MONOGRArH OF THE NORTH AMERICAN PROCTOTRYPID.E 379 



PSILOMMA Foistcr. 

 Hyiii. Stml.,11,1). 132(1836). 

 (>pti:on Hal.. Nsit. Hist. Rev., iv, p. 170 (1K57). 



Flead .subfile )bose, the occiput rounded, the ocelli '.i in a triangle; eyes 

 oval, bare. 



Antennse in 5 incrassated toward tips, subnioniliforin, the scape lonjj, 

 the pedii'el shorter than tlie first tiajiellarjoint, the joints beyond trans- 

 verse inoniliform, the last oblon*'-; in i 14-jointed, lilifonn, the pedicel 

 rcmndcd, the first tla{;<Mlar joint elongate, cylindric, the second shorter, 

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

 scarcely twice as huig as thick, the last fusitorin, longer than the 

 penultimate. 



Mandibles short, p(>inted, but bifid at tips. 



Thorax subovoid. the pronotuni anteriorly produced iuto a slight 

 neck; uiesouotuui with two furrows; scutclluiu convex, with a i>rotbund 

 fovea at base and a transver.se, punctate line before the apex; postscu- 

 telluni flat, lugose; nietathorax carinated. 



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

 stignial short, with a long ra«(ius from itstij), fVn'ming a long, lanceolate 

 marginal cell, which is open at tip. 



Abdomen conic-ovate, subde])ressed, tlie i)etiole long. 



Legs long, the femora swollen, clavatc, the tibia' subclavate, the tarsi 

 shorter than their tibia* (except the anterior pair), the basal joint short, 

 not twice as long as the sec(md. 



Forster indicated no type. 



Psilomma columbiaiium, sp. iiov. 



(PI. XV, Fig, r>, 9 ; «, (? anotnna.) 



B 9. Length, 3.G to 4""". Polished black ; an ten nfe and legs rufous; 

 teguhne yellow. Antennje in 9 15-jointed,clavate subnioniliform, the tirst 

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

 transverse-subraoniliform, the last the stoutest, conic; in 3 14-jointed, 

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

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

 renmining cup-shai)ed, loosely articulated. Thorax narrowed l)efore, 

 with two broad furrows, the si'utellum foveated at base, the nietathorax 

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

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

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

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

 smooth, and shining; the i)etiole long, finely roughened, witli a channel 

 at the sides, t»' 'tnal segment luinctate. 



Habitat.— ington, D. C. 



Types in Co imead and !N^ational Museum. 



Described iroii 9 and 2 $ specimens. 



