510 APID.I. 



b'. Over 11 mm. long. 



a^. Apical margin of clypeus with fulvous 



pubescence C. basalis, p. 613. 



b^. Apical margin of clypeus -svitli white 

 pubescence. 



a^. Tarsi with golden pubescence C. sexmacidatus, p. 513. 



b^. Tarsi with white pubescence. 



a*. Dorsal and ventral plates of apical 

 abdominal segment equal or 



nearly equal C. cuneatus, p. 514. 



b^. Dorsal plate of apical abdominal 

 segment much shorter than ven- 

 tral plate C. confusus, p. 514, 



Males. 



A. Apical abdominal segment furnished with 



4 spinous teeth. 



a. Length 7 mm C. minutus, p. 512. 



b. Length 11 mm C. cuneatus, p. 514. 



e. Length 14 mm C. argentifrons, p. 515, 



B. Apical abdominal segment with 6 spinous 



teeth. 



a. Scutellum comparatively long, narrowly 



arched, subangular posteriorly C. decijnens, p, 510. 



b. Scutellum comparatively short, broadly 



arched posteriorly C. confusus, p. 514. 



C. Apical abdominal segment with 8 spinous teeth. 



rt. Length 6'5 mm C. capitntus, p. 512. 



b. Length 13 mm C. basalis, p. 513, 



900. Coelioxys decipiens. (PI. IV, fig. 1.) 



Spin. Ann. Soc. E7it. Fr. vii, 1838, p. 532, 5 S; Dall Torr. Cat. 

 X, p. 485. 

 Coelioxys apicata, Smith, Cat. ii, p. 267, 



2 . Head and thorax closely and finely, abdomen more minutely 

 and densely punctured ; clypeus convex, transverse anteriorly, the 

 lower lateral angles slightly produced ; scutellum with a strong 

 triangular lateral tooth, its posterior margin narrowly arched, 

 almost angular in the middle ; abdomen with the base of the 2nd 

 and following segments slightly depressed ; the dorsal plate of the 

 apical segment constricted towards the apex and sharply carinate 

 down the middle, the ventral plate broad spoon-shaped and 

 rounded at apex, which projects well beyond the apex of the 

 dorsal plate. Black ; the clypeus, the face to a little above the 

 base of the antennae, the cheeks and occiput, the sides of the 

 thorax, and the apical margins of abdominal segments 1-5 nar- 

 rowly covered with snow^-white pubescence ; these marginal bands 

 not or scarcely widened laterally ; wings hyaline at base, sub- 

 fuscous for half their length at apex. 



S similar, smaller; the 3rd abdominal segment above with 

 deeply marked lateral transverse sulcations, the hollows covered 

 with white pile ; the apical segment deeply indented at apex and 



