MONOGRAPH OF THE NORTH AMERICAN PROCTOTRYPID.E. 183 



Front wings ]>abes(,'ent, cilialcd, the cilia on liiud iiiiiigiii very long, 

 the marginal vein linear, al)out live times as long as the short stigmal, 

 the por.tmarginal wanting. 



Abdomen long-oval, depressed, s])arsely pilose, the first segment 

 longer than wide, tinted, the third the largest; the lirst three segments 

 are longitudinally striated. 



Legs rather long, slender, ])ilose, the tibial spuis minute, the tarsi 

 slender but spinulose. 



This genus, known only in the male sex, is distinguished trom Frosa- 

 cantha by the 3-spined postscutellum, and in having distinct meso- 

 notal furrows; from Xeno'inerus, whi(;h also has mesonotal furrows, it 

 is separated by the postscutellum and the Uliforni auteunic. 



It may be the opposite sex of Pentacantha, agreeing with it in its 

 postscutellar character, but the mesonotion has tico difitincffHrroirs, and 

 as I know of no genus in the Proctotri/pidw having the mesonotum 

 grooved in one sex and plain in the opposite, I believe it to be dis- 

 tinct. This character, used in the table of the males, is therefore 

 repeated in the generic table of the females. 



Only two species are known to me, which may be separated as follows : 



Black; legs rufous, coxu- black. 



Sciitelluin .sinin)th, polished T. amehicana Ashiu. 



Scutelluiii rugose T. rucosa, sp. uov. 



Trissacantha americana Ashm. 



(PL \iii, Fig. 2, c?.) 



Ent. Am., iii, p. 117; Cress. Syn. Hym., p. 313. 



S. Length, 2,5""". Polished black, inibescent; head and occiput 

 with >^ome stria'; mandibles i)iceous; legs rufous, the coxa' black. 

 Antennae 12-jointed, filiform, black, longer than the body, the scape 

 not much longer than the first flagellar Joint, the pedicel annnlar, the 

 flagellar joints all long, cylindri(;al, the first about five times as long 

 as thick, the second shorter, the thiid angulated at the middle and 

 slightly excised at base. Mesonotum with two distinct furrows; scu- 

 tellnm semicircular, smooth, polished; postscutellum with three erect 

 spines, the middle the longest. Abdomen longer than the head and 

 thorax together, longitudinally striated. Wings fusco-hyaline, pu- 

 bescent. 



Habitat. — Florida, District of Columbia and Virginia. 



Type in Coll. Ashmead; specimens in National Museum. 



This species was originally described from a specimen taken by 

 myself in Florida, but I have since seen sijecimens taken in Virginia 

 and District of Columbia. 



Trissacantha riigosa, sp. iiov. 



S. Length, 2.0"'"'. Black, shining, i)ul)e.scent; head above, collar 

 and scutellum rugoso-pun(^tate, the mesonotum smoother, the lace near 



