length, 3.6 to 4""". Polished black; antenna? and legs rufous; 

 tegulfe yellow. Antennse in 9 15-jointed,clavate-submoniliform, the first 

 flagellar joint a little longer than the pedicel, the following to the last 

 transverse-subraoniliform, the last the stoutest, conic; in S 14-jointed, 

 filiform, the pedicel small, round, the first flagellar joint the longest, 

 about 3^ times as long as the pedicel, the second slightly shorter, the 

 remaining cup-shaped, loosely articulated. Thorax narrowed before, 

 with two broad furrows, the scutellum foveated at base, the nietathorax 

 subquadrate, rugose. Wings subfuscous, the marginal vein puncti- 

 form, the first branch of radius very short, the second branch visible as 

 a long fuscous streak, forming a very long, lanceolate, open marginal 

 cell. Abdomen conic-ovate, ])ilose beneath and toward tip, black, 

 smooth, and shining; the petiole long, finely roughened, with a channel 

 at the sides, the anal segment punctate. 



Habitat. — Washington, D. C. 



Tyj)es in Coll. Ashmead and National Museum. 



Described from 1 9 and 2 S specimens. 



