52 bulletin: museum of comparative zoology. 



Lithotiphia, gen. nov. scudderi, sp. nov. 



Length about 12^ mm., anterior wing about 8| ; black, the abdomen without 

 light spots ; head round, its width 2^ mm. ; width of thorax (doubtless increased by 

 crushing) about 4 mm. ; abdomen about 6| mm. long and 3 broad ; hind femora 

 cylindrical, rather stout, with a little concavity followed by a prominence at apex 

 beneath, as in other Tiphiids ; hind tibiae greatly swollen, apparently not dentate ; 

 hind tarsi very slender. Wings with apparently a very large stigma, but the 

 microscope shows that this is the stigmal cell, not nearly filled by the long and 

 slender true stigma, which is brown, as long as stigmal cell, but only about 105 

 (this and all following measurements in fj.) broad ; the stigmal cell is about 675 long, 

 and 255 broad, broadly truncate posteriorly, and with a rudimentary cross-nervure 

 before the middle, almost meeting the radial nervure (in a modern Scolia I can 

 detect such a cross-nervure, but still more rudimentary) ; marginal cell entire, 

 exceedingly broadly rounded apically, the actual tip not on costa, length of the 

 cell 1050; three submarginals, the second very broad, 750 long on marginal, 

 receiving the first r. n. nearly 600 from its beginning, and 450 from its end; third 

 s. m. broadly bulging apically, not surpassed by the marginal ; length of third 

 s. m. on marginal 750 (same as second s. m.) ; second r. n. joining third s. m. 375 

 from its base, and 450 from its lower apical corner ; the second r. n. joins the cubi- 

 tal nervure in such a way that the outer angle formed is less than a right angle. 

 B. n. going very slightly basad oft. m., which is strongly oblique. 



Type. — No. 2022, Mus. Comp. Zool. Florissant, Col. (No. 2440, S. H. 

 Scudder Coll.). 



POMPILIDAE. 

 Hemipogonius florissantensis, sp. nov. 



Length nearly 15 mm., anterior wing about 10 mm. ; anterior wmgs with a 

 transverse dark cloud or suffused band at about the end of the basal third, a very 

 large dark roundish patch in and below the marginal cell, and the tip dusky, 

 a round area between the dusky tip and the large dark region appearing white. 

 General structure of body normal, the abdomen sessile, with the first segment, seen 

 in lateral profile, ascending and convex ; spurs large ; antennae about 7 mm. long, 

 one curled under body reaching middle coxae, apparently not curled, or little 

 curled, at tip ; hind coxae long, hind femora about 3i mm. 



Length of stigma 900 (this and the following measurements in ju), its breadth 

 about 285 ; costal cell distinct ; length of marginal cell about 2400, long and nar- 

 row, its breadth about 525, its apex pointed and on costa ; distance from insertion 

 of third t. c. to tip of marginal, 765 ; length of first s. m. nearly 2250 ; first t. c. 

 bowed inwards (basad), its length about 525 ; stigma to insertion of first t. c, 270 ; 

 second s. m. on marginal, 750 ; third s. m. on marginal, 795 ; outer angle formed by 

 insertion of third t. c. on marginal less than a right angle ; distance from insertion 

 of second r. n. to lower apical corner of third s. m., 825 (the second r. n. enters 

 third s. m. toward the base); b. n. ven/ far basad of stigma, and its origin 450 

 basad of t. m., its lower section about 600 long, tlie upper one (bounding first s. m.) 

 considerably less ; lower edge of second discoidal 1275 long, its breadth at apex 



