BRUES: PARASITIC HYMENOPTERA. 89 



A typical Mesochorus, except that the abdomen appears to be more 

 flattened than usual near the tip. 



Of the numerous genera included in the Porizonini, only one, 

 Porizon, has been found fossil, one species by Brischke ('86) in Baltic 

 Amber, and a second among the present material. 



Porizon exsectus, sp. nov. (Fig. 71.) 



Length 6 mm. Head and thorax nearly black, abdomen brownish yellow, 

 the petiole fuscous. Legs pale brown, the hind pair somewhat darker. 

 Wings hyaline. Head and thorax very 

 finely punctulate, the metanotum areolated ; 

 petiole of abdomen one-half as long as the 

 thorax, tip of abdomen not preserved. Wings 

 with a large, almost triangular stigma ; first 

 section of the radius distinctly less than half 

 as long as the second which meets it at a 

 right angle; transverse cubitus oblique, Fig. 71. — Porizon exsectus, sp. 

 almost a continuation of the first section of nov - Type- 



the radius, interstitial with the recurrent 



nervure below; median and submedian cells of equal length; marginal as 

 long as the discocubital cell. 



Type.— No. 2286, M. C. Z., Florissant, Col. (No. 3223, S. H. 

 Scudder Coll. The specimen shows the head, thorax, both front 

 wings, and the basal part of the abdomen, and there can be no doubt 

 that it is a true Porizon. 



So far no representatives of the Pristomerini have been found in a 

 fossil state. 



Demophorus antiquus, sp. nov. (Fig. 72.) 



Female. Length 6.5-7 mm. Color probably dark or brownish, the tips of 

 the hind femora darker and the head black. Antennae long, slender, involute, 

 of equal thickness throughout; more than 30-jointed, the joints of the apical 

 portion about quadrate, those nearer the base of the flagellum longer. Thorax 

 almost evenly arcuate above when seen from the side ; the metathorax rather 

 sharply declivous behind, regularly and completely areolated. Abdomen 

 compressed strongly toward the apex; petiole long, slender, straight, but 

 little thickened on its apical three- fifths ; second segment about as long as the 

 first, twice as high at its tip as at the base. Legs stout, especially the posterior 

 femora, which are much thickened, but apparently without any teeth below 

 near the apex. Wings hyaline or nearly so, stigma and veins piceous. Stigma 



