266 PROCEEDINGS OF THE ACADEMY OF [1895. 



Tennessee (Handlirsch) ; Arkansas (Say); Missouri (Riley); 

 Texas; New Mexico (Cockerell); Utah; Nevada; Washington. 

 Handlirsch considers grandis and fervidus as distinct species, hut the 

 distinguishing characters given by him, (the coloration and sculpture 

 of thorax ahove) are shown to he variable by a series of twenty-three 

 examples before me, and the color of the wings is not constant. 



STIZUS Latr. 



Stizus Latreille, Histoire naturelle, III, 344, 1802. 

 Bicyrtes Lepeletier de St. Fargeau, Hym., Ill, p. 53, 1845. 

 Bembecinus Costa, Fauna del Regno di Napoli, 4, 1859. 

 Larra Smith (non Fabr.) Cat. Hym. B. M., IV, p. 337. 

 Megastizus Patton, Bull. IT. S. Geol. Survey, V, p. 334, 1879. 



FEMALES. 



Middle segment emargiuate posteriorly at the sides; females . 2 



Middle segment not emargiuate, the postero-lateral angles 



rounded 4 



2 — Second submarginal cell distinctly petiolate 3 



Second submarginal cell not petiolate, but the first and second 

 transverso-cubital nervures touch at the marginal cell; space 

 between hind ocelli slightly greater than that between them 

 and nearest eye margin; antennae placed at a distinctly greater 

 distance from the clypeus than from the eyes; black, with yel- 

 low maculatious, the greater part of coxa?, trochanters, tibise 

 and the tarsi entirely, yellow; legs robust neglect us. 



3 — Antenme placed at about the same distance from clypeus as from 

 the eyes; space between hind ocelli just about equal to that be- 

 tween them and nearest eye margin ; not densely hirsute; tibia? 

 only in part yellow; hind tarsi entirely black . . . Godmani. 

 Antenna? placed somewhat farther away from the clypeus than 

 from eye margin; space between hind ocelli greater than that 

 between them and nearest eye margin; rather densely hirsute; 

 tibise and tarsi entirely yellow nanus. 



4 — First and second transverso-cubital nervures widely separated 



above. Size very large 5 



First and second transverso-cubital nervures narrowly separated 

 or meeting at the marginal cell; deep black, the second dorsal 

 abdominal segment with a broad, reddish fascia, sometimes in- 

 terrupted medially, but rarely absent; wings blue-black, the 

 apical margin of anteriors whitish unicinctus. 



5 — Yellowish spots on dorsal abdominal segments 3 and 4 extended 

 so that they nearly meet internally; clypeus hardly as broad as 

 the combined length of the first three antennal joints united, 

 its anterior margin rather strongly incurved; lateral ridges of 

 pygidial area fully twice as long as the latter is broad at apex. 

 brevipennis. 



