MONOGRAPH OF THE NOKTH AMERICAN PKOCTOTRYPID.^. 277 



Isorhombiis arizonensis, sp. iiov. 



9. Leu.iitli, 2""".^ Black, liigbly polished; parapsidal furrows ob- 

 solete anteriorly. Head very wide, not very tbick antero-posteriorly, 

 the lateral ocelli far away from the margin of the eye. Mandibles 

 ])i('eons. ^Vnteiina' 10 Jointed, rufo-pieeons, the flagellum twice the 

 length of the sca[)e5 iiedicel a little louger than thick; joint 1 of fnni- 

 cle very minute, closely joined to the second, second about twice the 

 length of third; club 5-jointed, cylindric, the joints, except the last, 

 nearly e([ual, longer than thick, the last cone-shaped, a little longer 

 than the penultimate. Scutellum coni(;ally elevated posteriorly, de- 

 pressed at base, sparsely pubescent and with a small acute spine at 

 tip. Metathorax, hind coxie and petiole, pubescent. Legs brownish- 

 yellow, the coxa; black. Teguhe black. Wings hyaline, pubescent, 

 extending, when folded, scar(;ely beyond the tip of the abdomen. Ab- 

 domen long-oval, polished, about as long as the head and thorax 

 together, the basal joint very little longer than wide, densely pubes- 

 cent, the margin very wide. 



Habitat. — Fort Huachuca, Ariz. 



Type in National Museum. 



Described from a single specimen, reared May S, 1S83, from a Cecido- 

 myiid gall on an unknown xdant, sent to the Dei>artnient. by Mr. H. K. 

 Morrison. 



POLYMECUS F<hster. 



Hym. Stud., ii, p. 144 (1856). 

 Ectadius FOrster, loc. cit., ]). 108. 

 Epimeces Westwood {pars). 



(Tyjie P. craferiis Walk.) 



Head transverse, the occiput delicately margined; ocelli 3, in a curved 

 line, the lateral ocelli only their width from the eye margin. 



AntenniB 10-jointed in both sexes, the scape long, subclavate; in 

 the 9 the club is 4 or 5 jointed, when 4-jointed the last funicle joint is 

 shorter than the preceding, when 5-jointed the last two funiclar joints 

 about equal or the last the longer; in S with a T)- jointed, bearded club, 

 the second funiclar joint being somewhat swollen and curved or twisted, 

 the first being small. 



Thorax ovate, the prothorax distinct from above, the mesouotum 

 much longer than wide (nearly twice as long as wide), usually with 2 

 distinct furrows; scutellum convex, often, but not always, with a tuber- 

 cle or spine at tip, the basal part of the middle lobe of mesouotum pro- 

 jecting slightly upon it at base; metathorax short, with 2 carin;edowu 

 the center, the metapleura densely i)ubescent. 



Front wings pubescent, veinless, rarely with the submarginal nerv- 

 ure visible, when present not knobbed at tip; in 9 the wings, when 

 folded, do not extend to the apex of the long abdomen. 



