URUKS: PARASITIC HYMENOPTERA. 



87 



light brown or yellow; hind pair, except coxae, trochanters and base of tibiae 

 blackish. Antennae rather stout, imperceptibly thickened toward the tips; 

 basal joints of flagellum about three times as long as thick, the apical ones 

 quadrate; they are about 23-jointed. Mesonotum quite distinctly punctulate; 

 nietanotum regularly and completely areolated. Abdomen clavate; petiole 

 long and slightly curved both above and below, fully one-fourth longer than 

 the second segment; third to 

 fifth growing higher, but shorter. 

 Ovipositor as long as the first 

 and second abdominal segments 

 together. Wings small, hyaline, 

 with fusco-ferruginous stigma 

 and veins. Stigma very broad, 

 triangular. Marginal cell short 

 and broad, the second section of 



the radius straight, very oblique, and fully four times as long as the first 

 which is no longer than the thickness of the stigma; discocubital cell short, 

 the discocubital vein strongly but evenly curved; median and submedian 

 cells of equal length. Areolet rather small, subsessile, long oblique, but 

 tending to be rectangular. Legs slender. 



Type.— No. 2279, M. C. Z., Florissant, Col. (No. 13,788, S. H. 

 Scudder Coll.). In all there are four specimens before me; the type, 

 Nos. 2280-2281, M. C. Z., Florissant, Col., Nos. 9678 and 8945, 

 (Fig. 68) Scudder Coll., and No. A67 collected by Professor Cockerell 

 at Station 17. 



Fig. 68. — Mesochorus cataclysmi, sp. nov. 



Mesochorus aboriginalis, sp. nov. (Fig. 69.) 



Female. Length 5-6 mm. Black, or dark colored, the abdomen beyond 

 the base of the second segment reddish brown. Legs so far as preserved 

 brownish beyond the coxae. Head seen in lateral aspect smooth, but seem- 

 ingly not polished; mesonotum like the head, but with a few transverse 



wrinkles anteriorly; pleurae deli- 

 cately sculptured, more or less 

 obliquely or irregularly wrinkled. 

 Metathorax areolated, the areas 

 smooth, slightly rugose apically. 

 Abdomen about one and one-half 

 times as long as the thorax, 

 petiolate, the petiole three-fourths 

 the length of the posterior slope of the metathorax, gradually and slightly 

 thickened apically; remainder of abdomen subclavate, the second segment 

 three-fourths the length of the first; third only two-thirds the length of the 

 second; fourth and fifth gradually shorter. Ovipositor about as long as the 



Fig. 69 

 Type 



Mesochorus aboriginalis, sp. nov. 



